This map is one of a series of seismicity maps produced by the U. S. Geological Survey that show earthquake data of individual states or groups of states at the scale of 1:1,000,000. This map shows only those earthquakes with epicenters located within the boundaries of Indiana, even though earthquakes in nearby states may have been felt or may have caused damage in Indiana.
\nThe data in table 1 were used to compile the seismicity map; these data are a corrected, expanded, and updated (through 1983) version of the data used by Algermissen (1969) for a study of seismic risk in the United States. The locations and intensities of some earthquakes were revised and intensities were assigned where none had been before. Many earthquakes were added to the original list from new data sources as well as from some old data sources that had not been previously used. The data in table 1 represent best estimates of the location of the epicenter, magnitude, and intensity of each earthquake on the basis of historical and current information. Some of the aftershocks from large earthquakes are listed, but not all, especially for earthquakes that occurred before seismic instruments were universally used.
\nThe latitude and longitude coordinates of each epicenter were rounded to the nearest tenth of a degree and sorted so that all identical locations were grouped and counted. These locations are represented on the map by a triangle. The number of earthquakes at each location is shown on the map by the arabic number to the right of the triangle. A Roman numeral to the left of a triangle is the maximum Modified Mercalli intensity (Wood and Neumann, 1931) of all earthquakes at that geographic location. The absence of an intensity value indicates that no intensities have been assigned to earthquakes at that location. The year shown below each triangle is the latest year for which the maximum intensity was recorded.
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1987 - Geology, geochemistry, and mineral resource assessment of the Long Cane Roadless Area, Abbeville County, South Carolina","interactions":[],"lastModifiedDate":"2012-02-10T00:10:13","indexId":"mf1977","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1987","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":"1977","title":"Geology, geochemistry, and mineral resource assessment of the Long Cane Roadless Area, Abbeville County, South Carolina","language":"ENGLISH","doi":"10.3133/mf1977","usgsCitation":"Bell, H., 1987, Geology, geochemistry, and mineral resource assessment of the Long Cane Roadless Area, Abbeville County, South Carolina: U.S. Geological Survey Miscellaneous Field Studies Map 1977, 1 map ;41 x 32 cm., on sheet 81 x 102 cm., folded in envelope 25 x 32 cm., https://doi.org/10.3133/mf1977.","productDescription":"1 map ;41 x 32 cm., on sheet 81 x 102 cm., folded in envelope 25 x 32 cm.","costCenters":[],"links":[{"id":105153,"rank":700,"type":{"id":15,"text":"Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_5548.htm","linkFileType":{"id":5,"text":"html"},"description":"5548"},{"id":184764,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"}],"scale":"0","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -82.36749999999999,34.05 ], [ -82.36749999999999,34.15 ], [ -82.28416666666666,34.15 ], [ -82.28416666666666,34.05 ], [ -82.36749999999999,34.05 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ac9e4b07f02db67c689","contributors":{"authors":[{"text":"Bell, Henry","contributorId":73980,"corporation":false,"usgs":true,"family":"Bell","given":"Henry","affiliations":[],"preferred":false,"id":261123,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":60896,"text":"mf1918 - 1987 - Geologic map of the Black Rock Wilderness Study Area, Graham County, Arizona","interactions":[],"lastModifiedDate":"2012-02-10T00:10:39","indexId":"mf1918","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1987","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":"1918","title":"Geologic map of the Black Rock Wilderness Study Area, Graham County, Arizona","language":"ENGLISH","doi":"10.3133/mf1918","usgsCitation":"Simons, F.S., 1987, Geologic map of the Black Rock Wilderness Study Area, Graham County, Arizona: U.S. Geological Survey Miscellaneous Field Studies Map 1918, 1 map ;41 x 53 cm., on sheet 74 x 102 cm., folded in envelope 25 x 32 cm., https://doi.org/10.3133/mf1918.","productDescription":"1 map ;41 x 53 cm., on sheet 74 x 102 cm., folded in envelope 25 x 32 