{"pageNumber":"1462","pageRowStart":"36525","pageSize":"25","recordCount":40841,"records":[{"id":70014217,"text":"70014217 - 1987 - Coal deposits of the United States","interactions":[],"lastModifiedDate":"2024-02-24T01:12:26.417172","indexId":"70014217","displayToPublicDate":"1987-01-01T00:00:00","publicationYear":"1987","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2033,"text":"International Journal of Coal Geology","active":true,"publicationSubtype":{"id":10}},"title":"Coal deposits of the United States","docAbstract":"

The coal fields of the Unites States can be divided into six major provinces. The Appalachian and Interior Provinces contain dominantly bituminous coal in strata of Pennsylvanian age. The coal seams are relatively thin and are mined both by surface and underground methods. Sulfyur content is low to moderate in the Appalachian Province, generally high in the Interior province. The Gulf Coastal Plain Province, in Texas and neighboring states, contains lignite of Eocene age. The seams are 3–25 ft (0.9–7.5 m) thick and are minded in large open pits. The Northern Great Plains Province has lignite and subbituminous coal of Cretaceous, Paleocene and Eocene age. The coal, largely very low in sulfur, occurs in beds up to 100 ft (30 m) thick and is strip-mined. The Rocky Mountain Province contains a great variety of coal deposits in numerous separate intermontane basins. Most of it is low-sulfur subbituminous to bituminous coal iof Creatceous and early Tertiary age. The seams range from a few feet to over 100 ft (30 m) thick. Strip-mining dominates but underground mines are important in Utah and Colorado. The Pacific Coast Province, which includes Alaska, contains enormous cola resources but has seen little mining. The coal is highly diverse in physical character and geologic setting.

","language":"English","publisher":"Elsevier","doi":"10.1016/0166-5162(87)90072-3","issn":"01665162","usgsCitation":"John, N.W., 1987, Coal deposits of the United States: International Journal of Coal Geology, v. 8, no. 4, p. 355-365, https://doi.org/10.1016/0166-5162(87)90072-3.","productDescription":"11 p.","startPage":"355","endPage":"365","numberOfPages":"11","costCenters":[],"links":[{"id":225944,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"8","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059f685e4b0c8380cd4c7e5","contributors":{"authors":[{"text":"John, Nelson W.","contributorId":34348,"corporation":false,"usgs":true,"family":"John","given":"Nelson","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":367875,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70014643,"text":"70014643 - 1987 - Behavior of sensitivities in the one-dimensional advection-dispersion equation: Implications for parameter estimation and sampling design","interactions":[],"lastModifiedDate":"2018-02-21T11:09:03","indexId":"70014643","displayToPublicDate":"1987-01-01T00:00:00","publicationYear":"1987","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3722,"text":"Water Resources Research","onlineIssn":"1944-7973","printIssn":"0043-1397","active":true,"publicationSubtype":{"id":10}},"title":"Behavior of sensitivities in the one-dimensional advection-dispersion equation: Implications for parameter estimation and sampling design","docAbstract":"

The spatial and temporal variability of sensitivities has a significant impact on parameter estimation and sampling design for studies of solute transport in porous media. Physical insight into the behavior of sensitivities is offered through an analysis of analytically derived sensitivities for the one-dimensional form of the advection-dispersion equation. When parameters are estimated in regression models of one-dimensional transport, the spatial and temporal variability in sensitivities influences variance and covariance of parameter estimates. Several principles account for the observed influence of sensitivities on parameter uncertainty. (1) Information about a physical parameter may be most accurately gained at points in space and time with a high sensitivity to the parameter. (2) As the distance of observation points from the upstream boundary increases, maximum sensitivity to velocity during passage of the solute front increases and the consequent estimate of velocity tends to have lower variance. (3) The frequency of sampling must be “in phase” with the S shape of the dispersion sensitivity curve to yield the most information on dispersion. (4) The sensitivity to the dispersion coefficient is usually at least an order of magnitude less than the sensitivity to velocity. (5) The assumed probability distribution of random error in observations of solute concentration determines the form of the sensitivities. (6) If variance in random error in observations is large, trends in sensitivities of observation points may be obscured by noise and thus have limited value in predicting variance in parameter estimates among designs. (7) Designs that minimize the variance of one parameter may not necessarily minimize the variance of other parameters. (8) The time and space interval over which an observation point is sensitive to a given parameter depends on the actual values of the parameters in the underlying physical system.

","language":"English","publisher":"American Geophysical Union","doi":"10.1029/WR023i002p00253","usgsCitation":"Knopman, D.S., and Voss, C.I., 1987, Behavior of sensitivities in the one-dimensional advection-dispersion equation: Implications for parameter estimation and sampling design: Water Resources Research, v. 23, no. 2, p. 253-272, https://doi.org/10.1029/WR023i002p00253.","productDescription":"20 p.","startPage":"253","endPage":"272","costCenters":[],"links":[{"id":225522,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"23","issue":"2","noUsgsAuthors":false,"publicationDate":"2010-07-09","publicationStatus":"PW","scienceBaseUri":"5059ef7de4b0c8380cd4a285","contributors":{"authors":[{"text":"Knopman, Debra S.","contributorId":51472,"corporation":false,"usgs":true,"family":"Knopman","given":"Debra","email":"","middleInitial":"S.","affiliations":[],"preferred":false,"id":368896,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Voss, Clifford I. 0000-0001-5923-2752 cvoss@usgs.gov","orcid":"https://orcid.org/0000-0001-5923-2752","contributorId":1559,"corporation":false,"usgs":true,"family":"Voss","given":"Clifford","email":"cvoss@usgs.gov","middleInitial":"I.","affiliations":[{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true}],"preferred":true,"id":368895,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70014672,"text":"70014672 - 1987 - A compositional multiphase model for groundwater contamination by petroleum products: 2. Numerical solution","interactions":[],"lastModifiedDate":"2020-01-17T17:25:02","indexId":"70014672","displayToPublicDate":"1987-01-01T00:00:00","publicationYear":"1987","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3722,"text":"Water Resources Research","onlineIssn":"1944-7973","printIssn":"0043-1397","active":true,"publicationSubtype":{"id":10}},"title":"A compositional multiphase model for groundwater contamination by petroleum products: 2. Numerical solution","docAbstract":"

In this paper we develop a numerical solution to equations developed in part 1 (M. Y. Corapcioglu and A. L. Baehr, this issue) to predict the fate of an immiscible organic contaminant such as gasoline in the unsaturated zone subsequent to plume establishment. This solution, obtained by using a finite difference scheme and a method of forward projection to evaluate nonlinear coefficients, provides estimates of the flux of solubilized hydrocarbon constituents to groundwater from the portion of a spill which remains trapped in a soil after routine remedial efforts to recover the product have ceased. The procedure was used to solve the one-dimensional (vertical) form of the system of nonlinear partial differential equations defining the transport for each constituent of the product. Additionally, a homogeneous, isothermal soil with constant water content was assumed. An equilibrium assumption partitions the constituents between air, water, adsorbed, and immiscible phases. Free oxygen transport in the soil was also simulated to provide an upper bound estimate of aerobic biodgradation rates. Results are presented for a hypothetical gasoline consisting of eight groups of hydrocarbon constituents. Rates at which hydrocarbon mass is removed from the soil, entering either the atmosphere or groundwater, or is biodegraded are presented. A significant sensitivity to model parameters, particularly the parameters characterizing diffusive vapor transport, was discovered. We conclude that hydrocarbon solute composition in groundwater beneath a gasoline contaminated soil would be heavily weighted toward aromatic constituents like benzene, toluene, and xylene.

