No abstract available.
","language":"English","publisher":"Springer","doi":"10.1007/BF00276311","usgsCitation":"Nichols, J., Hestbeck, J., and Conley, W., 1979, Mathematical models and population cycles: A critical evaluation of a recent modeling effort: Journal of Mathematical Biology, v. 8, no. 3, p. 259-263, https://doi.org/10.1007/BF00276311.","productDescription":"5 p.","startPage":"259","endPage":"263","numberOfPages":"5","costCenters":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":197565,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"8","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a27e4b07f02db60ffe4","contributors":{"authors":[{"text":"Nichols, J.D. 0000-0002-7631-2890","orcid":"https://orcid.org/0000-0002-7631-2890","contributorId":14332,"corporation":false,"usgs":true,"family":"Nichols","given":"J.D.","affiliations":[],"preferred":false,"id":336366,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Hestbeck, J.B.","contributorId":107802,"corporation":false,"usgs":true,"family":"Hestbeck","given":"J.B.","affiliations":[],"preferred":false,"id":336368,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Conley, W.","contributorId":76848,"corporation":false,"usgs":true,"family":"Conley","given":"W.","email":"","affiliations":[],"preferred":false,"id":336367,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":5211356,"text":"5211356 - 1979 - Seasonal occurrence and distribution of submerged aquatic macrophytes in the tidal Potomac River","interactions":[],"lastModifiedDate":"2019-07-29T12:00:34","indexId":"5211356","displayToPublicDate":"2009-06-09T09:23:19","publicationYear":"1979","noYear":false,"publicationType":{"id":5,"text":"Book chapter"},"publicationSubtype":{"id":24,"text":"Book Chapter"},"title":"Seasonal occurrence and distribution of submerged aquatic macrophytes in the tidal Potomac River","docAbstract":"A systematic survey was conducted in the Tidal Potomac River in 1978 to determine the presence, abundance, and phenology of submersed aquatic macrophytes. The survey covered 81.5 km of main river and 59.3 km of tributary on the Maryland shore. Four regions were selected for the study: (1) Piscataway - Mattawoman Creek region (fresh-tidal river), (2) Nanjemoy Creek-Port Tobacco River region (transition zone), (3) Wicomico River region (estuary), and (4) St. Marys River region (estuary). The Wicomico River region was subdivided into fresh tidal river, transition zone and estuary for purposes of date analysis. Data were gathered by sampling each 15 m along transects running perpendicular to shore for a maximum distance of 300 m. Modified oyster tongs were used to sample both plants and benthic soils from an outboard boat. A total of 131 transects were established with a total of approximately 3500 grabs being taken per sampling period. Sampling was initiated in the spring and repeated in the summer and fall. Highest plant diversity and productivity were measured in the transition zone extending from Lower Cedar Point to beyond Maryland Point, a distance of approximately 30 km, and in the transition zone of the Wicomico River above Chaptico Bay. Fresh tidal areas were devoid of plants. The estuary had a sparse growth of horned pondweed (Zannichellia palustris) and widgeon grass (Ruppia maritima) in the spring: horned pondweed was not found in summer or fall. Redhead grass (Potomageton perfoliatus) was the most abundant pondweed; it matured in early summer and died back in mid-to-late summer. Wild celery (Vallisneria americana) and widgeon grass matured in early-to-late fall and were the most abundant plants during that period. Data analysis is being finalized and a publication is in preparation. This research will be continued over the next several seasons as part of the long term USGS effort on the Potomac","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Seminar on water quality in the tidal Potomac River, December 1978","largerWorkSubtype":{"id":4,"text":"Other Government Series"},"language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, Va.","usgsCitation":"Haramis, G., Carter, V., Gammon, P., and Hupp, C., 1979, Seasonal occurrence and distribution of submerged aquatic macrophytes in the tidal Potomac River, chap. of Seminar on water quality in the tidal Potomac River, December 1978.","productDescription":"21","startPage":"19 (abs)","numberOfPages":"21","costCenters":[{"id":436,"text":"National Research Program - Eastern Branch","active":true,"usgs":true},{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":200844,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4adbe4b07f02db685e32","contributors":{"authors":[{"text":"Haramis, G.M.","contributorId":101212,"corporation":false,"usgs":true,"family":"Haramis","given":"G.M.","email":"","affiliations":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"preferred":false,"id":330835,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Carter, V.","contributorId":61115,"corporation":false,"usgs":true,"family":"Carter","given":"V.","email":"","affiliations":[],"preferred":false,"id":330833,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Gammon, P.","contributorId":68861,"corporation":false,"usgs":true,"family":"Gammon","given":"P.","affiliations":[],"preferred":false,"id":330834,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Hupp, C. 0000-0003-1853-9197","orcid":"https://orcid.org/0000-0003-1853-9197","contributorId":59150,"corporation":false,"usgs":true,"family":"Hupp","given":"C.","affiliations":[],"preferred":false,"id":330832,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":5210116,"text":"5210116 - 1979 - Bird communities associated with succession and management of lowland conifer forests","interactions":[],"lastModifiedDate":"2012-02-02T00:15:17","indexId":"5210116","displayToPublicDate":"2009-06-09T09:23:16","publicationYear":"1979","noYear":false,"publicationType":{"id":5,"text":"Book chapter"},"publicationSubtype":{"id":24,"text":"Book Chapter"},"title":"Bird communities associated with succession and management of lowland conifer forests","docAbstract":"Data from published bird censuses were used to determine changes in avian communities in relation to plant succession, fire, type conversion, and timber management practices in lowland conifer forests in the northeastern United States. With modifications in current logging practices, habitat for the bird species that nest in undisturbed stands can be provided. Management guidelines are recommended.","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Management of North Central and Northeastern Forests for Nongame Birds, Proceedings of the Workshop","largerWorkSubtype":{"id":4,"text":"Other Government Series"},"language":"English","publisher":"North Central Forest Experiment Station, U.S. Forest Service","publisherLocation":"St. Paul, MN","collaboration":" PDF on file: 2195_Dawson.pdf","usgsCitation":"Dawson, D., 1979, Bird communities associated with succession and management of lowland conifer forests, chap. of Management of North Central and Northeastern Forests for Nongame Birds, Proceedings of the Workshop, p. 120-131.","productDescription":"268","startPage":"120","endPage":"131","numberOfPages":"268","costCenters":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":201184,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a28e4b07f02db611363","contributors":{"authors":[{"text":"Dawson, D.K. 0000-0001-7531-212X","orcid":"https://orcid.org/0000-0001-7531-212X","contributorId":94752,"corporation":false,"usgs":true,"family":"Dawson","given":"D.K.","affiliations":[],"preferred":false,"id":327810,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70012531,"text":"70012531 - 1979 - A radiographic scanning technique for cores","interactions":[],"lastModifiedDate":"2025-04-18T15:32:23.758193","indexId":"70012531","displayToPublicDate":"2003-04-15T00:00:00","publicationYear":"1979","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2667,"text":"Marine Geology","active":true,"publicationSubtype":{"id":10}},"title":"A radiographic scanning technique for cores","docAbstract":"A radiographic scanning technique (RST) can produce single continuous radiographs of cores or core sections up to 1.5 m long and up to 30 cm wide. Changing a portable industrial X-ray unit from the normal still-shot mode to a scanning mode requires simple, inexpensive, easily constructed, and highly durable equipment. Additional components include a conveyor system, antiscatter cylinder-diaphragm, adjustable sample platform, developing tanks, and a contact printer. Complete cores, half cores, sample slabs or peels may be scanned. Converting the X-ray unit from one mode to another is easy and can be accomplished without the use of special tools. RST provides the investigator with a convenient, continuous, high quality radiograph, saves time and money, and decreases the number of times cores have to be handled.