cm.","costCenters":[],"links":[{"id":105103,"rank":700,"type":{"id":15,"text":"Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_5483.htm","linkFileType":{"id":5,"text":"html"},"description":"5483"},{"id":180336,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"}],"scale":"0","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -110.20083333333334,32.8675 ], [ -110.20083333333334,32.950833333333335 ], [ -110.11749999999999,32.950833333333335 ], [ -110.11749999999999,32.8675 ], [ -110.20083333333334,32.8675 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b0de4b07f02db69f0e0","contributors":{"authors":[{"text":"Simons, F. S.","contributorId":76706,"corporation":false,"usgs":true,"family":"Simons","given":"F.","email":"","middleInitial":"S.","affiliations":[],"preferred":false,"id":264572,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":59379,"text":"mf1913A - 1987 - Mineral resource potential map of the South Sierra Wilderness and the South Sierra Roadless Area, Inyo and Tulare Counties, California","interactions":[],"lastModifiedDate":"2021-10-06T21:36:24.348864","indexId":"mf1913A","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1987","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":"1913","chapter":"A","title":"Mineral resource potential map of the South Sierra Wilderness and the South Sierra Roadless Area, Inyo and Tulare Counties, California","docAbstract":"There are five areas with mineral resource potential and one area with geothermal energy potential in the South Sierra Wilderness and the South Sierra Roadless Area. The area south of Summit Meadows and the area south of Hogback Creek have moderate resource potential for tungsten and molybdenum in small skarn deposits. The area between Summit meadow and Hogback Creek and the area from south of Jackass Meadows to northwest of Granite Knob have low mineral resource potential for tungsten and molybdenum. The area south of and including Walker Creek has low mineral resource potential for lead and zinc. The area including and surrounding Monache Mountain has high geothermal energy resource potential.","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/mf1913A","usgsCitation":"Diggles, M.F., 1987, Mineral resource potential map of the South Sierra Wilderness and the South Sierra Roadless Area, Inyo and Tulare Counties, California: U.S. Geological Survey Miscellaneous Field Studies Map 1913, 1 Plate: 41.01 x 33.69 inches, https://doi.org/10.3133/mf1913A.","productDescription":"1 Plate: 41.01 x 33.69 inches","numberOfPages":"1","additionalOnlineFiles":"Y","costCenters":[{"id":662,"text":"Western Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"links":[{"id":184367,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/mf_1913_a.gif"},{"id":105097,"rank":700,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_5477.htm","linkFileType":{"id":5,"text":"html"},"description":"5477"},{"id":262722,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/mf/1987/1913a/mf1913a.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":262721,"rank":100,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/mf/1987/1913a/","linkFileType":{"id":5,"text":"html"}}],"scale":"48000","datum":"National Geodetic Vertical Datum of 1929","country":"United States","state":"California","county":"Inyo County, Tulare County","otherGeospatial":"South Sierra Wilderness;South Sierra Roadless Area","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -118.25,36 ], [ -118.25,36.25 ], [ -118,36.25 ], [ -118,36 ], [ -118.25,36 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b05e4b07f02db699fb7","contributors":{"authors":[{"text":"Diggles, Michael F. 0000-0002-9946-0247 mdiggles@usgs.gov","orcid":"https://orcid.org/0000-0002-9946-0247","contributorId":810,"corporation":false,"usgs":true,"family":"Diggles","given":"Michael","email":"mdiggles@usgs.gov","middleInitial":"F.","affiliations":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true},{"id":5066,"text":"Office of the Director USGS","active":true,"usgs":true},{"id":501,"text":"Office of Science Quality and Integrity","active":true,"usgs":true},{"id":5053,"text":"IPDS Training","active":true,"usgs":true}],"preferred":true,"id":261889,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":58917,"text":"mf1998 - 1987 - Geologic map of the El Portal Quadrangle, west-central Sierra Nevada, California","interactions":[],"lastModifiedDate":"2012-02-10T00:10:21","indexId":"mf1998","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1987","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":"1998","title":"Geologic map of the El Portal Quadrangle, west-central Sierra Nevada, California","language":"ENGLISH","doi":"10.3133/mf1998","usgsCitation":"Bateman, P.C., and Krauskopf, K., 1987, Geologic map of the El Portal Quadrangle, west-central