","language":"English","publisher":"American Geophysical Union","doi":"10.1029/WR023i001p00201","usgsCitation":"Baehr, A.L., and Corapcioglu, M.Y., 1987, A compositional multiphase model for groundwater contamination by petroleum products: 2. Numerical solution: Water Resources Research, v. 23, no. 1, p. 201-213, https://doi.org/10.1029/WR023i001p00201.","productDescription":"13 p.","startPage":"201","endPage":"213","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":226037,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"23","issue":"1","noUsgsAuthors":false,"publicationDate":"2010-07-09","publicationStatus":"PW","scienceBaseUri":"5059e382e4b0c8380cd46096","contributors":{"authors":[{"text":"Baehr, Arthur L.","contributorId":104523,"corporation":false,"usgs":true,"family":"Baehr","given":"Arthur","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":368969,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Corapcioglu, M. Yavuz","contributorId":43114,"corporation":false,"usgs":false,"family":"Corapcioglu","given":"M.","email":"","middleInitial":"Yavuz","affiliations":[],"preferred":false,"id":368968,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70014646,"text":"70014646 - 1987 - On the functional optimization of a certain class of nonstationary spatial functions","interactions":[],"lastModifiedDate":"2012-03-12T17:19:34","indexId":"70014646","displayToPublicDate":"1987-01-01T00:00:00","publicationYear":"1987","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2407,"text":"Journal of Optimization Theory and Applications","active":true,"publicationSubtype":{"id":10}},"title":"On the functional optimization of a certain class of nonstationary spatial functions","docAbstract":"Procedures are developed in order to obtain optimal estimates of linear functionals for a wide class of nonstationary spatial functions. These procedures rely on well-established constrained minimum-norm criteria, and are applicable to multidimensional phenomena which are characterized by the so-called hypothesis of inherentity. The latter requires elimination of the polynomial, trend-related components of the spatial function leading to stationary quantities, and also it generates some interesting mathematics within the context of modelling and optimization in several dimensions. The arguments are illustrated using various examples, and a case study computed in detail. ?? 1987 Plenum Publishing Corporation.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Optimization Theory and Applications","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisherLocation":"Kluwer Academic Publishers-Plenum Publishers","doi":"10.1007/BF00941280","issn":"00223239","usgsCitation":"Christakos, G., and Paraskevopoulos, P., 1987, On the functional optimization of a certain class of nonstationary spatial functions: Journal of Optimization Theory and Applications, v. 52, no. 2, p. 191-208, https://doi.org/10.1007/BF00941280.","startPage":"191","endPage":"208","numberOfPages":"18","costCenters":[],"links":[{"id":487230,"rank":10000,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"http://doi.org/10.1007/BF00941280","text":"External Repository"},{"id":205635,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/BF00941280"},{"id":225525,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"52","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a6dd2e4b0c8380cd75345","contributors":{"authors":[{"text":"Christakos, G.","contributorId":87685,"corporation":false,"usgs":true,"family":"Christakos","given":"G.","email":"","affiliations":[],"preferred":false,"id":368905,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Paraskevopoulos, P.N.","contributorId":105062,"corporation":false,"usgs":true,"family":"Paraskevopoulos","given":"P.N.","email":"","affiliations":[],"preferred":false,"id":368906,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70014277,"text":"70014277 - 1987 - Observations and controls on the occurrence of inherited zircon in Concord-type granitoids, New Hampshire","interactions":[],"lastModifiedDate":"2024-04-03T16:00:45.181491","indexId":"70014277","displayToPublicDate":"1987-01-01T00:00:00","publicationYear":"1987","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1759,"text":"Geochimica et Cosmochimica Acta","active":true,"publicationSubtype":{"id":10}},"title":"Observations and controls on the occurrence of inherited zircon in Concord-type granitoids, New Hampshire","docAbstract":"

U-Pb analyses of zircons separated from two Concord-type plutons near Sunapee and Dixville Notch, New Hampshire, reveal differences in the pattern and magnitude of zircon inheritance which are related to differences in melt chemistry. The Sunapee pluton contains only slightly more Zr than required to saturate the melt at the peak temperature of 700 ± 30°C. Traces of inherited zircon in this separate are inferred to be present as small, largely resorbed grains. In contrast, the Long Mountain pluton, near Dixville Notch, contains about 240% more Zr than required to saturate the melt. Thus, more than half of the Zr existed as stable, inherited zircon crystals during the partial fusion event, consistent with the observation of substantial inheritance in all grain size fractions. Ion probe intra-grain analyses of zircon from the Long Mountain pluton indicate a complex pattern of inheritance with contributions from at least two Proterozoic terrenes and caution against simple interpretations of upper and lower intercepts of chords containing an inherited component. Ion probe analyses of zircons from the Sunapee pluton reveal clear evidence of U loss which results in incorrect apparent conventional U-Pb ages. Ages of crystallization for the Long Mountain and Sunapee pluton are ~350 and 354 ± 5 Ma, respectively. A Sm/Nd measurement for the Long Mountain pluton yields a depleted mantle model age of 1.5 Ga, consistent with the observed inheritance pattern. In contrast, a Sm/Nd model age for the Sunapee pluton is improbably old due to minor monazite fractionation.

","language":"English","publisher":"Elsevier","doi":"10.1016/0016-7037(87)90305-X","issn":"00167037","usgsCitation":"Harrison, T., Aleinikoff, J.N., and Compston, W., 1987, Observations and controls on the occurrence of inherited zircon in Concord-type granitoids, New Hampshire: Geochimica et Cosmochimica Acta, v. 51, no. 9, p. 2549-2558, https://doi.org/10.1016/0016-7037(87)90305-X.","productDescription":"10 p.","startPage":"2549","endPage":"2558","numberOfPages":"10","costCenters":[],"links":[{"id":225826,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"51","issue":"9","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a6a6be4b0c8380cd7416c","contributors":{"authors":[{"text":"Harrison, T.M.","contributorId":60788,"corporation":false,"usgs":true,"family":"Harrison","given":"T.M.","email":"","affiliations":[],"preferred":false,"id":368013,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Aleinikoff, J. N. 0000-0003-3494-6841","orcid":"https://orcid.org/0000-0003-3494-6841","contributorId":75132,"corporation":false,"usgs":true,"family":"Aleinikoff","given":"J.","email":"","middleInitial":"N.","affiliations":[],"preferred":false,"id":368014,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Compston, W.","contributorId":36691,"corporation":false,"usgs":true,"family":"Compston","given":"W.","email":"","affiliations":[],"preferred":false,"id":368012,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70014212,"text":"70014212 - 1987 - Modeling and analysis of direct-current electrical resistivity in the Durham Triassic basin, North Carolina","interactions":[],"lastModifiedDate":"2023-11-15T16:40:43.85911","indexId":"70014212","displayToPublicDate":"1987-01-01T00:00:00","publicationYear":"1987","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1761,"text":"Geoexploration","active":true,"publicationSubtype":{"id":10}},"title":"Modeling and analysis of direct-current electrical resistivity in the Durham Triassic basin, North Carolina","docAbstract":"

Sixty-two Schlumberger electrical soundings were made in the Durham Triassic basin in an effort to determine basin structural geometry, depth of the sedimentary layers, and spatial distribution of individual rock facies. A digital computer program was used to invert the sounding curves of apparent resistivity versus distance to apparent resistivity versus depth. The apparent-resistivity-versus-depth data from the computer-modeling program were used to construct a geoelectric model of the basin that is believed to accurately represent the subsurface geology of the basin. The largest depth to basement in the basin along a resistivity profile (geoelectric section) was determined to be 1,800 m. A resistivity decrease was observed on certain soundings from depths of 100 to 1,000 m; below a 1,000-m depth, apparent resistivity increased to the bottom of the basin. Resistivity values for basement rocks were greater than 1,000 ohm-m and less than 350 ohm-m for the sedimentary layers in the basin. The data suggest that the basin contains a system of step faults near its eastern boundary.

","language":"English","publisher":"Elsevier","doi":"10.1016/0016-7142(87)90012-3","usgsCitation":"Brown, C.E., 1987, Modeling and analysis of direct-current electrical resistivity in the Durham Triassic basin, North Carolina: Geoexploration, v. 24, no. 6, p. 429-440, https://doi.org/10.1016/0016-7142(87)90012-3.","productDescription":"12 p.","startPage":"429","endPage":"440","numberOfPages":"12","costCenters":[],"links":[{"id":225880,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"North Carolina","otherGeospatial":"Durham basin","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -80.11054032257658,\n 34.81424858901997\n ],\n [\n -78.71952572597303,\n 35.63369969562967\n ],\n [\n -78.29487040818577,\n 36.369481295510155\n ],\n [\n -78.80312574155963,\n 36.15648733554863\n ],\n [\n -79.43844490827757,\n 35.6255443614009\n ],\n [\n -80.1172332811392,\n 35.01166900462569\n ],\n [\n -80.28442253553915,\n 34.81424671856449\n ],\n [\n -80.11054032257658,\n 34.81424858901997\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"24","issue":"6","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a5bd4e4b0c8380cd6f828","contributors":{"authors":[{"text":"Brown, C. Erwin","contributorId":96261,"corporation":false,"usgs":true,"family":"Brown","given":"C.","email":"","middleInitial":"Erwin","affiliations":[],"preferred":false,"id":367869,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70014859,"text":"70014859 - 1987 - Playa-lake basins on the Southern High Plains of Texas and New Mexico: Part II. A hydrologic model and mass-balance arguments for their development.","interactions":[],"lastModifiedDate":"2023-12-28T01:01:09.307497","indexId":"70014859","displayToPublicDate":"1987-01-01T00:00:00","publicationYear":"1987","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1786,"text":"Geological Society of America Bulletin","active":true,"publicationSubtype":{"id":10}},"title":"Playa-lake basins on the Southern High Plains of Texas and New Mexico: Part II. A hydrologic model and mass-balance arguments for their development.","docAbstract":"