","language":"English","publisher":"Elsevier","doi":"10.1016/0025-3227(79)90104-X","issn":"00253227","usgsCitation":"Hill, G.W., Dorsey, M., Woods, J., and Miller, R.J., 1979, A radiographic scanning technique for cores: Marine Geology, v. 29, no. 1-4, p. 93-106, https://doi.org/10.1016/0025-3227(79)90104-X.","productDescription":"14 p.","startPage":"93","endPage":"106","costCenters":[],"links":[{"id":221829,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"29","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059e528e4b0c8380cd46b80","contributors":{"authors":[{"text":"Hill, G. W.","contributorId":85551,"corporation":false,"usgs":true,"family":"Hill","given":"G.","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":363833,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Dorsey, M.E.","contributorId":73997,"corporation":false,"usgs":true,"family":"Dorsey","given":"M.E.","email":"","affiliations":[],"preferred":false,"id":363832,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Woods, J.C.","contributorId":93770,"corporation":false,"usgs":true,"family":"Woods","given":"J.C.","email":"","affiliations":[],"preferred":false,"id":363834,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Miller, R. J.","contributorId":9225,"corporation":false,"usgs":true,"family":"Miller","given":"R.","middleInitial":"J.","affiliations":[],"preferred":false,"id":363831,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70012515,"text":"70012515 - 1979 - Small-scale slump deposits, Middle Atlantic Continental Slope, off eastern United States","interactions":[],"lastModifiedDate":"2025-04-18T15:29:03.341509","indexId":"70012515","displayToPublicDate":"2003-04-15T00:00:00","publicationYear":"1979","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2667,"text":"Marine Geology","active":true,"publicationSubtype":{"id":10}},"title":"Small-scale slump deposits, Middle Atlantic Continental Slope, off eastern United States","docAbstract":"Analyses of 24 high-resolution seismic-reflection profiles that were collected during local and regional surveys show that small-scale slump deposite are ubiquitous whthin the intercanyon areas of the Continental Slope of the Middle Atlantic Bight. The deposits involve the upper 10-90 m of sediments, extend downslops for 1.8-7.2 km, and are present at water depths ranging from 545 to 1500 m. The characteristics of the deposits vary from thin, homogeneous or fairly regularly bedded lenses of sediment, to masses of intermediate thickness with contorted bedding, to relatively large slump blocks. A detailed survey of one slump mass just south of Hudson Canyon (by means of close-spaced Minisparker profiles and sediment cores) showed that it had a thickness of about 30 m and a volume of at least 0.4 km3 and consisted of homogeneous clay which accumulated rapidly during the late Pleistocene or Holocene. Although some of the slump deposits undoubtedly are relict, stemming from sediment instability porduced by rapid deposition during Pleistocene sea-level regressions, others were formed relatively recently. Possible causes of modern slumps include gas generation in the sediments, bottom-water turbulence on the upper slope, and shallow faulting. This study indicates that small-scale slumping in the intercanyon areas may be an important process in transporting sediments to the deep sea and suggests that recent mass movements may constitute a geologic hazard to future economic development of this part of the Continental Slope.
","language":"English","publisher":"Elsevier","doi":"10.1016/0025-3227(79)90110-5","issn":"00253227","usgsCitation":"Knebes, H., and Carson, B., 1979, Small-scale slump deposits, Middle Atlantic Continental Slope, off eastern United States: Marine Geology, v. 29, no. 1-4, p. 221-236, https://doi.org/10.1016/0025-3227(79)90110-5.","productDescription":"16 p.","startPage":"221","endPage":"236","costCenters":[],"links":[{"id":222542,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","otherGeospatial":"Middle Atlantic Bight","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -73.88771708896576,\n 40.263326615601756\n ],\n [\n -74.45922882846764,\n 38.633058616550365\n ],\n [\n -75.58169389106907,\n 37.103688088321874\n ],\n [\n -72.89701653441095,\n 36.7128742895589\n ],\n [\n -71.92570445520803,\n 40.263326615601756\n ],\n [\n -73.88771708896576,\n 40.263326615601756\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"29","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b919ae4b08c986b3199c1","contributors":{"authors":[{"text":"Knebes, H.J.","contributorId":19291,"corporation":false,"usgs":true,"family":"Knebes","given":"H.J.","email":"","affiliations":[],"preferred":false,"id":363796,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Carson, Bobb","contributorId":38285,"corporation":false,"usgs":false,"family":"Carson","given":"Bobb","email":"","affiliations":[],"preferred":false,"id":363797,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70010363,"text":"70010363 - 1979 - Volcanic ash in surficial sediments of the Kodiak shelf - An indicator of sediment dispersal patterns","interactions":[],"lastModifiedDate":"2025-04-18T15:22:38.899818","indexId":"70010363","displayToPublicDate":"2003-04-15T00:00:00","publicationYear":"1979","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2667,"text":"Marine Geology","active":true,"publicationSubtype":{"id":10}},"title":"Volcanic ash in surficial sediments of the Kodiak shelf - An indicator of sediment dispersal patterns","docAbstract":"Surficial sediments of the Kodiak shelf, Gulf of Alaska, contain various amounts of volcanic ash whose physical properties indicate that it originated from the 1912 Katmai eruption. The distribution of ash is related to the shelf physiography and represents redistribution by oceanic circulation rather than the original depositional pattern from the volcanic event. The ash distribution can be used, in conjunction with the distribution of grain sizes, as an indicator of present-day sediment dispersal patterns on the shelf.
No significant modern input of sediment is occurring on the Kodiak shelf, which is mostly covered by Pleistocene glacial deposits. Coarse-grained sediments on flat portions of shallow banks apparently are being winnowed, with the removed ash-rich fine material being deposited in shallow depressions on the banks and in three of the four major troughs that cut transversely across the shelf. The other major trough seems to be experiencing a relatively high-energy current regime, with little deposition of fine material.
","language":"English","publisher":"Elsevier","doi":"10.1016/0025-3227(79)90116-6","issn":"00253227","usgsCitation":"Hampton, M.A., Bouma, A., Frost, T.P., and Colburn, I., 1979, Volcanic ash in surficial sediments of the Kodiak shelf - An indicator of sediment dispersal patterns: Marine Geology, v. 29, no. 1-4, p. 347-356, https://doi.org/10.1016/0025-3227(79)90116-6.","productDescription":"10 p.","startPage":"347","endPage":"356","costCenters":[],"links":[{"id":219607,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Alaska","otherGeospatial":"Gulf of Alaska","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -152.77885686791024,\n 58.70887118983768\n ],\n [\n -155.20719455555994,\n 57.35461098142929\n ],\n [\n -155.9976310121188,\n 56.55327620870899\n ],\n [\n -156.26272200519873,\n 55.610227263713085\n ],\n [\n -154.82178121895734,\n 55.58509738304019\n ],\n [\n -153.40627687529198,\n 55.78507738124526\n ],\n [\n -150.97088483528586,\n 56.68651666089394\n ],\n [\n -150.97088483528586,\n 58.67739554234353\n ],\n [\n -152.77885686791024,\n 58.70887118983768\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"29","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bc2dfe4b08c986b32ae07","contributors":{"authors":[{"text":"Hampton, M. A.","contributorId":103271,"corporation":false,"usgs":true,"family":"Hampton","given":"M.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":358725,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bouma, A.H.","contributorId":107281,"corporation":false,"usgs":true,"family":"Bouma","given":"A.H.","email":"","affiliations":[],"preferred":false,"id":358726,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Frost, T. P.","contributorId":49797,"corporation":false,"usgs":true,"family":"Frost","given":"T.","email":"","middleInitial":"P.","affiliations":[],"preferred":false,"id":358723,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Colburn, I.P.","contributorId":89009,"corporation":false,"usgs":true,"family":"Colburn","given":"I.P.","email":"","affiliations":[],"preferred":false,"id":358724,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70012497,"text":"70012497 - 1979 - On the mechanical interaction between a fluid-filled fracture and the earth's surface","interactions":[],"lastModifiedDate":"2025-09-03T16:29:35.625949","indexId":"70012497","displayToPublicDate":"2003-04-11T00:00:00","publicationYear":"1979","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3525,"text":"Tectonophysics","active":true,"publicationSubtype":{"id":10}},"title":"On the mechanical interaction between a fluid-filled fracture and the earth's surface","docAbstract":"Episodic slip on shallow crustal faults can be qualitatively explained by postulating a fault constitutive law that is the superposition of two limiting material responses: (1) strain softening after peak stress during large strain rates, and (2) strength (peak stress) recovery during aging at small strain rates. A single law permits a variety of seismic and aseismic phenomena to occur over a range of space and time scales. Specific cases are determined by the spatial variation of material constants, recent deformation history, crustal rigidity, and remote forcing.