Sierra Nevada, California: U.S. Geological Survey Miscellaneous Field Studies Map 1998, 1 map ;44 x 35 cm., on sheet 56 x 86 cm., folded in envelope 25 x 32 cm., https://doi.org/10.3133/mf1998.","productDescription":"1 map ;44 x 35 cm., on sheet 56 x 86 cm., folded in envelope 25 x 32 cm.","costCenters":[],"links":[{"id":101812,"rank":700,"type":{"id":15,"text":"Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_32.htm","linkFileType":{"id":5,"text":"html"},"description":"32"},{"id":182911,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"}],"scale":"62500","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -120,37.5 ], [ -120,37.75 ], [ -119.75,37.75 ], [ -119.75,37.5 ], [ -120,37.5 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b03e4b07f02db698e99","contributors":{"authors":[{"text":"Bateman, P. C.","contributorId":27851,"corporation":false,"usgs":true,"family":"Bateman","given":"P.","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":261092,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Krauskopf, K.B.","contributorId":28943,"corporation":false,"usgs":true,"family":"Krauskopf","given":"K.B.","email":"","affiliations":[],"preferred":false,"id":261093,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":58675,"text":"mf2010 - 1987 - Photogeologic and reconnaissance geologic map of the Donleys Reservoir Quadrangle, Rosebud County, Montana","interactions":[],"lastModifiedDate":"2012-02-10T00:10:17","indexId":"mf2010","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1987","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":"2010","title":"Photogeologic and reconnaissance geologic map of the Donleys Reservoir Quadrangle, Rosebud County, Montana","language":"ENGLISH","doi":"10.3133/mf2010","usgsCitation":"Colton, R.B., Klockenbrink, J., Grout, M.A., and Bierbach, P., 1987, Photogeologic and reconnaissance geologic map of the Donleys Reservoir Quadrangle, Rosebud County, Montana: U.S. Geological Survey Miscellaneous Field Studies Map 2010, 1 map ;58 x 40 cm., on sheet 76 x 61 cm., folded in envelope 25 x 32 cm., https://doi.org/10.3133/mf2010.","productDescription":"1 map ;58 x 40 cm., on sheet 76 x 61 cm., folded in envelope 25 x 32 cm.","costCenters":[],"links":[{"id":105174,"rank":700,"type":{"id":15,"text":"Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_5603.htm","linkFileType":{"id":5,"text":"html"},"description":"5603"},{"id":184727,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"}],"scale":"24000","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -107,46.3675 ], [ -107,46.5 ], [ -106.86749999999999,46.5 ], [ -106.86749999999999,46.3675 ], [ -107,46.3675 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4adde4b07f02db686d61","contributors":{"authors":[{"text":"Colton, R. B.","contributorId":40186,"corporation":false,"usgs":true,"family":"Colton","given":"R.","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":260368,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Klockenbrink, J.L.","contributorId":69644,"corporation":false,"usgs":true,"family":"Klockenbrink","given":"J.L.","email":"","affiliations":[],"preferred":false,"id":260369,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Grout, M. A.","contributorId":89143,"corporation":false,"usgs":true,"family":"Grout","given":"M.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":260370,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Bierbach, P.R.","contributorId":100944,"corporation":false,"usgs":true,"family":"Bierbach","given":"P.R.","email":"","affiliations":[],"preferred":false,"id":260371,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":60707,"text":"mf1496D - 1987 - Surface to subsurface cross sections showing correlation of the Dakota Sandstone, Burro Canyon (?) Formation, and upper part of the Morrison Formation in the Chama-El Vado area, Chama Basin, Rio Arriba County, New Mexico","interactions":[],"lastModifiedDate":"2016-08-23T09:19:19","indexId":"mf1496D","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1987","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":"1496","chapter":"D","title":"Surface to subsurface cross sections showing correlation of the Dakota Sandstone, Burro Canyon (?) Formation, and upper part of the Morrison Formation in the Chama-El Vado area, Chama Basin, Rio Arriba County, New Mexico","docAbstract":"This report shows the correlation of the Dakota Sandstone, Burro Canyon(?) Formation, and the upper part of the Morrison Formation in the Chama basin from E1 Cerro dome, just west of Chama, to El Vado Reservoir. Criteria needed to recognize these formations both at the outcrop and in the subsurface is also included.