Hydrologic, geologic, geomorphic, and mass-balance data suggest that most of the ∼30,000 playa lake basins on the Southern High Plains have developed by a combination of dissolution of caliche and piping of surface material into the unsaturated zone rather than by eolian processes as has generally been stated. A conceptual model suggests that particulate organic material, much of which is sorbed on smectite clays, is carried downward from the surface into the unsaturated zone by recharging water. The organic material is oxidized to CO2, which dissolves in the water, forms carbonic acid, and dissolves lithologic carbonates. Because organic material is transported and oxidized deep in the unsaturated zone, CO2 concentrations are much higher at depth than in the soil zone, and recharging water remains thermodynamically subsaturated with respect to carbonates and thus able to dissolve them throughout the unsaturated zone. Dissolution promotes lithologic instability, leading to piping and eluviation of material within the unsaturated zone. Playa basins expand laterally as recharge is concentrated at the edge of the playa floor because of lowered permeability in the center that results from accumulation of clays and other fine sediment.

Mass-balance calculations of gas, liquid, and solid fluxes beneath a playa basin suggest that sufficient mass is transported to account for the volume of the depression. Particulate flux is estimated by relating it to the CO2 flux out of the unsaturated zone. Solute flux is estimated from the difference between input values from the playa lake water and that observed in ground water. Gas flux is measured directly from gas samples at specific depths below the: surface.

","language":"English","publisher":"Geological Society of America","doi":"10.1130/0016-7606(1987)99<224:PBOTSH>2.0.CO;2","usgsCitation":"Wood, W., and Osterkamp, W.R., 1987, Playa-lake basins on the Southern High Plains of Texas and New Mexico: Part II. A hydrologic model and mass-balance arguments for their development.: Geological Society of America Bulletin, v. 99, no. 2, p. 224-230, https://doi.org/10.1130/0016-7606(1987)99<224:PBOTSH>2.0.CO;2.","productDescription":"7 p.","startPage":"224","endPage":"230","numberOfPages":"7","costCenters":[],"links":[{"id":225735,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"99","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a7c38e4b0c8380cd79882","contributors":{"authors":[{"text":"Wood, W.W.","contributorId":21974,"corporation":false,"usgs":true,"family":"Wood","given":"W.W.","email":"","affiliations":[],"preferred":false,"id":369462,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Osterkamp, W. R.","contributorId":46044,"corporation":false,"usgs":true,"family":"Osterkamp","given":"W.","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":369463,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70014836,"text":"70014836 - 1987 - Infragravity waves over a natural barred profile","interactions":[],"lastModifiedDate":"2024-06-24T16:01:25.778963","indexId":"70014836","displayToPublicDate":"1987-01-01T00:00:00","publicationYear":"1987","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":6453,"text":"Journal of Geophysical Research Solid Earth","active":true,"publicationSubtype":{"id":10}},"title":"Infragravity waves over a natural barred profile","docAbstract":"

Measurements of cross-shore flow were made across the surf zone during a storm as a nearshore bar became better developed and migrated offshore. Measured infragravity band spectra were compared to synthetic spectra calculated numerically over the natural barred profile assuming a white run-up spectrum of leaky mode or high-mode edge waves. As in earlier studies, the spectra compared closely; however, for some frequencies the energy of the measured spectrum exceeded the energy of the synthetic spectrum, suggesting that the run-up spectrum was not white but had dominating frequencies. Utilizing cross-shore flow data and synthetic spectra from a number of cross-shore locations, an equivalent run-up spectrum was calculated for each day. On the first day of the storm, the equivalent run-up spectrum indicated a dominant wave that had a node in velocity reasonably close to the bar crest. Later during the storm, when the bar had migrated farther offshore, there was no evidence for a dominant motion having a velocity node at the bar crest. The structure of the equivalent run-up spectrum compared well with spectra of direct measurements of run-up obtained several hundred meters away. We have no clear evidence in support of the theory that infragravity waves might form or force the offshore migration of a bar. To confirm this finding, longer records obtained synoptically over a developing bar are required. The dominant wave observed early in the storm was consistent with Symond and Bowen's (1984) theoretical prediction of resonant amplification of discrete frequencies over a barred profile.

","language":"English","publisher":"American Geophysical Union","doi":"10.1029/JC092iC09p09531","issn":"01480227","usgsCitation":"Sallenger, A.H., and Holman, R., 1987, Infragravity waves over a natural barred profile: Journal of Geophysical Research Solid Earth, v. 92, no. C9, p. 9531-9540, https://doi.org/10.1029/JC092iC09p09531.","productDescription":"10 p.","startPage":"9531","endPage":"9540","numberOfPages":"10","costCenters":[],"links":[{"id":225471,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"92","issue":"C9","noUsgsAuthors":false,"publicationDate":"2012-09-20","publicationStatus":"PW","scienceBaseUri":"505a3bbce4b0c8380cd627d4","contributors":{"authors":[{"text":"Sallenger, A. H. Jr.","contributorId":8818,"corporation":false,"usgs":true,"family":"Sallenger","given":"A.","suffix":"Jr.","email":"","middleInitial":"H.","affiliations":[],"preferred":false,"id":369405,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Holman, R.A.","contributorId":73751,"corporation":false,"usgs":true,"family":"Holman","given":"R.A.","email":"","affiliations":[],"preferred":false,"id":369406,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70014736,"text":"70014736 - 1987 - Current loops fitted to geomagnetic model spherical harmonic coefficients.","interactions":[],"lastModifiedDate":"2024-04-25T00:08:49.782527","indexId":"70014736","displayToPublicDate":"1987-01-01T00:00:00","publicationYear":"1987","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2310,"text":"Journal of Geomagnetism & Geoelectricity","active":true,"publicationSubtype":{"id":10}},"title":"Current loops fitted to geomagnetic model spherical harmonic coefficients.","docAbstract":"

One hundred-sixty circular current loops with radial axes were fitted by least squares to the 899 spherical harmonic coefficients of a 29th degree model. In the first case, the parameters that were fitted for each loop were the normalized magnetic moment, the distance from the center of the Earth to the current element, the colatitude and E. longitude of the loop axis, and one-half of the central apex angle of the loop. For this case, two of the loops converged near the inner-core outer-core boundary. They accounted for most of the dipolar field. Twenty of the loops, all with much smaller magnetic moments than the two deep loops, converged in the distance range of 0.42 to 0.67 Earth's radius from the center of the Earth. The other 138 loops, after many iterations, were located at distances between 0.81 and 1.0 Earth's radius from the center of the Earth. The loops with radial distances between 0.21 and 0.67 Earth's radius from the center of the Earth are referred to as “core” loops and those at distances greater than 0.81 Earth's radius as “crustal” loops. The spherical harmonic coefficients from these 160 loops, when subtraced from the 899 coefficients of the original model, left a root-mean-square residual of only 0.2nT. A second case was tried which constrained the 138 “crustal” loops to be at 0.996 Earth's radius (25.5km depth). In this case, the root-mean-square residual of the spherical harmonic coefficients from the original model was 0.9nT.