","language":"English","publisher":"Elsevier","doi":"10.1016/0040-1951(79)90280-4","issn":"00401951","usgsCitation":"Stuart, W.D., 1979, Aging and strain softening model for episodic faulting: Tectonophysics, v. 52, no. 1-4, p. 613-626, https://doi.org/10.1016/0040-1951(79)90280-4.","productDescription":"14 p.","startPage":"613","endPage":"626","costCenters":[],"links":[{"id":222358,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"52","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059e90ce4b0c8380cd4806f","contributors":{"authors":[{"text":"Stuart, William D. stuart@usgs.gov","contributorId":3223,"corporation":false,"usgs":true,"family":"Stuart","given":"William","email":"stuart@usgs.gov","middleInitial":"D.","affiliations":[],"preferred":true,"id":363767,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70012412,"text":"70012412 - 1979 - Vertical crustal movements in the Charleston, South Carolina-Savannah, Georgia area","interactions":[],"lastModifiedDate":"2025-09-05T16:31:15.061746","indexId":"70012412","displayToPublicDate":"2003-04-09T00:00:00","publicationYear":"1979","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3525,"text":"Tectonophysics","active":true,"publicationSubtype":{"id":10}},"title":"Vertical crustal movements in the Charleston, South Carolina-Savannah, Georgia area","docAbstract":"First-order vertical level surveys (National Geodetic Survey) repeated between 1955 and 1975 suggest that modern vertical crustal movements have taken place in the Atlantic Coastal Plain between Charleston, South Carolina and Savannah, Georgia. The relative sense of these movements correlates with the sense of displacement of Tertiary strata on known geologic structures. Whereas regional dip of strata in most of the Atlantic Coastal Plain is southeasterly, the regional dip of Tertiary strata in this part of the Coastal Plain averages 2 m/km to the south or southwest. Positive structural features disturb this regional dip along a poorly defined zone, about 25 km wide, parallel to the coast between Savannah and Charleston. Structural relief on these features is as much as 20 m. Repeated level lines that cross the Atlantic Coastal Plain elsewhere generally show an increase in modern relative subsidence from west to east. However, in the Charleston—Savannah area, the amount of relative subsidence remains fairly constant or decreases from west to east across the structural highs. At two localities near Charleston, where Tertiary beds are offset by faults roughly on strike with one another, an abrupt break in a repeated level line occurs where the level line crosses the probable extensions of these faults. The average modern rates of relative uplift and subsidence (assuming they are constant) are compatible with rates noted throughout the Coastal Plain. Long-term extrapolation of modern rates appears unreasonable; episodic or oscillatory movements are much more likely.
","language":"English","publisher":"Elsevier","doi":"10.1016/0040-1951(79)90223-3","issn":"00401951","usgsCitation":"Lyttle, P.T., Gohn, G., Higgins, B., and Wright, D., 1979, Vertical crustal movements in the Charleston, South Carolina-Savannah, Georgia area: Tectonophysics, v. 52, no. 1-4, p. 183-189, https://doi.org/10.1016/0040-1951(79)90223-3.","productDescription":"7 p.","startPage":"183","endPage":"189","costCenters":[],"links":[{"id":221822,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Georgia, South Carolina","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -81.89939091011503,\n 33.56449440727431\n ],\n [\n -81.89939091011503,\n 31.94598797126214\n ],\n [\n -79.42308747915132,\n 31.94598797126214\n ],\n [\n -79.42308747915132,\n 33.56449440727431\n ],\n [\n -81.89939091011503,\n 33.56449440727431\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"52","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bc22fe4b08c986b32a9a2","contributors":{"authors":[{"text":"Lyttle, Peter T.","contributorId":244786,"corporation":false,"usgs":false,"family":"Lyttle","given":"Peter","email":"","middleInitial":"T.","affiliations":[{"id":7065,"text":"USGS emeritus","active":true,"usgs":false}],"preferred":false,"id":363478,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Gohn, Gregory S. ggohn@usgs.gov","contributorId":147414,"corporation":false,"usgs":true,"family":"Gohn","given":"Gregory S.","email":"ggohn@usgs.gov","affiliations":[{"id":243,"text":"Eastern Geology and Paleoclimate Science Center","active":true,"usgs":true}],"preferred":false,"id":363476,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Higgins, Brenda","contributorId":106106,"corporation":false,"usgs":true,"family":"Higgins","given":"Brenda","email":"","affiliations":[],"preferred":false,"id":363475,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Wright, D.S.","contributorId":56799,"corporation":false,"usgs":true,"family":"Wright","given":"D.S.","email":"","affiliations":[],"preferred":false,"id":363477,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70010362,"text":"70010362 - 1979 - Elastic expansion of the lithosphere caused by groundwater withdrawal in south-central Arizona","interactions":[],"lastModifiedDate":"2025-09-04T16:51:35.160881","indexId":"70010362","displayToPublicDate":"2003-04-09T00:00:00","publicationYear":"1979","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3525,"text":"Tectonophysics","active":true,"publicationSubtype":{"id":10}},"title":"Elastic expansion of the lithosphere caused by groundwater withdrawal in south-central Arizona","docAbstract":"Relative crustal uplift observed from 1948–1949 to 1967 in the Lower Santa Cruz River Basin in south-central Arizona is attributed at least in part to elastic expansion of the lithosphere induced by the removal, and subsequent loss by evapo transpiration, of 4.35 × 1013 kg of groundwater from alluvium. The area of unloading is approximately 8070 km2. Uplift, relative to an apparently stable area west of the unloaded area, was observed in two areas near Casa Grande and Florence where crystalline bedrock is either close to the land surface or crops out through alluvium from which groundwater was withdrawn. The magnitudes of uplift were approximately 6.3 and 7.5 cm respectively. The observations are based on first-order leveling. The observations are significant at three standard deviations for random surveying errors, and are not believed to be affected by systematic errors. However, the 7.5-cm uplift observed at Florence may be from 1 to 2 cm in excess of the actual uplift because of the possibility of subsidence of a tie point due to groundwater pumping during the leveling in 1948–1949.
Uplift is attributed to groundwater withdrawal on three bases. First, the observed uplift is consistent with a theoretical evaluation of elastic expansion based on linear elasticity theory. For the observed distribution of unloading and uplift and a Poisson's ratio of 0.25, a Young's modulus for the lithosphere of approximately 0.68 Mbar is implied. This value is comparable to values of the lithosphere reported elsewhere. Second, the magnitude of uplift compares favorably with the magnitude of elastic depression caused by the formation of Lake Mead, Arizona—Nevada, 430 km northwest of the study area, when allowance is made for the different magnitudes and areal distributions of surface (un)loading. And third, in the area near Casa Grande, a reversal in the sense of bedrock displacement form subsidence of tectonic origin to uplift approximately coincided with the beginning of large groundwater overdraft. The uplift from 1948 to 1967 near Casa Grande was preceded from 1905 to 1948 by 7–8 cm of tectonic subsidence; no precise data for the area near Florence are available before 1948.
","language":"English","publisher":"Elsevier","doi":"10.1016/0040-1951(79)90236-1","issn":"00401951","usgsCitation":"Holzer, T., 1979, Elastic expansion of the lithosphere caused by groundwater withdrawal in south-central Arizona: Tectonophysics, v. 52, no. 1-4, p. 304-304, https://doi.org/10.1016/0040-1951(79)90236-1.","productDescription":"1 p.","startPage":"304","endPage":"304","costCenters":[],"links":[{"id":219606,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Arizona","otherGeospatial":"south-central Arizona","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -113.03416166288255,\n 33.907867445210215\n ],\n [\n -113.03416166288255,\n 31.331659801949186\n ],\n [\n -110.66198484870762,\n 31.331659801949186\n ],\n [\n -110.66198484870762,\n 33.907867445210215\n ],\n [\n -113.03416166288255,\n 33.907867445210215\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"52","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a0881e4b0c8380cd51b4e","contributors":{"authors":[{"text":"Holzer, T.L.","contributorId":35739,"corporation":false,"usgs":true,"family":"Holzer","given":"T.L.","email":"","affiliations":[],"preferred":false,"id":358722,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70010323,"text":"70010323 - 1979 - Dislocation modeling of creep-related tilt changes","interactions":[],"lastModifiedDate":"2025-09-04T16:00:42.765558","indexId":"70010323","displayToPublicDate":"2003-04-09T00:00:00","publicationYear":"1979","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3525,"text":"Tectonophysics","active":true,"publicationSubtype":{"id":10}},"title":"Dislocation modeling of creep-related tilt changes","docAbstract":"A comparison of creepmeter records from nine sites along a 12-km segment of the Calaveras fault near Hollister, California and long-baseline strain changes for nine lines in the Hollister multiwavelength distance-measuring (MWDM) array has established that episodes of large-scale deformation both preceded and accompanied periods of creep activity monitored along the fault trace during 1976. A concept of episodic, deep-seated aseismic slip that contributes to loading and subsequent aseismic failure of shallow parts of the fault plane seems attractive, implying that the character of aseismic slip sensed along the surface trace may be restricted to a relatively shallow (~ 1-km) region on the fault plane. Preliminary results from simple dislocation models designed to test the concept demonstrate that extending the time-histories and amplitudes of creep events sensed along the fault trace to depths of up to 10 km on the fault plane cannot simulate adequately the character and amplitudes of large-scale episodic movements observed at points more than 1 km from the fault. Properties of a 2–3-km-thick layer of unconsolidated sediments present in Hollister Valley, combined with an essentially rigid-block behavior in buried basement blocks, might be employed in the formulation of more appropriate models that could predict patterns of shallow fault creep and large-scale displacements much more like those actually observed.