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reson, VA","doi":"10.3133/mf1496D","isbn":"0607811862","usgsCitation":"Ridgley, J.L., 1987, Surface to subsurface cross sections showing correlation of the Dakota Sandstone, Burro Canyon (?) Formation, and upper part of the Morrison Formation in the Chama-El Vado area, Chama Basin, Rio Arriba County, New Mexico: U.S. Geological Survey Miscellaneous Field Studies Map 1496, 57.53 x 35.67 inches and 55.08 x 37.13 inches, https://doi.org/10.3133/mf1496D.","productDescription":"57.53 x 35.67 inches and 55.08 x 37.13 inches","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":180586,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/mf1496D.PNG"},{"id":327470,"rank":1,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/mf/1496-D/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":327471,"rank":2,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/mf/1496-D/plate-2.pdf","linkFileType":{"id":1,"text":"pdf"}}],"scale":"1","country":"United States","state":"New Mexico","county":"Rio Arriba","otherGeospatial":"Chama Basin","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -106.75,36.65 ], [ -106.75,36.833333333333336 ], [ -106.58333333333333,36.833333333333336 ], [ -106.58333333333333,36.65 ], [ -106.75,36.65 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b00e4b07f02db69822c","contributors":{"authors":[{"text":"Ridgley, Jennie L. ridgley@usgs.gov","contributorId":1248,"corporation":false,"usgs":true,"family":"Ridgley","given":"Jennie","email":"ridgley@usgs.gov","middleInitial":"L.","affiliations":[],"preferred":true,"id":264259,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":60694,"text":"mf1976 - 1987 - Geologic map of the O Bar O Canyon East Quadrangle, Catron County, New Mexico","interactions":[],"lastModifiedDate":"2012-02-10T00:10:19","indexId":"mf1976","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1987","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":"1976","title":"Geologic map of the O Bar O Canyon East Quadrangle, Catron County, New Mexico","language":"ENGLISH","doi":"10.3133/mf1976","usgsCitation":"Richter, D., 1987, Geologic map of the O Bar O Canyon East Quadrangle, Catron County, New Mexico: U.S. Geological Survey Miscellaneous Field Studies Map 1976, 1 map ;58 x 48 cm., on sheet 66 x 96 cm., folded in envelope 30 x 24 cm., https://doi.org/10.3133/mf1976.","productDescription":"1 map ;58 x 48 cm., on sheet 66 x 96 cm., folded in envelope 30 x 24 cm.","costCenters":[],"links":[{"id":105152,"rank":700,"type":{"id":15,"text":"Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_5547.htm","linkFileType":{"id":5,"text":"html"},"description":"5547"},{"id":182897,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"}],"scale":"0","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -108.25,33.5 ], [ -108.25,33.6175 ], [ -108.11749999999999,33.6175 ], [ -108.11749999999999,33.5 ], [ -108.25,33.5 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4afbe4b07f02db696124","contributors":{"authors":[{"text":"Richter, D.H.","contributorId":43325,"corporation":false,"usgs":true,"family":"Richter","given":"D.H.","email":"","affiliations":[{"id":595,"text":"U.S. Geological Survey","active":false,"usgs":true}],"preferred":false,"id":264238,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":60218,"text":"mf1644B - 1987 - Aeromagnetic map of the Hells Gate Roadless Area, Gila County, Arizona","interactions":[],"lastModifiedDate":"2016-08-22T15:33:00","indexId":"mf1644B","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1987","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":"1644","chapter":"B","title":"Aeromagnetic map of the Hells Gate Roadless Area, Gila County, Arizona","docAbstract":"The Hells Gate Roadless Area comprises about 31, 200 acres in the northern part of the Tonto National Forest. It lies beneath the Mogollon Rim between the communities of Payson and Young. The area is roughly a 4 by 15 mi strip along the deeply incised segment of Tonto Creek and along a 2 mi segment of Haigler Creek at its intersection with Tonto Creek. Elevations range from 2,960 ft in the lower Tonto Creek gorge near Gisela, in the southeastern part of the area, to 6,200 ft in the Green Valley Hills, in the northern part of the area. Local relief in the deep canyon of Tonto Creek is commonly greater than 1,000 ft. Hells Gate is the geographic name for the canyon at the confluence of Tonto Creek and Haigler Creek. Foot trails cross Tonto Creek at Hells Gate and between Houston Pocket and McDonald Pocket. Descent into Tonto Creek elsewhere is extremely difficult.