","language":"English","publisher":"J-STAGE","doi":"10.5636/jgg.39.271","usgsCitation":"Alldredge, L., 1987, Current loops fitted to geomagnetic model spherical harmonic coefficients.: Journal of Geomagnetism & Geoelectricity, v. 39, no. 5, p. 271-296, https://doi.org/10.5636/jgg.39.271.","productDescription":"26 p.","startPage":"271","endPage":"296","numberOfPages":"26","costCenters":[],"links":[{"id":480536,"rank":2,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.5636/jgg.39.271","text":"Publisher Index Page"},{"id":226107,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"39","issue":"5","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059fd10e4b0c8380cd4e5fd","contributors":{"authors":[{"text":"Alldredge, L.R.","contributorId":53457,"corporation":false,"usgs":true,"family":"Alldredge","given":"L.R.","email":"","affiliations":[],"preferred":false,"id":369162,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70015282,"text":"70015282 - 1987 - Archean inheritance in zircon from late Paleozoic granites from the Avalon zone of southeastern New England: An African connection","interactions":[],"lastModifiedDate":"2023-12-10T21:22:17.230371","indexId":"70015282","displayToPublicDate":"1987-01-01T00:00:00","publicationYear":"1987","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1427,"text":"Earth and Planetary Science Letters","active":true,"publicationSubtype":{"id":10}},"title":"Archean inheritance in zircon from late Paleozoic granites from the Avalon zone of southeastern New England: An African connection","docAbstract":"

In southeastern New England the Narragansett Pier Granite locally intrudes Carboniferous metasedimentary rocks of the Narragansett basin, and yields a monazite U\"singlePb Permian emplacement age of 273 ± 2Ma. Zircon from the Narragansett Pier Granite contains a minor but detectable amount of an older, inherited component, and shows modern loss of lead. Zircon from the late-stage, aplitic Westerly Granite exhibits a more pronounced lead inheritance —permitting the inherited component to be identified as Late Archean. Such old relict zircon has not been previously recognized in Proterozoic to Paleozoic igneous rocks in New England, and may be restricted to late Paleozoic rocks of the Avalon zone. We suggest that the Archean crustal component reflects an African connection, in which old Archean crust was underplated to the Avalon zone microplate in the late Paleozoic during collision of Gondwanaland with Avalonia.

","language":"English","publisher":"Elsevier","doi":"10.1016/0012-821X(87)90204-4","issn":"0012821X","usgsCitation":"Zartman, R., and Don, H.O., 1987, Archean inheritance in zircon from late Paleozoic granites from the Avalon zone of southeastern New England: An African connection: Earth and Planetary Science Letters, v. 82, no. 3-4, p. 305-315, https://doi.org/10.1016/0012-821X(87)90204-4.","productDescription":"11 p.","startPage":"305","endPage":"315","numberOfPages":"11","costCenters":[],"links":[{"id":224028,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"82","issue":"3-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059ed30e4b0c8380cd496a0","contributors":{"authors":[{"text":"Zartman, R. E.","contributorId":15632,"corporation":false,"usgs":true,"family":"Zartman","given":"R. E.","affiliations":[],"preferred":false,"id":370536,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Don, Hermes O.","contributorId":6594,"corporation":false,"usgs":true,"family":"Don","given":"Hermes","email":"","middleInitial":"O.","affiliations":[],"preferred":false,"id":370535,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70015287,"text":"70015287 - 1987 - Lungfish burrows in the Upper Triassic Chinle and Dolores Formations, Colorado Plateau","interactions":[],"lastModifiedDate":"2024-05-20T23:14:40.393645","indexId":"70015287","displayToPublicDate":"1987-01-01T00:00:00","publicationYear":"1987","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2450,"text":"Journal of Sedimentary Petrology","active":true,"publicationSubtype":{"id":10}},"title":"Lungfish burrows in the Upper Triassic Chinle and Dolores Formations, Colorado Plateau","docAbstract":"

Vertical-to-inclined, cylindrical trace fossils that occur in the Upper Triassic Chinle and Dolores Formations on the Colorado Plateau are interpreted to be the casts of lungfish burrows. The casts, which are as much as 11 cm in diameter and as much as 1.6 m long, were formed by passive silicilastic and carbonate sedimentation into apparently abandoned lungfish burrows. Locally, the burrow fillings are overwhelmingly abundant, and many intersect and have destroyed former burrow fillings. Superposition of bioturbation episodes has obliterated most primary sedimentary structures. This bioturbation has contributed to the mottled coloration and the knobby-weathering texture of the rocks. The burrow-fillings occur ubiquitously in three lithofacies, comprising 1) purple- and white-mottled, silicified sandstone and siltstone, 2) red and brown siltstone and mudstone, and 3) pink and green limestone. These strata were deposited in a continental environment that included fluvial channels and floodplains, sand sheets and playa mudflats, and lacustrine basins, marshes, and deltas. The identification of the trace fossils as the positive casts of lungfish burrows is based on their morphologic similarity to previously identified lungfish burrows and to available hand specimens. The widespread occurrence of the lungfish burrows in the Chinle and Dolores Formations attests to the extensive habitat that supported lungfish in the Late Triassic and to conditions favorable for burrow preservation. Analogy with the environments that support modern lungfish populations suggests that the Late Triassic climate in the study area provided sufficient moisture to support large populations of lungfish and that this climate was probably punctuated by seasonally dry periods.

","language":"English","publisher":"SEPM","doi":"10.1306/212F8B7A-2B24-11D7-8648000102C1865D","issn":"00224472","usgsCitation":"Dubiel, R.F., Blodgett, R., and Bown, T.M., 1987, Lungfish burrows in the Upper Triassic Chinle and Dolores Formations, Colorado Plateau: Journal of Sedimentary Petrology, v. 57, no. 3, p. 512-521, https://doi.org/10.1306/212F8B7A-2B24-11D7-8648000102C1865D.","productDescription":"10 p.","startPage":"512","endPage":"521","numberOfPages":"10","costCenters":[],"links":[{"id":224085,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"57","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a4a9ee4b0c8380cd68ee5","contributors":{"authors":[{"text":"Dubiel, R. F. 0000-0002-1280-0350","orcid":"https://orcid.org/0000-0002-1280-0350","contributorId":41820,"corporation":false,"usgs":true,"family":"Dubiel","given":"R.","email":"","middleInitial":"F.","affiliations":[],"preferred":false,"id":370548,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Blodgett, R.H.","contributorId":48317,"corporation":false,"usgs":true,"family":"Blodgett","given":"R.H.","email":"","affiliations":[],"preferred":false,"id":370549,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Bown, T. M.","contributorId":106858,"corporation":false,"usgs":true,"family":"Bown","given":"T.","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":370550,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70184678,"text":"70184678 - 1987 - [Book review] The geochronology and evolution of Africa","interactions":[],"lastModifiedDate":"2017-03-10T14:57:19","indexId":"70184678","displayToPublicDate":"1987-01-01T00:00:00","publicationYear":"1987","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":"[Book review] The geochronology and evolution of Africa","docAbstract":"

This book was written 'to provide an up-to-date data bank from which those wishing to construct models concerned with the evolution of Africa .... can draw.' As such, it attempts a survey of 'integrated geology and geochronology' of the African continent throughout the Precambrian and into the Phanerozoic. Political and language divisions often hinder the synthesis of continent-wide data, therefore, this well-indexed inventory of selected data and synthesis of present geochronological knowledge for Africa as a whole provides an important reference for researchers and explorationists, many of whom have limited access to complete collections of the geological literature of Africa.

","language":"English","publisher":"Elsevier","doi":"10.1016/0301-9268(87)90090-8","usgsCitation":"Wilson, F.H., 1987, [Book review] The geochronology and evolution of Africa: Precambrian Research, v. 36, no. 2, p. 181-182, https://doi.org/10.1016/0301-9268(87)90090-8.","productDescription":"2 p.","startPage":"181","endPage":"182","costCenters":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true}],"links":[{"id":337397,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"otherGeospatial":"Africa","volume":"36","issue":"2","publicComments":"Review of The geochronology and evolution of Africa: L. Cahen, N.J. Snelling, J. Delhal and J.R. Vail, with the collaboration of M. Bonhomme and D. Ledent. Oxford Univ. Press, Oxford, 1984, xiii+512pp., £60.00 hardcover.","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"58c3c952e4b0f37a93ee9b90","contributors":{"authors":[{"text":"Wilson, Frederic H. 0000-0003-1761-6437 fwilson@usgs.gov","orcid":"https://orcid.org/0000-0003-1761-6437","contributorId":67174,"corporation":false,"usgs":true,"family":"Wilson","given":"Frederic","email":"fwilson@usgs.gov","middleInitial":"H.","affiliations":[{"id":119,"text":"Alaska Science Center Geology Minerals","active":true,"usgs":true},{"id":114,"text":"Alaska Science Center","active":true,"usgs":true}],"preferred":true,"id":682537,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70014839,"text":"70014839 - 1987 - Detection of a locked zone at depth on the Parkfield, California, segment of the San Andreas fault","interactions":[],"lastModifiedDate":"2024-06-05T16:59:27.644069","indexId":"70014839","displayToPublicDate":"1987-01-01T00:00:00","publicationYear":"1987","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":6453,"text":"Journal of Geophysical Research Solid Earth","active":true,"publicationSubtype":{"id":10}},"title":"Detection of a locked zone at depth on the Parkfield, California, segment of the San Andreas fault","docAbstract":"