","language":"English","publisher":"Elsevier","doi":"10.1016/0040-1951(79)90263-4","issn":"00401951","usgsCitation":"Slater, L., and Burford, R.O., 1979, A comparison of long-baseline strain data and fault creep records obtained near Hollister, California: Tectonophysics, v. 52, no. 1-4, p. 481-496, https://doi.org/10.1016/0040-1951(79)90263-4.","productDescription":"16 p.","startPage":"481","endPage":"496","costCenters":[],"links":[{"id":222266,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"California","city":"Hollister","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -121.63417354009724,\n 37.03514059462465\n ],\n [\n -121.63417354009724,\n 36.70425231730185\n ],\n [\n -121.22588991098016,\n 36.70425231730185\n ],\n [\n -121.22588991098016,\n 37.03514059462465\n ],\n [\n -121.63417354009724,\n 37.03514059462465\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"52","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059e36ce4b0c8380cd45fe1","contributors":{"authors":[{"text":"Slater, L.E.","contributorId":35063,"corporation":false,"usgs":true,"family":"Slater","given":"L.E.","email":"","affiliations":[],"preferred":false,"id":364024,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Burford, Robert O.","contributorId":52560,"corporation":false,"usgs":true,"family":"Burford","given":"Robert","middleInitial":"O.","affiliations":[],"preferred":false,"id":364025,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70012504,"text":"70012504 - 1979 - Two areas of probable holocene deformation in southwestern Utah","interactions":[],"lastModifiedDate":"2025-09-04T16:18:27.471378","indexId":"70012504","displayToPublicDate":"2003-04-09T00:00:00","publicationYear":"1979","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3525,"text":"Tectonophysics","active":true,"publicationSubtype":{"id":10}},"title":"Two areas of probable holocene deformation in southwestern Utah","docAbstract":"Recent geologic studies in southwestern Utah indicate two areas of probable Holocene ground deformation.
1. (1) A narrow arm of Lake Bonneville is known to have extended southward into Escalante Valley as far as Lund, Utah. Remnants of weakly developed shoreline features, which we have recently found, suggest that Lake Bonnevile covered an area of about 800 km2 beyond its previously recognized limits near Lund. Shoreline elevations show a gradual increase from 1553 m near Lund to 1584 m at a point 50 km further southwest, representing a reversal of the pattern that would result from isostatic rebound. The conspicuously flat floor of Escalante Valley covers an additional 100 km2 southward toward Enterprise, where its elevation is greater than 1610 m, but no shoreline features are recognizable; therefore, the former presence of the lake is only suspected. The measured 31-m rise over 50 km and the suspected 57-m rise in elevation over 70 km apparently occurred after Lake Bonnevile abandoned this area. The abandonment could have occurred as recently as 13,000 years ago, in which case the uplift is mainly of Holocene age. It probably has a deep-seated tectonic origin because it is situated above an inferred 9-km upwarp of the mantle that has been reported beneath the southern part of Escalante Valley on the basis of teleseismic P-wave residuals.
2. (2) Numerous closed topographic basins, ranging from a few hundred square meters to 1 km2 in area, are found at various elevations along the west margin of the Colorado Plateau northeast of Cedar City. Geologic mapping in that area indicates that the basins are located over complex structural depressions in which the rocks are faulted and folded. Several of the depressions are perched along the walls of the West Fork of Braffits Creek, one of a few north-draining creeks that have incised deeply into the plateau margin. Extremely active modern erosion by the creek has produced a 6-km-long gorge along which excellent exposures provide good evidence that the topographic depressions, as well as the entire valley, are located over a north-trending structural graben in which rocks of Cretaceous, Tertiary, and Quaternary age are complexly deformed. The trough appears to be actively subsiding, as evidenced by inward-dipping youthful scarps and V-shaped trenches found along both walls of the valley. The scarp on the east side is continuous for 1.5 km, and that on the west is discontinuous for the same distance. Charcoal-bearing alluvium from a sequence of faulted sedimentary debris in the inner gorge has yielded discordant dates by the 14C technique, but the dates suggest that at least 6 m of fault displacement occurred during the Late Holocene.
","language":"English","publisher":"Elsevier","doi":"10.1016/0040-1951(79)90257-9","issn":"00401951","usgsCitation":"Anderson, R., and Bucknam, R., 1979, Two areas of probable holocene deformation in southwestern Utah: Tectonophysics, v. 52, no. 1-4, p. 417-430, https://doi.org/10.1016/0040-1951(79)90257-9.","productDescription":"14 p.","startPage":"417","endPage":"430","costCenters":[],"links":[{"id":222419,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Utah","otherGeospatial":"southwestern Utah","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -112.13988686177788,\n 38.76852920061029\n ],\n [\n -112.13988686177788,\n 36.95389428410948\n ],\n [\n -109.0304136471782,\n 36.95389428410948\n ],\n [\n -109.0304136471782,\n 38.76852920061029\n ],\n [\n -112.13988686177788,\n 38.76852920061029\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"52","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bb94be4b08c986b327baf","contributors":{"authors":[{"text":"Anderson, R.E.","contributorId":91479,"corporation":false,"usgs":true,"family":"Anderson","given":"R.E.","email":"","affiliations":[],"preferred":false,"id":363772,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bucknam, R.C.","contributorId":35744,"corporation":false,"usgs":true,"family":"Bucknam","given":"R.C.","affiliations":[],"preferred":false,"id":363771,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70010440,"text":"70010440 - 1979 - Changes in rate of fault creep","interactions":[],"lastModifiedDate":"2025-09-04T16:06:32.354124","indexId":"70010440","displayToPublicDate":"2003-04-09T00:00:00","publicationYear":"1979","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3525,"text":"Tectonophysics","active":true,"publicationSubtype":{"id":10}},"title":"Changes in rate of fault creep","docAbstract":"Aseismic slip or fault creep is occurring on many faults in California. Although the creep rates are generally less than 10 mm/yr in most regions, the maximum observed rate along the San Andreas fault between San Juan Bautista and Gold Hill in central California exceeds 30 mm/yr. Changes in slip rates along a 162 km segment of the San Andreas fault in this region have occurred at approximately the same time at up to nine alinement array sites. Rates of creep on the fault near the epicenters of moderate earthquakes (ML 4–6) vary for periods of several years, decreasing before the main shocks and increasing thereafter, in agreement with prior observations based on creepmeter results. The change of surface slip rate is most pronounced within the epicentral region defined by aftershocks, but records from sites at distances up to 100 km show similar variations. Additionally, some variations in rate, also apparently consistent among many sites, have a less obvious relation with seismic activity and have usually taken place over shorter periods. Not all sites exhibit a significant variation in rate at the time of a regional change, and the amplitudes of the change at nearby sites are not consistently related. The time intervals between measurements at the nine array sites during a given period have not always been short with respect to the intervals between surveys at one site; hence, uneven sampling intervals may bias the results slightly. Anomalies in creep rates thus far observed, therefore, have not been demonstrably consistent precursors to moderate earthquakes; and in the cases when an earthquake has followed a long period change of rate, the anomaly has not specified time, place, or magnitude with a high degree of certainty. The consistency of rate changes may represent a large scale phenomenon that occurs along much of the San Andreas transform plate boundary.
","language":"English","publisher":"Elsevier","doi":"10.1016/0040-1951(79)90266-X","issn":"00401951","usgsCitation":"Harsh, P., 1979, Changes in rate of fault creep: Tectonophysics, v. 52, no. 1-4, p. 519-519, https://doi.org/10.1016/0040-1951(79)90266-X.","productDescription":"1 p.","startPage":"519","endPage":"519","costCenters":[],"links":[{"id":218647,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"California","otherGeospatial":"San Andreas fault","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -123.49111683709873,\n 41.23845484514334\n ],\n [\n -121.22954609997186,\n 37.147723728935766\n ],\n [\n -117.44018054284913,\n 33.754578338292035\n ],\n [\n -116.1951646206461,\n 33.81034080556368\n ],\n [\n -119.83129934259983,\n 37.519569891913555\n ],\n [\n -122.23061585176441,\n 41.35680615153203\n ],\n [\n -123.49111683709873,\n 41.23845484514334\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"52","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059f421e4b0c8380cd4bb6f","contributors":{"authors":[{"text":"Harsh, P.","contributorId":59175,"corporation":false,"usgs":true,"family":"Harsh","given":"P.","email":"","affiliations":[],"preferred":false,"id":358934,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70010377,"text":"70010377 - 1979 - Strain pattern represented by scarps formed during the earthquakes of October 2, 1915, Pleasant Valley, Nevada","interactions":[],"lastModifiedDate":"2025-09-04T15:43:41.678144","indexId":"70010377","displayToPublicDate":"2003-04-09T00:00:00","publicationYear":"1979","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3525,"text":"Tectonophysics","active":true,"publicationSubtype":{"id":10}},"title":"Strain pattern represented by scarps formed during the earthquakes of October 2, 1915, Pleasant Valley, Nevada","docAbstract":"The pattern of scarps developed during the earthquakes of October 2, 1915, in Pleasant Valley, Nevada, may have formed as a result of a modern stress system acting on a set of fractures produced by an earlier stress system which was oriented differently. Four major scarps developed in a right-stepping, en-echelon pattern suggestive of left-lateral slip across the zone and an extension axis oriented approximately S85°W. The trend of the zone is N25°E. However, the orientation of simple dip-slip on most segments trending approximately N20—40° E and a right-lateral component of displacement on several N- and NW-trending segments of the scarps indicate that the axis of regional extension was oriented between N50° and 70° W, normal to the zone.