\nThe Hells Gate area lies in the central part of the Tonto Basin, which consists of Tonto Creek and tributaries draining the Mogollon escarpment and the northern Sierra Ancha. These streams dissect a table land which is the unconformable surface at the base of the Paleozoic section and the Mogollon Rim. This tableland is a part of the Colorado Plateau margin, which has been slightly structurally disrupted by late Cenozoic faulting and from which most of the Middle Proterozoic and
\nPaleozoic strata have been stripped by subsequent erosion. Early Proterozoic rocks constitute about ninety percent of the exposed rocks in the roadless area and are composed of granite, granophyre, and intrusive and extrusive rhyolite (Conway, 1983).
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/mf1644B","usgsCitation":"Martin, R., 1987, Aeromagnetic map of the Hells Gate Roadless Area, Gila County, Arizona: U.S. Geological Survey Miscellaneous Field Studies Map 1644, Plate: 41.44 x 31.91 inches, https://doi.org/10.3133/mf1644B.","productDescription":"Plate: 41.44 x 31.91 inches","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":326353,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/mf1644B.JPG"},{"id":327335,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/mf/1644-B/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}}],"scale":"0","country":"United States","state":"Arizona","county":"Gila County","otherGeospatial":"Hells Gate Roadless Area","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -111.36666666666666,34 ], [ -111.36666666666666,34.36666666666667 ], [ -111,34.36666666666667 ], [ -111,34 ], [ -111.36666666666666,34 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4af5e4b07f02db692312","contributors":{"authors":[{"text":"Martin, R.A.","contributorId":53379,"corporation":false,"usgs":true,"family":"Martin","given":"R.A.","email":"","affiliations":[],"preferred":false,"id":263338,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":60376,"text":"mf1960 - 1987 - Geologic map of the east part of the San Francisco Volcanic Field, north-central Arizona","interactions":[],"lastModifiedDate":"2019-02-05T08:57:50","indexId":"mf1960","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1987","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":"1960","title":"Geologic map of the east part of the San Francisco Volcanic Field, north-central Arizona","docAbstract":"The geologic map of the east part of the San Francisco volcanic field (called the East map area) is one of five adjoining geologic maps (fig. 1) prepared under the Geothermal Research Program of the U.S. Geological Survey as a basis for interpreting the history of magmatic activity in the volcanic field. This map is a revision of an earlier one (Moore and Wolfe, 1976). Detail of pyroclastic and alluvial deposits has been reduced for clarity on this uncolored version, and eolian deposits, represented by numerous active dunes of basaltic ash, have been completely omitted. Small cinder cones developed over rootless vents on the basalt flow (Qbb) of = vent 2019 have also been omitted. In addition, a few changes have been made in correlations of flows and vents. The stratigraphic classification has been modified because magnetic-polarity determinations and new K-Ar ages indicate that the physiographically defined Tappan and Woodhouse age groups (Moore and others, 1976) overlap significantly in age, and the rocks of those age groups are now assigned to the Brunhes or Matuyama Polarity Chronozones (Mankinen and Dalrymple, 1979).
The San Francisco field, which is largely Pliocene and Pleistocene in age, is in northern Arizona, just north of the broad transition zone between the Colorado Plateau and the Basin and Range province. It is one of several dominantly basaltic volcanic fields of late Cenozoic age situated near the southern margin of the Colorado Plateau. The East map area encompasses approximately 1,220 km2.
The volcanic field contains rocks ranging in composition from basalt to rhyolite--the products of eruption through Precambrian basement rocks and approximately a kilometer of overlying, nearly horizontal, Paleozoic and Mesozoic sedimentary rocks. About 500 km3 of erupted rocks cover about 5,000 km2 of predominantly Permian and locally preserved Triassic sedimentary rocks that form the erosionally stripped surface of the Colorado Plateau in northern Arizona.