The Parkfield, California, segment of the San Andreas fault is transitional in character between the creeping segment of the fault to the northwest and the locked Carrizo Plain segment to the southeast. The rate of shallow fault slip decreases from 25–30 mm/yr northwest of the epicenter of the 1966 Parkfield earthquake to zero at the southeastern end of the 1966 rupture zone. Data from a network of trilateration lines spanning the San Andreas fault near Parkfield and extending to the Pacific coast near San Luis Obispo shed light on the rate of fault slip at depth since the 1966 earthquake. In this study, average rates of line length change and shallow fault slip were inverted to determine the slip rate at depth on the Parkfield fault segment. The fault is taken to be a vertical surface with unknown distribution of strike-slip displacement in an elastic half-space. A striking result of the inversions is that all solutions providing acceptable fits to the data exhibit a locked zone essentially coincident with the rupture surface of the 1966 Parkfield earthquake. The data require that the locked zone extend nearly as far north as the 1966 epicenter; however, the vertical extent of the locked zone is not well resolved. Over much of the Parkfield segment the fault is slipping faster at the earth's surface than it is at seismogenic depths. In order to fit the trilateration measurements it is necessary to include a component of contraction normal to the trend of the San Andreas. The inversion results suggest a spatially uniform normal strain of −0.06 μstrain/yr. The orientation of the contraction is compatible with geologic and seismic evidence of active folding and reverse faulting in the region. The magnitude of the contraction is consistent with convergence rates inferred from global plate motion models.

","language":"English","publisher":"American Geophysical Union","doi":"10.1029/JB092iB08p07945","issn":"01480227","usgsCitation":"Harris, R., and Segall, P., 1987, Detection of a locked zone at depth on the Parkfield, California, segment of the San Andreas fault: Journal of Geophysical Research Solid Earth, v. 92, no. B8, p. 7945-7962, https://doi.org/10.1029/JB092iB08p07945.","productDescription":"18 p.","startPage":"7945","endPage":"7962","numberOfPages":"18","costCenters":[],"links":[{"id":225534,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"92","issue":"B8","noUsgsAuthors":false,"publicationDate":"2012-09-20","publicationStatus":"PW","scienceBaseUri":"5059ff6de4b0c8380cd4f1a2","contributors":{"authors":[{"text":"Harris, R.A. 0000-0002-9247-0768","orcid":"https://orcid.org/0000-0002-9247-0768","contributorId":41849,"corporation":false,"usgs":true,"family":"Harris","given":"R.A.","affiliations":[],"preferred":false,"id":369412,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Segall, P.","contributorId":44231,"corporation":false,"usgs":false,"family":"Segall","given":"P.","affiliations":[],"preferred":false,"id":369413,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70185923,"text":"70185923 - 1987 - An empirical model for estimating phytoplankton productivity in estuaries","interactions":[],"lastModifiedDate":"2020-01-17T17:27:17","indexId":"70185923","displayToPublicDate":"1987-01-01T00:00:00","publicationYear":"1987","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2663,"text":"Marine Ecology Progress Series","active":true,"publicationSubtype":{"id":10}},"title":"An empirical model for estimating phytoplankton productivity in estuaries","docAbstract":"

e have previously shown that primary productivity in San Francisco Bay, USA, is highly correlated with phytoplankton biomass B (chlorophyll a concentration) and an index of light avallability in the photic zone, 2, I, (photic depth times surface irradiance). To test the generality of this relation, we compiled data from San Francisco Bay and 5 other USA estuarine systems (Neuse and South Rivers, Puget Sound, Delaware Bay and Hudson River Plume), and regressed daily produclvity J' P (mg C m-2 d-') against the composite parameter B Z, I,. Regressions for each estuary were significant and typically over 80 % of the varialon in P was correlated with variations in B Z,I,. Moreover, the pooled data (n = 211) from 4 estuaries where methodologies were comparable fell along one regression line (r2= 0.82), indicating that primary productivity can be estimated in a diversity of estuarine waters from simple measures of phytoplankton biomass and hght availability. This implies that physiological variabhty (e. g. responses to variations in nutrient availabhty, temperature, sahnity, photoperiod) is a secondary control on phytoplankton production in nutrient-rich estuaries, and that one empirical function can be used to estimate seasonal variations in productivity or to map productivity along estuarine gradients of phytoplankton biomass and turbidity.

","language":"English","publisher":"Inter-Research","usgsCitation":"Cole, B., and Cloern, J., 1987, An empirical model for estimating phytoplankton productivity in estuaries: Marine Ecology Progress Series, v. 396, p. 299-305.","productDescription":"7 p. ","startPage":"299","endPage":"305","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":338665,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"396","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"58dcc822e4b02ff32c68575e","contributors":{"authors":[{"text":"Cole, B.E.","contributorId":66268,"corporation":false,"usgs":true,"family":"Cole","given":"B.E.","email":"","affiliations":[],"preferred":false,"id":687099,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Cloern, J. E.","contributorId":59453,"corporation":false,"usgs":true,"family":"Cloern","given":"J. E.","affiliations":[],"preferred":false,"id":687100,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70014168,"text":"70014168 - 1987 - Transport of reacting solutes subject to a moving dissolution boundary: Numerical methods and solutions","interactions":[],"lastModifiedDate":"2020-01-18T09:41:14","indexId":"70014168","displayToPublicDate":"1987-01-01T00:00:00","publicationYear":"1987","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3722,"text":"Water Resources Research","onlineIssn":"1944-7973","printIssn":"0043-1397","active":true,"publicationSubtype":{"id":10}},"title":"Transport of reacting solutes subject to a moving dissolution boundary: Numerical methods and solutions","docAbstract":"

A moving boundary problem which arises during transport with precipitation-dissolution reactions is solved by three different numerical methods. Two of these methods (one explicit and one implicit) are based on an integral formulation of mass balance and lead to an approximation of a weak solution. These methods are compared to a front-tracking scheme. Although the two approaches are conceptually different, the numerical solutions showed good agreement. As the ratio of dispersion to convection decreases, the methods based on the integral formulation become computationally more efficient. Specific reactions were modeled to examine the dependence of the system on the physical and chemical parameters. Although the water flow rate does not explicitly appear in the equation for the velocity of the moving boundary, the speed of the boundary depends more on the flux rate than on the dispersion coefficient. The discontinuity in the gradient of the solute concentration profile at the boundary increases with convection and with the initial concentration of the mineral. Our implicit method is extended to allow participation of the solutes in complexation reactions as well as the precipitation-dissolution reaction. This extension is easily made and does not change the basic method.