The cumulative length of the scarps is 60 km, average vertical displacement 2 m, and the maximum vertical displacement near the Pearce School site 5.8 m. Almost everywhere the 1915 scarps formed along an older scarp line, and in some places older scarps represent multiple previous events. The most recent displacement event prior to 1915 is interpreted to have occurred more than 6600 years ago, but possibly less than 20,000 years ago. Some faults expressed by older scarps that trend northwest were not reactivated in 1915, possibly because they are oriented at a low angle with respect to the axis of modern regional extension.
The 1915 event occurred in an area of overlap of three regional fault trends oriented northwest, north, and northeast and referred to, respectively, as the Oregon—Nevada, Northwest Nevada, and Midas—Battle Moutain trends. Each of these trends may have developed at a different time; the Oregon—Nevada trend was possibly the earliest and developed in Late Miocene time (Stewart et al. 1975). Segments of the 1915 scarps ar
","language":"English","publisher":"Elsevier","doi":"10.1016/0040-1951(79)90274-9","issn":"00401951","usgsCitation":"Wallace, R.E., 1979, Strain pattern represented by scarps formed during the earthquakes of October 2, 1915, Pleasant Valley, Nevada: Tectonophysics, v. 52, no. 1-4, p. 599-599, https://doi.org/10.1016/0040-1951(79)90274-9.","productDescription":"1 p.","startPage":"599","endPage":"599","costCenters":[],"links":[{"id":218719,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Nevada","otherGeospatial":"Pleasant Valley","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -115.57276643805419,\n 40.752189211754455\n ],\n [\n -115.57276643805419,\n 40.68420641169672\n ],\n [\n -115.4573307107092,\n 40.68420641169672\n ],\n [\n -115.4573307107092,\n 40.752189211754455\n ],\n [\n -115.57276643805419,\n 40.752189211754455\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"52","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b9899e4b08c986b31c0c0","contributors":{"authors":[{"text":"Wallace, R. E.","contributorId":6823,"corporation":false,"usgs":true,"family":"Wallace","given":"R.","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":358777,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70012442,"text":"70012442 - 1979 - Monitoring massive fracture growth at 2-km depths using surface tiltmeter arrays","interactions":[],"lastModifiedDate":"2025-09-03T16:33:51.216118","indexId":"70012442","displayToPublicDate":"2003-04-09T00:00:00","publicationYear":"1979","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3525,"text":"Tectonophysics","active":true,"publicationSubtype":{"id":10}},"title":"Monitoring massive fracture growth at 2-km depths using surface tiltmeter arrays","docAbstract":"Tilt due to massive hydraulic fractures induced in sedimentary rocks at depths of up to 2.2 km have been recorded by surface tiltmeters. Injection of fluid volumes up to 4 · 105 liters and masses of propping agent up to 5 · 105 kg is designed to produce fractures approximately 1 km long, 50–100 m high and about 1 cm wide. The surface tilt data adequately fit a dislocation model of a tensional fault in a half-space. Theoretical and observational results indicate that maximum tilt occurs at a distance off the strike of the fracture equivalent to 0.4 of the depth to the fracture. Azimuth and extent of the fracture deduced from the geometry of the tilt field agree with other kinds of geophysical measurements. Detailed correlation of the tilt signatures with pumping parameters (pressure, rate, volume, mass) have provided details on asymmetry in geometry and growth rate. Whereas amplitude variations in tilt vary inversely with the square of the depth, changes in flow rate or pressure gradient can produce a cubic change in width. These studies offer a large-scale experimental approach to the study of problems involving fracturing, mass transport, and dilatancy processes.
","language":"English","publisher":"Elsevier","doi":"10.1016/0040-1951(79)90283-X","issn":"00401951","usgsCitation":"Wood, M., 1979, Monitoring massive fracture growth at 2-km depths using surface tiltmeter arrays: Tectonophysics, v. 52, no. 1-4, p. 643-643, https://doi.org/10.1016/0040-1951(79)90283-X.","productDescription":"1 p.","startPage":"643","endPage":"643","costCenters":[],"links":[{"id":222352,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"52","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a5dbee4b0c8380cd70582","contributors":{"authors":[{"text":"Wood, M.D.","contributorId":63930,"corporation":false,"usgs":true,"family":"Wood","given":"M.D.","email":"","affiliations":[],"preferred":false,"id":363592,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70012482,"text":"70012482 - 1979 - Early 20th-century uplift of the northern Peninsular Ranges province of southern California","interactions":[],"lastModifiedDate":"2025-09-05T16:19:29.965797","indexId":"70012482","displayToPublicDate":"2003-04-09T00:00:00","publicationYear":"1979","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3525,"text":"Tectonophysics","active":true,"publicationSubtype":{"id":10}},"title":"Early 20th-century uplift of the northern Peninsular Ranges province of southern California","docAbstract":"Repeated leveling in the northern Peninsular Ranges province identifies an early 20thcentury episode of crustal upwarping in southern California. The episodic vertical movement is broadly bracketed between 1897 and 1934, and the main deformation is bracketed within 1906–1914 and involved regional up-to-the-northeast tilting of the Santa Ana block of as much as 4 · 10−6 rad and elevation changes exceeding 0.4 m in the Perris block and parts of the San Jacinto block, Transverse Ranges, and the Mohave block. Primary tide station records containing occasional entries since 1853 at San Pedro and San Diego show no evidence of episodic crustal movement, suggesting that the uplifted area hinged along coastal fault zones forming the west boundary of the Santa Ana block.
Physiographic features and recent studies of Quaternary marine terraces by others show that this episode of regional tilting and uplift is a part of the continuing tectonic process in southern California. A crude, questionable coincidence exists between the uplift episode and a period of increased seismicity (1890–1923) in the northern Peninsular Ranges characterized by a number of moderate-size (M > 6) earthquakes on NW-trending strike-slip faults. However, releveling data are too sparse to associate the uplift development clearly with any one event.
","language":"English","publisher":"Elsevier","doi":"10.1016/0040-1951(79)90230-0","issn":"00401951","usgsCitation":"Wood, S.H., and Elliott, M.R., 1979, Early 20th-century uplift of the northern Peninsular Ranges province of southern California: Tectonophysics, v. 52, no. 1-4, p. 249-265, https://doi.org/10.1016/0040-1951(79)90230-0.","productDescription":"17 p.","startPage":"249","endPage":"265","costCenters":[],"links":[{"id":222082,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"California","otherGeospatial":"southern California","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -120.7291858900493,\n 35.46353030675584\n ],\n [\n -120.7291858900493,\n 32.603965801918534\n ],\n [\n -114.22074772045107,\n 32.603965801918534\n ],\n [\n -114.22074772045107,\n 35.46353030675584\n ],\n [\n -120.7291858900493,\n 35.46353030675584\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"52","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a0473e4b0c8380cd509c1","contributors":{"authors":[{"text":"Wood, Spencer H. 0000-0002-5794-2619","orcid":"https://orcid.org/0000-0002-5794-2619","contributorId":16111,"corporation":false,"usgs":false,"family":"Wood","given":"Spencer","email":"","middleInitial":"H.","affiliations":[{"id":6934,"text":"University of Washington","active":true,"usgs":false}],"preferred":false,"id":363723,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Elliott, Michael R.","contributorId":291274,"corporation":false,"usgs":false,"family":"Elliott","given":"Michael","middleInitial":"R.","affiliations":[{"id":62651,"text":"Department of Biological & Marine Sciences, University of Hull and International Estuarine & Coastal Specialists (IECS)","active":true,"usgs":false}],"preferred":false,"id":363722,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70012443,"text":"70012443 - 1979 - On radon emanation as a possible indicator of crustal deformation","interactions":[],"lastModifiedDate":"2025-09-05T16:34:33.043296","indexId":"70012443","displayToPublicDate":"2003-04-09T00:00:00","publicationYear":"1979","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3525,"text":"Tectonophysics","active":true,"publicationSubtype":{"id":10}},"title":"On radon emanation as a possible indicator of crustal deformation","docAbstract":"Radon emanation has been monitored in shallow capped holes by a Tracketch method along several active faults and in the vicinity of some volcanoes and underground nuclear explosions. The measured emanation shows large temporal variations that appear to be partly related to crustal strain changes. This paper proposes a model that may explain the observed tectonic variations in radon emanation, and explores the possibility of using radon emanation as an indicator of crustal deformation. In this model the emanation variation is assumed to be due to the perturbation of near-surface profile of radon concentration in the soil gas caused by a change in the vertical flow rate of the soil gas which, in turn, is caused by the crustal deformation. It is shown that, for a typical soil, a small change in the flow rate (3 · 10−4 cm sec−1) can effect a significant change (a factor of 2) in radon emanation detected at a fixed shallow depth (0.7 m). The radon concentration profile has been monitored at several depths at a selected site to test the model. The results appear to be in satisfactory agreement.