In the East map area, basalt, basaltic andesite and locally associated small dacite domes, and, in a few cases, andesite were extruded from numerous individual vents, each of which presumably erupted briefly and then became inactive. Such short-lived vents, represented mainly by cinder cones or tuff rings, are widely distributed over the map area, and their flows cover much of its surface. However, repeated eruption of andesite, dacite, and rhyolite domes and flows formed the O'Leary Peak eruptive center in the northwest part of the map area, and flows of andesite (Qa1 and Qa2) from the San Francisco Mountain stratovolcano entered the East map area from the west.
A northeastward progression of volcanism during the past 15 m.y., from central Arizona into the San Francisco volcanic field, is shown by the compilation of Luedke and Smith (1978). Although complicated in detail, a general northeastward to eastward progression of volcanic activity is also apparent within the San Francisco volcanic field. Thus, much of the eruptive activity of the East map area occurred late in the development of the San Francisco field, and the East map area includes the youngest volcanic rocks of the field. These youngest rocks were formed during the Sunset Crater eruption, which occurred within the past 1,000 years (Smiley, 1958).
A northeast-trending, faulted monocline occurs near Doney Mountain in the north-central part of the East map area, and a broad north- to northwest-trending anticline occurs at the east edge of the map area. Nearby volcanic rocks are not folded or faulted by either structure.
Northwest-trending normal faults of small throw occur in the southern and northwestern parts of the map area. The faults in the northwestern part transect basalt flows of Matuyama and Brunhes ages (Tmb, Qmb, and Qbb). The volcanic rocks are not faulted elsewhere in the East map area. However, local northwestward elongation and alignment of vent deposits, as shown for example by the fissure deposits of the Sunset Crater eruption (Qbsbf), indicate the presence of a northwest-trending fracture system that apparently localized some of the eruptive feeders.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/mf1960","usgsCitation":"Moore, R.B., and Wolfe, E.W., 1987, Geologic map of the east part of the San Francisco Volcanic Field, north-central Arizona: U.S. Geological Survey Miscellaneous Field Studies Map 1960, Report: 46 p.; 2 Plates: 38.07 x 58.09 inches and 38.52 x 50.01 inches, https://doi.org/10.3133/mf1960.","productDescription":"Report: 46 p.; 2 Plates: 38.07 x 58.09 inches and 38.52 x 50.01 inches","costCenters":[],"links":[{"id":180464,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/mf/1960/report-thumb.jpg"},{"id":105137,"rank":700,"type":{"id":15,"text":"Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_5529.htm","linkFileType":{"id":5,"text":"html"},"description":"5529"},{"id":361001,"rank":3,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/mf/1960/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":361002,"rank":4,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/mf/1960/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":361003,"rank":5,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/mf/1960/plate-2.pdf","linkFileType":{"id":1,"text":"pdf"}}],"scale":"50000","datum":"National Geodetic Vertical Datum of 1929","country":"United States","state":"Arizona","otherGeospatial":"San Francisco volcanic field","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -111.61749999999999,35.134166666666665 ], [ -111.61749999999999,35.6175 ], [ -111.11749999999999,35.6175 ], [ -111.11749999999999,35.134166666666665 ], [ -111.61749999999999,35.134166666666665 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ae3e4b07f02db689190","contributors":{"authors":[{"text":"Moore, Richard B. rmoore@usgs.gov","contributorId":1464,"corporation":false,"usgs":true,"family":"Moore","given":"Richard","email":"rmoore@usgs.gov","middleInitial":"B.","affiliations":[{"id":405,"text":"NH/VT office of New England Water Science Center","active":true,"usgs":true}],"preferred":true,"id":263640,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Wolfe, Edward W.","contributorId":79878,"corporation":false,"usgs":true,"family":"Wolfe","given":"Edward","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":263639,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":58686,"text":"mf2013 - 1987 - Photogeologic and reconnaissance geologic map of the Miller Creek Quadrangle, Custer and Rosebud counties, Montana","interactions":[],"lastModifiedDate":"2012-02-10T00:10:17","indexId":"mf2013","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1987","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":"2013","title":"Photogeologic