","language":"English","publisher":"American Geophysical Union","doi":"10.1029/WR023i008p01561","usgsCitation":"Willis, C., and Rubin, J., 1987, Transport of reacting solutes subject to a moving dissolution boundary: Numerical methods and solutions: Water Resources Research, v. 23, no. 8, p. 1561-1574, https://doi.org/10.1029/WR023i008p01561.","productDescription":"14 p.","startPage":"1561","endPage":"1574","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":225297,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"23","issue":"8","noUsgsAuthors":false,"publicationDate":"2010-07-09","publicationStatus":"PW","scienceBaseUri":"505ba391e4b08c986b31fd6f","contributors":{"authors":[{"text":"Willis, Catherine","contributorId":42489,"corporation":false,"usgs":true,"family":"Willis","given":"Catherine","email":"","affiliations":[],"preferred":false,"id":367765,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Rubin, Jacob","contributorId":23918,"corporation":false,"usgs":true,"family":"Rubin","given":"Jacob","email":"","affiliations":[],"preferred":false,"id":367764,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70014167,"text":"70014167 - 1987 - Moment tensor solutions estimated using optimal filter theory for 51 selected earthquakes, 1980-1984","interactions":[],"lastModifiedDate":"2013-02-13T13:20:21","indexId":"70014167","displayToPublicDate":"1987-01-01T00:00:00","publicationYear":"1987","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3071,"text":"Physics of the Earth and Planetary Interiors","active":true,"publicationSubtype":{"id":10}},"title":"Moment tensor solutions estimated using optimal filter theory for 51 selected earthquakes, 1980-1984","docAbstract":"The 51 global events that occurred from January 1980 to March 1984, which were chosen by the convenors of the Symposium on Seismological Theory and Practice, have been analyzed using a moment tensor inversion algorithm (Sipkin). Many of the events were routinely analyzed as part of the National Earthquake Information Center's (NEIC) efforts to publish moment tensor and first-motion fault-plane solutions for all moderate- to large-sized (mb>5.7) earthquakes. In routine use only long-period P-waves are used and the source-time function is constrained to be a step-function at the source (??-function in the far-field). Four of the events were of special interest, and long-period P, SH-wave solutions were obtained. For three of these events, an unconstrained inversion was performed. The resulting time-dependent solutions indicated that, for many cases, departures of the solutions from pure double-couples are caused by source complexity that has not been adequately modeled. These solutions also indicate that source complexity of moderate-sized events can be determined from long-period data. Finally, for one of the events of special interest, an inversion of the broadband P-waveforms was also performed, demonstrating the potential for using broadband waveform data in inversion procedures. ?? 1987.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Physics of the Earth and Planetary Interiors","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisher":"Elsevier","publisherLocation":"Amsterdam, Netherlands","doi":"10.1016/0031-9201(87)90068-9","issn":"00319201","usgsCitation":"Sipkin, S., 1987, Moment tensor solutions estimated using optimal filter theory for 51 selected earthquakes, 1980-1984: Physics of the Earth and Planetary Interiors, v. 47, no. C, p. 67-79, https://doi.org/10.1016/0031-9201(87)90068-9.","startPage":"67","endPage":"79","numberOfPages":"13","costCenters":[],"links":[{"id":267329,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/0031-9201(87)90068-9"},{"id":225237,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"47","issue":"C","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a5d3ae4b0c8380cd70242","contributors":{"authors":[{"text":"Sipkin, S.A.","contributorId":9399,"corporation":false,"usgs":true,"family":"Sipkin","given":"S.A.","email":"","affiliations":[],"preferred":false,"id":367763,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70014155,"text":"70014155 - 1987 - Evaluation of the stability of gas hydrates in Northern Alaska","interactions":[],"lastModifiedDate":"2023-09-21T15:26:40.006371","indexId":"70014155","displayToPublicDate":"1987-01-01T00:00:00","publicationYear":"1987","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1264,"text":"Cold Regions Science and Technology","active":true,"publicationSubtype":{"id":10}},"title":"Evaluation of the stability of gas hydrates in Northern Alaska","docAbstract":"

The factors which control the distribution of in situ gas hydrate deposits in colder regions such as Northern Alaska include; mean annual surface temperatures (MAST), geothermal gradients above and below the base of permafrost, subsurface pressures, gas composition, pore-fluid salinity and the soil condition. Currently existing data on the above parameters for the forty-six wells located in Northern Alaska were critically examined and used in calculations of depths and thicknesses of gas hydrate stability zones. To illustrate the effect of gas hydrate stability zones, calculations were done for a variable gas composition using the thermodynamic model of Holder and John (1982). The hydrostatic pressure gradient of 9.84 kPa/m (0.435 lbf/in2ft), the salinity of 10 parts per thousand (ppt) and the coarse-grained soil conditions were assumed. An error analysis was performed for the above parameters and the effect of these parameters on hydrate stability zone calculations were determined.

After projecting the hydrate stability zones for the forty-six wells, well logs were used to identify and to obtain values for the depth and thickness of hydrate zones. Of the forty-six wells, only ten wells showed definite evidence of the presence of gas hydrates.

","language":"English","publisher":"Elsevier","doi":"10.1016/0165-232X(87)90026-7","usgsCitation":"Kamath, A., Godbole, S.P., Ostermann, R.D., and Collett, T.S., 1987, Evaluation of the stability of gas hydrates in Northern Alaska: Cold Regions Science and Technology, v. 14, no. 2, p. 107-119, https://doi.org/10.1016/0165-232X(87)90026-7.","productDescription":"13 p.","startPage":"107","endPage":"119","numberOfPages":"13","costCenters":[],"links":[{"id":226069,"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 -162.35348507096748,\n 71.50417315803796\n ],\n [\n -163.3677789577233,\n 68.05690107968127\n ],\n [\n -145.36017551548042,\n 68.05690107968127\n ],\n [\n -145.36017551548042,\n 70.97000817935472\n ],\n [\n -162.35348507096748,\n 71.50417315803796\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"14","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a0cf3e4b0c8380cd52d6c","contributors":{"authors":[{"text":"Kamath, A.","contributorId":41154,"corporation":false,"usgs":false,"family":"Kamath","given":"A.","email":"","affiliations":[],"preferred":false,"id":367734,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Godbole, S. P.","contributorId":23285,"corporation":false,"usgs":false,"family":"Godbole","given":"S.","email":"","middleInitial":"P.","affiliations":[],"preferred":false,"id":367733,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Ostermann, R. D.","contributorId":42367,"corporation":false,"usgs":false,"family":"Ostermann","given":"R.","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":367735,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Collett, T. S. 0000-0002-7598-4708","orcid":"https://orcid.org/0000-0002-7598-4708","contributorId":86342,"corporation":false,"usgs":true,"family":"Collett","given":"T.","email":"","middleInitial":"S.","affiliations":[],"preferred":false,"id":367736,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70014150,"text":"70014150 - 1987 - Compositional evidence regarding the origins of rims on Semarkona chondrules","interactions":[],"lastModifiedDate":"2024-04-03T16:02:23.697188","indexId":"70014150","displayToPublicDate":"1987-01-01T00:00:00","publicationYear":"1987","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1759,"text":"Geochimica et Cosmochimica Acta","active":true,"publicationSubtype":{"id":10}},"title":"Compositional evidence regarding the origins of rims on Semarkona chondrules","docAbstract":"

The compositions of the interiors and abraded surfaces of 7 chondrules from Semarkona (LL3.0) were measured by neutron activation analysis. For nonvolatile elements, the lithophile and siderophile element abundance patterns in the surfaces are generally similar to those in the corresponding interiors. Siderophile and chalcophile concentrations are much higher in the surfaces, whereas lithophile concentrations are similar in both fractions. Most of the similarities in lithophile patterns and some of the similarities in siderophile patterns between surfaces and interiors may reflect incomplete separation of the fractions in the laboratory, but for 3 or 4 chondrules the siderophile resemblance is inherent, implying that the surface and interior metal formed from a single precursor assemblage. Metal and sulfide-rich chondrule rims probably formed when droplets of these phases that migrated to the chondrule surface during melting were reheated and incorporated into matrix-like material that had accreted onto the surface. The moderately-volatile to volatile elements K, As and Zn tend to be enriched in the surfaces compared with other elements of similar mineral affinity; both enrichments and depletions are observed for other moderately volatile elements. A small fraction of chondrules experienced fractional evaporation while they were molten.