","language":"English","publisher":"Elsevier","doi":"10.1016/0040-1951(79)90215-4","issn":"00401951","usgsCitation":"King, C., 1979, On radon emanation as a possible indicator of crustal deformation: Tectonophysics, v. 52, no. 1-4, p. 120-120, https://doi.org/10.1016/0040-1951(79)90215-4.","productDescription":"1 p.","startPage":"120","endPage":"120","costCenters":[],"links":[{"id":222353,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"52","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a6da6e4b0c8380cd75252","contributors":{"authors":[{"text":"King, Chi-Yu","contributorId":74140,"corporation":false,"usgs":true,"family":"King","given":"Chi-Yu","affiliations":[],"preferred":false,"id":363593,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70012472,"text":"70012472 - 1979 - The gravity field of the U.S. Atlantic continental margin","interactions":[],"lastModifiedDate":"2025-09-03T16:06:30.132828","indexId":"70012472","displayToPublicDate":"2003-04-08T00:00:00","publicationYear":"1979","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3525,"text":"Tectonophysics","active":true,"publicationSubtype":{"id":10}},"title":"The gravity field of the U.S. Atlantic continental margin","docAbstract":"Approximately 39,000 km of marine gravity data collected during 1975 and 1976 have been integrated with U.S. Navy and other available data over the U.S. Atlantic continental margin between Florida and Maine to obtain a 10 mgal contour free-air gravity anomaly map. A maximum typically ranging from 0 to +70 mgal occurs along the edge of the shelf and Blake Plateau, while a minimum typically ranging from −20 to −80 mgal occurs along the base of the continental slope, except for a −140 mgal minimum at the base of the Blake Escarpment. Although the maximum and minimum free-air gravity values are strongly influenced by continental slope topography and by the abrupt change in crustal thickness across the margin, the peaks and troughs in the anomalies terminate abruptly at discrete transverse zones along the margin. These zones appear to mark major NW—SE fractures in the subsided continental margin and adjacent deep ocean basin, which separate the margin into a series of segmented basins and platforms. Rapid differential subsidence of crustal blocks on either side of these fractures during the early stages after separation of North America and Africa (Jurassic and Early Cretaceous) is inferred to be the cause of most of the gravity transitions along the length of margin. The major transverse zones are southeast of Charleston, east of Cape Hatteras, near Norfolk Canyon, off Delaware Bay, just south of Hudson Canyon and south of Cape Cod.
Local Airy isostatic anomaly profiles (two-dimensional, without sediment corrections) were computed along eight multichannel seismic profiles. The isostatic anomaly values over major basins beneath the shelf and rise are generally between −10 and −30 mgal while those over the platform areas are typically 0 to +20 mgal. While a few isostatic anomaly profiles show local 10–20 mgal increases seaward of the East Coast Magnetic Anomaly (ECMA: inferred to mark the ocean-continent boundary), the lack of a consistent correlation indicates that the relationship of isostatic gravity anomalies to the magnetic anomalies and the ocean—continent transition is variable.
Two-dimensional gravity models have been computed for two profiles off Cape Cod, Massachusetts and Cape May, New Jersey, where excellent reflection, refraction and magnetic control appear to define 10 and 12 km deep sedimentary basins beneath the shelf, respectively and 10 km deep basins beneath the rise. The basins are separated by a 6–8 km deep basement ridge which underlies the ECMA and appears to mark the landward edge of oceanic crust. The gravity models suggest that the oceanic crust is between 11 and 18 km thick beneath the ECMA, but decreases to a thickness of less than 8 km within the first 20–90 km to the southeast. In both profiles, the derived crustal thickness variations support the interpretation that the ECMA occurs over the ocean-continent boundary. The crust underlying the sedimentary cover appears to be 12 to 15 km thick on the landward side of the ECMA and gradually thickens to normal continental values of greater than 25 km within the first 60 to 110 km to the northwest. Multichannel seismic profiles across platform areas, such as Cape Hatteras and Cape Cod, indicate the ocean-continent transition zones there are much narrower than profiles across major sedimentary basins, such as the one off New Jersey.
","language":"English","publisher":"Elsevier","doi":"10.1016/0040-1951(79)90037-4","issn":"00401951","usgsCitation":"Grow, J.A., Bowin, C., and Hutchinson, D.R., 1979, The gravity field of the U.S. Atlantic continental margin: Tectonophysics, v. 59, no. 1-4, p. 27-52, https://doi.org/10.1016/0040-1951(79)90037-4.","productDescription":"26 p.","startPage":"27","endPage":"52","costCenters":[],"links":[{"id":221895,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"otherGeospatial":"U.S. Atlantic continental margin","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -75.3769109686547,\n 39.78365013639498\n ],\n [\n -76.7034359894871,\n 37.07447487187042\n ],\n [\n -81.91877362199935,\n 31.350346802537274\n ],\n [\n -80.98101607241426,\n 26.60548891457786\n ],\n [\n -80.61122194437507,\n 25.264459213874005\n ],\n [\n -79.29052020696197,\n 25.630663811699932\n ],\n [\n -79.9948730788135,\n 31.089394752519226\n ],\n [\n -68.34285225345012,\n 43.53401396846341\n ],\n [\n -66.85337779049772,\n 44.84520951820939\n ],\n [\n -69.5879551017428,\n 44.22504950316685\n ],\n [\n -71.56290526975728,\n 42.06077869142243\n ],\n [\n -75.3769109686547,\n 39.78365013639498\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"59","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bac97e4b08c986b3235db","contributors":{"authors":[{"text":"Grow, John A.","contributorId":25943,"corporation":false,"usgs":true,"family":"Grow","given":"John","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":363690,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bowin, C.O.","contributorId":44618,"corporation":false,"usgs":true,"family":"Bowin","given":"C.O.","email":"","affiliations":[],"preferred":false,"id":363692,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hutchinson, Deborah R. 0000-0002-2544-5466 dhutchinson@usgs.gov","orcid":"https://orcid.org/0000-0002-2544-5466","contributorId":521,"corporation":false,"usgs":true,"family":"Hutchinson","given":"Deborah","email":"dhutchinson@usgs.gov","middleInitial":"R.","affiliations":[{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":false,"id":363691,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70012416,"text":"70012416 - 1979 - Geology and tectonic development of the continental margin north of Alaska","interactions":[],"lastModifiedDate":"2025-09-02T16:51:24.052749","indexId":"70012416","displayToPublicDate":"2003-04-08T00:00:00","publicationYear":"1979","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3525,"text":"Tectonophysics","active":true,"publicationSubtype":{"id":10}},"title":"Geology and tectonic development of the continental margin north of Alaska","docAbstract":"The continental margin north of Alaska, as interpreted from seismic reflection profiles, is of the Atlantic type and consists of three sectors of contrasting structure and stratigraphy. The Chukchi sector, on the west, is characterized by the deep late Mesozoic and Tertiary North Chukchi basin and the Chukchi Continental Borderland. The Barrow sector of central northern Alaska is characterized by the Barrow arch and a moderately thick continental terrace build of Albian to Tertiary clastic sediment. The terrace sedimentary prism is underlain by lower Paleozoic metasedimentary rocks. The Barter Island sector of northeastern Alaska and Yukon Territory is inferred to contain a very thick prism of Jurassic, Cretaceous and Tertiary marine and nonmarine clastic sediment. Its structure is dominated by a local deep Tertiary depocenter and two regional structural arches.
We postulate that the distinguishing characteristics of the three sectors are inherited from the configuration of the rift that separated arctic Alaska from the Canadian Arctic Archipelago relative to old pre-rift highlands, which were clastic sediment sources. Where the rift lay relatively close to northern Alaska, in the Chukchi and Barter Island sectors, and locally separated Alaska from the old source terranes, thick late Mesozoic and Tertiary sedimentary prisms extend farther south beneath the continental shelf than in the intervening Barrow sector. The boundary between the Chukchi and Barrow sectors is relatively well defined by geophysical data, but the boundary between the Barrow and Barter Island sectors can only be inferred from the distribution and thickness of Jurassic and Cretaceous sedimentary rocks. These boundaries may be extensions of oceanic fracture zones related to the rifting that is postulated to have opened the Canada Basin, probably beginning during the Early Jurassic.