","language":"English","publisher":"Elsevier","doi":"10.1016/0016-7037(87)90373-5","issn":"00167037","usgsCitation":"Grossman, J.N., and Wasson, J.T., 1987, Compositional evidence regarding the origins of rims on Semarkona chondrules: Geochimica et Cosmochimica Acta, v. 51, no. 11, p. 3003-3011, https://doi.org/10.1016/0016-7037(87)90373-5.","productDescription":"9 p.","startPage":"3003","endPage":"3011","numberOfPages":"9","costCenters":[],"links":[{"id":225940,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"51","issue":"11","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059f937e4b0c8380cd4d4d8","contributors":{"authors":[{"text":"Grossman, J. N.","contributorId":41840,"corporation":false,"usgs":true,"family":"Grossman","given":"J.","email":"","middleInitial":"N.","affiliations":[],"preferred":false,"id":367721,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Wasson, J. T.","contributorId":99269,"corporation":false,"usgs":false,"family":"Wasson","given":"J.","email":"","middleInitial":"T.","affiliations":[],"preferred":false,"id":367722,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70014206,"text":"70014206 - 1987 - Assessment of models proposed for the 1985 revision of the international geomagnetic reference field","interactions":[],"lastModifiedDate":"2013-02-13T13:25:52","indexId":"70014206","displayToPublicDate":"1987-01-01T00:00:00","publicationYear":"1987","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3071,"text":"Physics of the Earth and Planetary Interiors","active":true,"publicationSubtype":{"id":10}},"title":"Assessment of models proposed for the 1985 revision of the international geomagnetic reference field","docAbstract":"Geomagnetic measurements from land, marine and aerial surveys conducted in the years 1945-1964 were used to test the 14 models proposed as additions, for that period, to the series of definitive geomagnetic reference field (DGRF) models. Overall, NASA's 'SFAS' models and the BGS (British Geological Survey) models agree best with these data. Comparisons of the two proposed definitive main-field models for 1980.0, with each other and with the existing IGRF 1980 main-field model, show mostly close agreement, with the greatest absolute differences (several tens of nanotesla) occurring in the region of Antarctica. Comparison of the the three proposed forecast secular-variation models for 1985-1990 with estimates of recent rates of change at 148 magnetic observatories shows that the IZMIRAN (U.S.S.R.) and USGS models are in closest agreement with these data. ?? 1987.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Physics of the Earth and Planetary Interiors","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisher":"Elsevier","publisherLocation":"Amsterdam, Netherlands","doi":"10.1016/0031-9201(87)90156-7","issn":"00319201","usgsCitation":"Peddie, N., and Zunde, A., 1987, Assessment of models proposed for the 1985 revision of the international geomagnetic reference field: Physics of the Earth and Planetary Interiors, v. 48, no. 3-4, p. 330-337, https://doi.org/10.1016/0031-9201(87)90156-7.","startPage":"330","endPage":"337","numberOfPages":"8","costCenters":[],"links":[{"id":267334,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/0031-9201(87)90156-7"},{"id":225819,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"48","issue":"3-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059ee41e4b0c8380cd49c61","contributors":{"authors":[{"text":"Peddie, N.W.","contributorId":75911,"corporation":false,"usgs":true,"family":"Peddie","given":"N.W.","affiliations":[],"preferred":false,"id":367856,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Zunde, A.K.","contributorId":21946,"corporation":false,"usgs":true,"family":"Zunde","given":"A.K.","affiliations":[],"preferred":false,"id":367855,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70014109,"text":"70014109 - 1987 - Quaternary silicic pyroclastic deposits of Atitlán Caldera, Guatemala","interactions":[],"lastModifiedDate":"2015-06-02T12:48:28","indexId":"70014109","displayToPublicDate":"1987-01-01T00:00:00","publicationYear":"1987","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2499,"text":"Journal of Volcanology and Geothermal Research","active":true,"publicationSubtype":{"id":10}},"title":"Quaternary silicic pyroclastic deposits of Atitlán Caldera, Guatemala","docAbstract":"

Atitlán caldera has been the site of several silicic eruptions within the last 150,000 years, following a period of basalt/andesite volcanism. The silicic volcanism began with 5–10 km3 of rhyodacites, erupted as plinian fall and pyroclastic flows, about 126,000 yr. B.P. At 85,000 yr. B.P. 270–280 km3 of compositionally distinct rhyolite was erupted in the Los Chocoyos event which produced widely dispersed, plinian fall deposits and widespread, mobile pyroclastic flows. In the latter parts of this eruption rhyodacite and minor dacite were erupted which compositionally resembled the earliest silicic magmas of the Atitlán center. As a result of this major eruption, the modern Atitlán (III) caldera formed. Following this event, rhyodacites were again erupted in smaller (5–13 km3) volumes, partly through the lake, and mafic volcanism resumed, forming three composite volcanoes within the caldera. The bimodal mafic/silicic Atitlán volcanism is similar to that which has occurred elsewhere in the Guatemalan Highlands, but is significantly more voluminous. Mafic lavas are thought to originate in the mantle, but rise, intrude and underplate the lower crust and partly escape to the surface. Eventually, silicic melts form in the crust, possibly partly derived from underplated basaltic material, rise, crystallize and erupt. The renewed mafic volcanism could reflect either regional magmato-tectonic adjustment after the large silicic eruption or the onset of a new cycle.

","language":"English","publisher":"Elsevier","doi":"10.1016/0377-0273(87)90054-0","issn":"03770273","usgsCitation":"Rose, W.I., Newhall, C.G., Bornhorst, T.J., and Self, S., 1987, Quaternary silicic pyroclastic deposits of Atitlán Caldera, Guatemala: Journal of Volcanology and Geothermal Research, v. 33, no. 1-3, p. 57-80, https://doi.org/10.1016/0377-0273(87)90054-0.","productDescription":"24 p.","startPage":"57","endPage":"80","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":487243,"rank":1,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"https://doi.org/10.1016/0377-0273(87)90054-0","text":"External Repository"},{"id":226201,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"33","issue":"1-3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a92d9e4b0c8380cd80aaf","contributors":{"authors":[{"text":"Rose, William I. Jr.","contributorId":71556,"corporation":false,"usgs":true,"family":"Rose","given":"William","suffix":"Jr.","email":"","middleInitial":"I.","affiliations":[],"preferred":false,"id":367601,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Newhall, Christopher G.","contributorId":25557,"corporation":false,"usgs":true,"family":"Newhall","given":"Christopher","email":"","middleInitial":"G.","affiliations":[],"preferred":false,"id":367602,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Bornhorst, Theodore J.","contributorId":68375,"corporation":false,"usgs":true,"family":"Bornhorst","given":"Theodore","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":367600,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Self, Stephen","contributorId":29060,"corporation":false,"usgs":true,"family":"Self","given":"Stephen","affiliations":[],"preferred":false,"id":367603,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70014133,"text":"70014133 - 1987 - Ascaulocardium armatum (Morton 1833), new genus (Late Cretaceous): the ultimate variation on the bivalve paradigm","interactions":[],"lastModifiedDate":"2024-06-21T00:25:58.80679","indexId":"70014133","displayToPublicDate":"1987-01-01T00:00:00","publicationYear":"1987","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2412,"text":"Journal of Paleontology","active":true,"publicationSubtype":{"id":10}},"title":"Ascaulocardium armatum (Morton 1833), new genus (Late Cretaceous): the ultimate variation on the bivalve paradigm","docAbstract":"

Cretaceous clavagellid pelecypods are a poorly known group, and have previously received little study. Ascaulocardium armatum is conchologically the most complex burrowing pelecypod known. From the study of living clavagellids, it is possible to interpret the various tubes extending outward from the adventitious crypt of A. armatum as devices for hydraulic burrowing and deposit feeding. The conchologically complex A. armatum occurs near the beginning of the history of the Clavagellidae, and does not seem to have given rise to any younger species. Ascaulocardium armatum is known only from the Upper Cretaceous rocks (Santonian–Maastrichtian) of the east Gulf and Atlantic Coastal Plains of the United States of America, as is probably the genus Ascaulocardium. All known Cretaceous clavagellids are burrowing species having a free right valve, and this is the ancestral mode of life of the Clavagellidae. Clavagellids that have a boring habit are a more recent evolutionary development, as are burrowing species having both juvenile valves cemented to the crypt. Clavagellids probably evolved from Jurassic–Early Cretaceous pholadomyids. Almost all Cretaceous clavagellids occur outside the Tethyan Zoogeographic Realm; this distribution is in marked contrast to the modern distribution of the family. Living species mostly inhabit clear, shallow seas in subtropical to tropical shelf areas.