","language":"English","publisher":"Elsevier","doi":"10.1016/0040-1951(79)90050-7","issn":"00401951","usgsCitation":"Grantz, A., Eittreim, S., and Dinter, D.A., 1979, Geology and tectonic development of the continental margin north of Alaska: Tectonophysics, v. 59, no. 1-4, p. 263-291, https://doi.org/10.1016/0040-1951(79)90050-7.","productDescription":"29 p.","startPage":"263","endPage":"291","costCenters":[],"links":[{"id":221893,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Alaska","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -172.11589499397513,\n 73.56845265796551\n ],\n [\n -172.11589499397513,\n 66.39262903165613\n ],\n [\n -140.49034024384332,\n 66.39262903165613\n ],\n [\n -140.49034024384332,\n 73.56845265796551\n ],\n [\n -172.11589499397513,\n 73.56845265796551\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"59","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a243fe4b0c8380cd57f06","contributors":{"authors":[{"text":"Grantz, Arthur agrantz@usgs.gov","contributorId":2585,"corporation":false,"usgs":true,"family":"Grantz","given":"Arthur","email":"agrantz@usgs.gov","affiliations":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"preferred":true,"id":363487,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Eittreim, Stephen","contributorId":102553,"corporation":false,"usgs":true,"family":"Eittreim","given":"Stephen","email":"","affiliations":[],"preferred":false,"id":363488,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Dinter, David A.","contributorId":104010,"corporation":false,"usgs":true,"family":"Dinter","given":"David","middleInitial":"A.","affiliations":[],"preferred":false,"id":363489,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70010343,"text":"70010343 - 1979 - Earliest Phanerozoic or latest Proterozoic fossils from the Arabian Shield","interactions":[],"lastModifiedDate":"2025-06-25T16:28:45.597673","indexId":"70010343","displayToPublicDate":"2003-04-08T00:00:00","publicationYear":"1979","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3112,"text":"Precambrian Research","active":true,"publicationSubtype":{"id":10}},"title":"Earliest Phanerozoic or latest Proterozoic fossils from the Arabian Shield","docAbstract":"We report here the first biologically definable fossils from pre-Saq (pre-Middle Cambrian) rocks of the Arabian Shield. They include the distinctive helically coiled tubular filaments of the oscillatorialean blue-green alga Obruchevella parva as well as two size classes of spheroidal unicells of uncertain affinity. Also present is the conical stromatolite Conophyton and unidentified stromatolites. All occur in cherty limestones of the Jubaylah Group, northern Saudi Arabia, a nonmarine to locally marine taphrogeosynclinal sequence that fills depressions along the northwest-trending Najd faults.
Conophyton has heretofore been found only in strata older than about 680 Ma (except for puzzling records in modern hot springs) while Obruchevella is so far known only from rocks between about 680 and 470 Ma old. Thus it appears that the Jubaylah Group is close to the Proterozoic-Phanerozoic transition. The simple spheroidal nanno-fossils are not diagnostic as to age. Their relationships within what appears to be early diagenetic chert suggest a classical algal-mat association. The brecciated and microchanneled appearance of much of the fossiliferous rock, its locally dolomitic nature, and the prevalence of cryptalgalaminate favors a very shallow, locally turbulent, and perhaps episodically exposed marine or marginal marine setting.
The Jubaylah Group lies unconformably beneath the Siq Sandstone (basal member of the Saq Sandstone) of medial Cambrian age, rests nonconformably on crystalline basement, and has yielded a K-Ar whole-rock age (on andesitic basalt) of ∼540 Ma. To judge from the fossils, however, that age may be as much as 100 Ma or more too young.
Detailed stratigraphic and sedimentological studies of the Tertiary Tongue River Member of the Fort Union Formation in the Powder River Basin, Wyoming, and the Cretaceous Blackhawk Formation and Star Point Sandstone in the Wasatch Plateau, Utah, indicate that the depositional environments of coal played a major role in controlling coal thickness, lateral continuity, potential minability, and type of floor and roof rocks.
The potentially minable, thick coal beds of the Tongue River Member were primarily formed in long-lived floodbasin backswamps of upper alluvial plain environment. Avulsion of meandering fluvial channels contributed to the erratic lateral extent of coals in this environment. Laterally extensive coals formed in floodbasin backswamps of a lower alluvial plain environment; however, interruption by overbank and crevasse-splay sedimentation produced highly split and merging coal beds. Lacustrine sedimentation common to the lower alluvial plain, similar to the lake-covered lower alluvial valley of the Atchafalaya River Basin, is related to a high-constructive delta. In contrast to these alluvial coals are the deltaic coal deposits of the Blackhawk Formation. The formation consists of three coal populations: upper delta plain, lower delta plain, and ‘back-barrier’. Coals of the lower delta plain are thick and laterally extensive, in contrast to those of the upper delta plain and ‘back-barrier’, which contain abundant, very thin and laterally discontinuous carbonaceous shale partings. The reworking of the delta-front sediments of the Star Point Sandstone suggests that the Blackhawk-Star Point delta was a high-destructive system.
","language":"English","publisher":"Elsevier","doi":"10.1016/0146-6380(79)90025-1","issn":"01466380","usgsCitation":"Flores, R.M., 1979, Coal depositional models in some Tertiary and Cretaceous coal fields in the U.S. Western Interior: Organic Geochemistry, v. 1, no. 4, p. 225-235, https://doi.org/10.1016/0146-6380(79)90025-1.","productDescription":"11 p.","startPage":"225","endPage":"235","costCenters":[],"links":[{"id":222307,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Utah, Wyoming","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -114.00659141534686,\n 37.08023447452048\n ],\n [\n -109.0076528247364,\n 36.96619182149696\n ],\n [\n -109.07471412635108,\n 40.99871391889657\n ],\n [\n -104.18755755347226,\n 41.120180201640544\n ],\n [\n -104.09244491184933,\n 44.964763141991455\n ],\n [\n -110.97654317008451,\n 44.99466583939204\n ],\n [\n -111.11231189819526,\n 42.04396900626108\n ],\n [\n -113.98964509189172,\n 42.03764926386135\n ],\n [\n -114.00659141534686,\n 37.08023447452048\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"1","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059f683e4b0c8380cd4c7dc","contributors":{"authors":[{"text":"Flores, R. M.","contributorId":106899,"corporation":false,"usgs":true,"family":"Flores","given":"R.","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":363587,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70012634,"text":"70012634 - 1979 - Anomalous topography on the continental shelf around Hudson Canyon","interactions":[],"lastModifiedDate":"2025-04-18T15:08:40.12771","indexId":"70012634","displayToPublicDate":"2003-04-04T00:00:00","publicationYear":"1979","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2667,"text":"Marine Geology","active":true,"publicationSubtype":{"id":10}},"title":"Anomalous topography on the continental shelf around Hudson Canyon","docAbstract":"Recent seismic-reflection data show that the topography on the Continental Shelf around Hudson Canyon is composed of a series of depressions having variable spacings (< 100 m to 2 km), depths (1–10 m), outlines, and bottom configurations that give the sea floor an anomalous “jagged” appearance in profile. The acoustic and sedimentary characteristics, the proximity to relict shores, and the areal distribution indicate that this rough topography is an erosional surface formed on Upper Pleistocene silty sands about 13,000 to 15,000 years ago by processes related to Hudson Canyon. The pronounced southward extension of the surface, in particular, may reflect a former increase in the longshore-current erosion capacity caused by the loss of sediments over the canyon. Modern erosion or nondeposition of sediments has prevented the ubiquitous sand sheet on the Middle Atlantic shelf from covering the surface. The “anomalous” topography may, in fact, be characteristic of areas near other submarine canyons that interrupt or have interrupted the longshore drift of sediments.
","language":"English","publisher":"Elsevier","doi":"10.1016/0025-3227(79)90074-4","issn":"00253227","usgsCitation":"Knebel, H., 1979, Anomalous topography on the continental shelf around Hudson Canyon: Marine Geology, v. 33, no. 3-4, p. 67-75, https://doi.org/10.1016/0025-3227(79)90074-4.","productDescription":"9 p.","startPage":"67","endPage":"75","costCenters":[],"links":[{"id":222732,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","otherGeospatial":"Hudson Canyon","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -73.26025990607206,\n 40.82461604636316\n ],\n [\n -73.26025990607206,\n 37.61322094205855\n ],\n [\n -65.72718797674679,\n 37.61322094205855\n ],\n [\n -65.72718797674679,\n 40.82461604636316\n ],\n [\n -73.26025990607206,\n 40.82461604636316\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"33","issue":"3-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059ec4be4b0c8380cd4919e","contributors":{"authors":[{"text":"Knebel, H.J.","contributorId":79092,"corporation":false,"usgs":true,"family":"Knebel","given":"H.J.","affiliations":[],"preferred":false,"id":364105,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":60644,"text":"mf1134 - 1979 - Maps showing late Pleistocene and Holocene evolution of the South Texas continental shelf","interactions":[],"lastModifiedDate":"2014-03-10T12:18:35","indexId":"mf1134","displayToPublicDate":"1994-01-01T07:00:00","publicationYear":"1979","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":325,"text":"Miscellaneous Field Studies Map","code":"MF","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"1134","title":"Maps showing late Pleistocene and Holocene evolution of the South Texas continental shelf","docAbstract":"Interpretation of acoustical profiles has provided insight into the late Quaternary geologic history of the Continental Shelf off South Texas. (See the geographic index map on sheet 1 for location of the area studied.) The profiles reveal the interplay of tectonism, sedimentation, and cyclic fluctuations of sea level in the building and geologic evolution of the continental terrace. The sequence of sediments studied extends to about 200 meters (m) beneath the sea-floor surface. Four seismic-stratigraphic units underlain by four prominent sound reflectors were identified and mapped.
\nThis geologic synthesis, for which the research was funded by the U.S. Bureau of Land Management (BLM), is but one aspect of a coordinated, multidisciplinary environmental study of the South Texas Outer Continental Shelf sponsored by BLM (Berryhill, 1976, 1977). The environmental studies are keyed to the leasing of Federal Outer Continental Shelf (OCS) lands for petroleum exploration and production. Their purpose is to provide the data development of petroleum resources on the OCS, as well as to provide the basis for predicting the impact of oil and gas exploration and production on the marine environment. Of primary concern is the recognition of geologic conditions that might be hazardous to structures placed on the sea floor. Geologic hazards relate directly to the potential for significant movement of the sea floor in the future. Judging sea-floor stability and recognizing geologic features that are potentially hazardous require an understanding of the recent geologic history of the area, which, in turn, entails determining the relative rates and interactions of sedimentation and tectonism through time.
\nIn addition to the primary objective, the synthesis provides knowledge about the magnitude and extent of sea-level fluctuations in the western Gulf of Mexico, and it provides a depositional facies model of possible use in appraising the resource potential of the more deeply buried sediments.
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Denver, CO","doi":"10.3133/mf1134","isbn":"0607806249","usgsCitation":"Pyle, C.A., Berryhill, H.L., and Trippet, A.R., 1979, Maps showing late Pleistocene and Holocene evolution of the South Texas continental shelf: U.S. Geological Survey Miscellaneous Field Studies Map 1134, 2 Sheets: 50.13 x 36.20 inches; 41.96 x 33.93 inches, https://doi.org/10.3133/mf1134.","productDescription":"2 Sheets: 50.13 x 36.20 inches; 41.96 x 33.93 inches","costCenters":[],"links":[{"id":179880,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/mf1134.jpg"},{"id":283652,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/mf/1134/plate-1.pdf"},{"id":283653,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/mf/1134/plate-2.pdf"}],"scale":"92000","country":"United States","state":"Texas","otherGeospatial":"South Texas Continental Shelf","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -97.0,26.0 ], [ -97.0,28.0 ], [ -96.0,28.0 ], [ -96.0,26.0 ], [ -97.0,26.0 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a19e4b07f02db605b3b","contributors":{"authors":[{"text":"Pyle, Carroll A.","contributorId":58343,"corporation":false,"usgs":true,"family":"Pyle","given":"Carroll","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":264126,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Berryhill, Henry L. Jr.","contributorId":86753,"corporation":false,"usgs":true,"family":"Berryhill","given":"Henry","suffix":"Jr.","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":264128,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Trippet, Anita R.","contributorId":67159,"corporation":false,"usgs":true,"family":"Trippet","given":"Anita","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":264127,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":27022,"text":"wri79106 - 1979 - Geohydrology and digital-simulation model of the Farrington aquifer in the northern coastal plain of New Jersey","interactions":[],"lastModifiedDate":"2012-06-20T01:01:36","indexId":"wri79106","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1979","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":342,"text":"Water-Resources Investigations Report","code":"WRI","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"79-106","title":"Geohydrology and digital-simulation model of the Farrington aquifer in the northern coastal plain of New Jersey","docAbstract":"A two-dimensional digital-computer flow model was developed to simulate the Farrington aquifer in the northern part of the Coastal Plain of New Jersey. The area of detailed study includes approximately 500 square miles in Middlesex and Monmouth Couties where the aquifer provides a large part of the municipal and industrial water supply. The area modeled is much larger, extending seaward as well as northeastward into Long Island. The aquifer consists chiefly of the Farrington Sand Member of the Raritan Formation and is composed of sand and some gravel. It thickens from a featheredge in outcrop to more than 170 feet, 11 miles to the southeast. The confining unit between the Farrington and the overlying Old Bridge Sand Member of the Magothy Formation consists primarily of the Woodbridge Clay Member of the Raritan Formation and has a maximum thickness of 244 feet. The model simulates both water-table and artesian conditions. The confining unit overlying the Farrington aquifer is simulated as having a variable thickness and vertical hydraulic conductivity. The effect of a declining water level in the overlying Old Bridge aquifer on the Farrington aquifer is also simulated by the model. Values used to describe the hydraulic properties of the Farrington aquifer are: a hydraulic conductivity of 105 feet per day, a storage coefficient of 1.6 x 10-4 for artesian conditions, and a specific yield of 0.25 for water-table conditions. Values for the overlying confining unit are: a vertical hydraulic conductivity ranging from 4.2 x 10-7 to 1.0 x 10-10 feet per second and a specific storage of 4 x 10-5 feet-1. Aquifer simulation for the 15-year period, 1959-73, was used to calibrage the model. The model was calibrated by comparing the observed potentiometric surface of November 1973 with the simulated potentiometric surface. In addition, hydrographs for selected wells were compared with model results. Ground-water withdrawals for 1959 and 1973 were 12.1 and 28.5 milion gallons per day, respectively. Potentiometric surfaces for 1985 and 2000 were computed based on a linear projection of ground-water withdrawals (39.5 and 56.9 million gallons per day in 1985 and 2000, respectively) of the period 1959 through 1973. These surfaces are deeper than that of November, 1973, and the cone of depression is wider. The potentiometric head projected by the model in the vicinity of Sayreville will be more than 150 feet below mean sea level by 2000; the head in this area was 70 feet below sea level in 1973. The model calculated ground-water budgets for steady-state and transient conditions for the entire modeled area and for several rectangular subareas. Ground-water flow into the modeled Farrington aquifer under steady-state conditions before ground-water development was 16 cubic feet per second for the entire area. Recharge in the outcrop area and vertical leakage from the Old Bridge was 8 cubic feet per second each. Approximately 75 percent of the discharge occurred as seepage into surface-water bodies in and near the outcrop and as lateral flow southwestward into Burlington County near the outcrop area. The remaining 25 percent occurred southeast of the outcrop as vertical leakage into the overlying Old Bridge aquifer and as lateral flow to the south into Ocean and Burlington Counties. A transient water budget for 1973 was calculated for a subarea consisting mainly of Middlesex County. The model indicates that 48 percent (14.3 cubic feet per second) of the total inflow to the subareas was through its boundaries. Other sources of water include direct recharge within the subarea (5.4 cubic feet per second), vertical leakage (mainly from the Old Bridge) within the subarea (2.6 cubic feet per second), and water released from storage (3.4 cubic feet per second). Discharge from the subarea consisted mainly of withdrawals (26.5 cubic feet per second). It also included vertical leakage to the Old Bridge and discharge to surface-water bodies simulated by constant-head nodes (3.2 cubic feet per second).","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/wri79106","collaboration":"Prepared in cooperation with the New Jersey Department of Environmental Protection","usgsCitation":"Farlekas, G.M., 1979, Geohydrology and digital-simulation model of the Farrington aquifer in the northern coastal plain of New Jersey: U.S. Geological Survey Water-Resources Investigations Report 79-106, vi, 55 p., https://doi.org/10.3133/wri79106.","productDescription":"vi, 55 p.","onlineOnly":"Y","costCenters":[{"id":470,"text":"New Jersey Water Science Center","active":true,"usgs":true}],"links":[{"id":158561,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/wri_79_106.gif"},{"id":257664,"rank":100,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/preview/wri/1979/106/","linkFileType":{"id":5,"text":"html"}}],"country":"United States","state":"New Jersey","county":"Burlington;Middlesex;Monmouth;Ocean","otherGeospatial":"Farrington Aquifer;Long Island;Old Bridge Aquifer","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -75,39 ], [ -75,41.5 ], [ -72.25,41.5 ], [ -72.25,39 ], [ -75,39 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b05e4b07f02db699e78","contributors":{"authors":[{"text":"Farlekas, George M.","contributorId":44963,"corporation":false,"usgs":true,"family":"Farlekas","given":"George","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":197423,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ]}