","language":"English","publisher":"Paleontological Society","doi":"10.1017/S0022336000061345","issn":"00223360","usgsCitation":"Pojeta, J., and Sohl, N.F., 1987, Ascaulocardium armatum (Morton 1833), new genus (Late Cretaceous): the ultimate variation on the bivalve paradigm: Journal of Paleontology, v. 61, no. 6 Supplement, 77 p., https://doi.org/10.1017/S0022336000061345.","productDescription":"77 p.","numberOfPages":"77","costCenters":[],"links":[{"id":225684,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"61","issue":"6 Supplement","noUsgsAuthors":false,"publicationDate":"2017-08-11","publicationStatus":"PW","scienceBaseUri":"5059edb5e4b0c8380cd4996c","contributors":{"authors":[{"text":"Pojeta, J. Jr.","contributorId":55150,"corporation":false,"usgs":true,"family":"Pojeta","given":"J.","suffix":"Jr.","affiliations":[],"preferred":false,"id":367676,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Sohl, N. F.","contributorId":70029,"corporation":false,"usgs":true,"family":"Sohl","given":"N.","email":"","middleInitial":"F.","affiliations":[],"preferred":false,"id":367677,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70014204,"text":"70014204 - 1987 - The geomagnetic jerk of 1969 and the DGRFs","interactions":[],"lastModifiedDate":"2013-02-13T13:25:01","indexId":"70014204","displayToPublicDate":"1987-01-01T00:00:00","publicationYear":"1987","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3071,"text":"Physics of the Earth and Planetary Interiors","active":true,"publicationSubtype":{"id":10}},"title":"The geomagnetic jerk of 1969 and the DGRFs","docAbstract":"Cubic spline fits to the DGRF/IGRF series indicate agreement with other analyses showing the 1969-1970 magnetic jerk in the h ??12 and g ??02 secular change coefficients, and agreement that the h ??11 term showed no sharp change. The variation of the g ??01 term is out of phase with other analyses indicating a likely error in its representation in the 1965-1975 interval. We recommend that future derivations of the 'definitive' geomagnetic reference models take into consideration the times of impulses or jerks so as to not be bound to a standard 5 year interval, and otherwise to make more considered analyses before adopting sets of coefficients. ?? 1987.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Physics of the Earth and Planetary Interiors","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisher":"Elsevier","publisherLocation":"Amsterdam, Netherlands","doi":"10.1016/0031-9201(87)90163-4","issn":"00319201","usgsCitation":"Thompson, D., and Cain, J., 1987, The geomagnetic jerk of 1969 and the DGRFs: Physics of the Earth and Planetary Interiors, v. 48, no. 3-4, p. 386-388, https://doi.org/10.1016/0031-9201(87)90163-4.","startPage":"386","endPage":"388","numberOfPages":"3","costCenters":[],"links":[{"id":267333,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/0031-9201(87)90163-4"},{"id":225761,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"48","issue":"3-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bac7ee4b08c986b323525","contributors":{"authors":[{"text":"Thompson, D.","contributorId":33678,"corporation":false,"usgs":true,"family":"Thompson","given":"D.","affiliations":[],"preferred":false,"id":367850,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Cain, J.C.","contributorId":68457,"corporation":false,"usgs":true,"family":"Cain","given":"J.C.","email":"","affiliations":[],"preferred":false,"id":367851,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70014127,"text":"70014127 - 1987 - Stochastic simulation of spatially correlated geo-processes","interactions":[],"lastModifiedDate":"2012-03-12T17:19:29","indexId":"70014127","displayToPublicDate":"1987-01-01T00:00:00","publicationYear":"1987","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2700,"text":"Mathematical Geology","active":true,"publicationSubtype":{"id":10}},"title":"Stochastic simulation of spatially correlated geo-processes","docAbstract":"In this study, developments in the theory of stochastic simulation are discussed. The unifying element is the notion of Radon projection in Euclidean spaces. This notion provides a natural way of reconstructing the real process from a corresponding process observable on a reduced dimensionality space, where analysis is theoretically easier and computationally tractable. Within this framework, the concept of space transformation is defined and several of its properties, which are of significant importance within the context of spatially correlated processes, are explored. The turning bands operator is shown to follow from this. This strengthens considerably the theoretical background of the geostatistical method of simulation, and some new results are obtained in both the space and frequency domains. The inverse problem is solved generally and the applicability of the method is extended to anisotropic as well as integrated processes. Some ill-posed problems of the inverse operator are discussed. Effects of the measurement error and impulses at origin are examined. Important features of the simulated process as described by geomechanical laws, the morphology of the deposit, etc., may be incorporated in the analysis. The simulation may become a model-dependent procedure and this, in turn, may provide numerical solutions to spatial-temporal geologic models. Because the spatial simu??lation may be technically reduced to unidimensional simulations, various techniques of generating one-dimensional realizations are reviewed. To link theory and practice, an example is computed in detail. ?? 1987 International Association for Mathematical Geology.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Mathematical Geology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisherLocation":"Kluwer Academic Publishers-Plenum Publishers","doi":"10.1007/BF00893018","issn":"08828121","usgsCitation":"Christakos, G., 1987, Stochastic simulation of spatially correlated geo-processes: Mathematical Geology, v. 19, no. 8, p. 807-831, https://doi.org/10.1007/BF00893018.","startPage":"807","endPage":"831","numberOfPages":"25","costCenters":[],"links":[{"id":205637,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/BF00893018"},{"id":225554,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"19","issue":"8","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b9850e4b08c986b31bf84","contributors":{"authors":[{"text":"Christakos, G.","contributorId":87685,"corporation":false,"usgs":true,"family":"Christakos","given":"G.","email":"","affiliations":[],"preferred":false,"id":367655,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70014852,"text":"70014852 - 1987 - Hydrogeological concepts in the United States: a historical perspective.","interactions":[],"lastModifiedDate":"2013-01-17T20:38:15","indexId":"70014852","displayToPublicDate":"1987-01-01T00:00:00","publicationYear":"1987","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1582,"text":"Episodes","active":true,"publicationSubtype":{"id":10}},"title":"Hydrogeological concepts in the United States: a historical perspective.","docAbstract":"Reviews the development of hydrogeological concepts in the USA from 1879 to 1987, from early qualitative reconnaissance investigations to modern qualitative and multi-disciplinary studies involving predictive analytical techniques and a consideration of management practices. The authors present a sampling of historical milestone papers in US hydrology in the form of an annotated bibliography.-Authors","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Episodes","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","issn":"07053797","usgsCitation":"Moore, J., and Hanshaw, B., 1987, Hydrogeological concepts in the United States: a historical perspective.: Episodes, v. 10, no. 4, p. 315-321.","startPage":"315","endPage":"321","numberOfPages":"7","costCenters":[],"links":[{"id":225665,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":265831,"type":{"id":11,"text":"Document"},"url":"https://www.episodes.co.in/www/backissues/104/ARTICLES--315.pdf"}],"volume":"10","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a340ae4b0c8380cd5f468","contributors":{"authors":[{"text":"Moore, J.E.","contributorId":34927,"corporation":false,"usgs":true,"family":"Moore","given":"J.E.","email":"","affiliations":[],"preferred":false,"id":369450,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Hanshaw, B.B.","contributorId":25928,"corporation":false,"usgs":true,"family":"Hanshaw","given":"B.B.","email":"","affiliations":[],"preferred":false,"id":369449,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70014838,"text":"70014838 - 1987 - Analysis of steady-state salt-water upconing with application at Truro well field, Cape Cod, Massachusetts","interactions":[],"lastModifiedDate":"2024-03-20T22:41:42.557766","indexId":"70014838","displayToPublicDate":"1987-01-01T00:00:00","publicationYear":"1987","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3825,"text":"Groundwater","active":true,"publicationSubtype":{"id":10}},"title":"Analysis of steady-state salt-water upconing with application at Truro well field, Cape Cod, Massachusetts","docAbstract":"

Salt-water upconing describes the phenomenon where salt water is transported vertically upward under a well in response to pumpage in a fresh-water aquifer underlain by salt water. Sharp interface methods have been used successfully to describe the physics of upconing. A finite-element model is developed to simulate a sharp interface for determination of the steady-state position of the interface and maximum permissible well discharges. The model developed is compared to previous published electric-analog model results of Bennett and others (1968). Both methods are applied to a test case at Truro, Massachusetts, where maximum permissible discharges are determined by the finite-element model to range from 0.47 to 1.05 cubic feet per second for the Test Site No. 4 location.

","language":"English","publisher":"National Groundwater Association","doi":"10.1111/j.1745-6584.1987.tb02876.x","issn":"0017467X","usgsCitation":"Reilly, T.E., Frimpter, M., LeBlanc, D., and Goodman, A., 1987, Analysis of steady-state salt-water upconing with application at Truro well field, Cape Cod, Massachusetts: Groundwater, v. 25, no. 2, p. 194-206, https://doi.org/10.1111/j.1745-6584.1987.tb02876.x.","productDescription":"13 p.","startPage":"194","endPage":"206","numberOfPages":"13","costCenters":[],"links":[{"id":225533,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"25","issue":"2","noUsgsAuthors":false,"publicationDate":"2006-03-21","publicationStatus":"PW","scienceBaseUri":"5059eb32e4b0c8380cd48c9f","contributors":{"authors":[{"text":"Reilly, T. E.","contributorId":79460,"corporation":false,"usgs":true,"family":"Reilly","given":"T.","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":369410,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Frimpter, M. H.","contributorId":34127,"corporation":false,"usgs":true,"family":"Frimpter","given":"M. H.","affiliations":[],"preferred":false,"id":369408,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"LeBlanc, D.R.","contributorId":87141,"corporation":false,"usgs":true,"family":"LeBlanc","given":"D.R.","email":"","affiliations":[],"preferred":false,"id":369411,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Goodman, A.S.","contributorId":37901,"corporation":false,"usgs":true,"family":"Goodman","given":"A.S.","email":"","affiliations":[],"preferred":false,"id":369409,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ]}