and reconnaissance geologic map of the Miller Creek Quadrangle, Custer and Rosebud counties, Montana","language":"ENGLISH","doi":"10.3133/mf2013","usgsCitation":"Colton, R.B., Klockenbrink, J., Durst, S., Grout, M.A., Heffern, E., and Bierbach, P., 1987, Photogeologic and reconnaissance geologic map of the Miller Creek Quadrangle, Custer and Rosebud counties, Montana: U.S. Geological Survey Miscellaneous Field Studies Map 2013, 1 map ;58 x 40 cm., on sheet 76 x 61 cm., folded in envelope 25 x 32 cm., https://doi.org/10.3133/mf2013.","productDescription":"1 map ;58 x 40 cm., on sheet 76 x 61 cm., folded in envelope 25 x 32 cm.","costCenters":[],"links":[{"id":105177,"rank":700,"type":{"id":15,"text":"Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_5606.htm","linkFileType":{"id":5,"text":"html"},"description":"5606"},{"id":183932,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"}],"scale":"24000","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -106.11749999999999,46 ], [ -106.11749999999999,46.1175 ], [ -106,46.1175 ], [ -106,46 ], [ -106.11749999999999,46 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4adde4b07f02db686b61","contributors":{"authors":[{"text":"Colton, R. B.","contributorId":40186,"corporation":false,"usgs":true,"family":"Colton","given":"R.","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":260417,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Klockenbrink, J.L.","contributorId":69644,"corporation":false,"usgs":true,"family":"Klockenbrink","given":"J.L.","email":"","affiliations":[],"preferred":false,"id":260418,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Durst, S.L.","contributorId":6788,"corporation":false,"usgs":true,"family":"Durst","given":"S.L.","email":"","affiliations":[],"preferred":false,"id":260416,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Grout, M. A.","contributorId":89143,"corporation":false,"usgs":true,"family":"Grout","given":"M.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":260420,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Heffern, E.L.","contributorId":76400,"corporation":false,"usgs":true,"family":"Heffern","given":"E.L.","email":"","affiliations":[],"preferred":false,"id":260419,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Bierbach, P.R.","contributorId":100944,"corporation":false,"usgs":true,"family":"Bierbach","given":"P.R.","email":"","affiliations":[],"preferred":false,"id":260421,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":58676,"text":"mf2009 - 1987 - Photogeologic and reconnaissance geologic map of the Finch NE Quadrangle, Rosebud County, Montana","interactions":[],"lastModifiedDate":"2012-02-10T00:10:17","indexId":"mf2009","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1987","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":"2009","title":"Photogeologic and reconnaissance geologic map of the Finch NE Quadrangle, Rosebud County, Montana","language":"ENGLISH","doi":"10.3133/mf2009","usgsCitation":"Colton, R.B., Klockenbrink, J., Grout, M.A., Heffern, E., and Bierbach, P., 1987, Photogeologic and reconnaissance geologic map of the Finch NE Quadrangle, Rosebud County, Montana: U.S. Geological Survey Miscellaneous Field Studies Map 2009, 1 map ;58 x 40 cm., on sheet 76 x 61 cm., folded in envelope 25 x 32 cm., https://doi.org/10.3133/mf2009.","productDescription":"1 map ;58 x 40 cm., on sheet 76 x 61 cm., folded in envelope 25 x 32 cm.","costCenters":[],"links":[{"id":105173,"rank":700,"type":{"id":15,"text":"Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_5602.htm","linkFileType":{"id":5,"text":"html"},"description":"5602"},{"id":184828,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"}],"scale":"24000","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -106.86749999999999,0.7675000000000001 ], [ -106.86749999999999,46.3675 ], [ -106.75,46.3675 ], [ -106.75,0.7675000000000001 ], [ -106.86749999999999,0.7675000000000001 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4adde4b07f02db686e9a","contributors":{"authors":[{"text":"Colton, R. B.","contributorId":40186,"corporation":false,"usgs":true,"family":"Colton","given":"R.","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":260372,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Klockenbrink, J.L.","contributorId":69644,"corporation":false,"usgs":true,"family":"Klockenbrink","given":"J.L.","email":"","affiliations":[],"preferred":false,"id":260373,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Grout, M. A.","contributorId":89143,"corporation":false,"usgs":true,"family":"Grout","given":"M.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":260375,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Heffern, E.L.","contributorId":76400,"corporation":false,"usgs":true,"family":"Heffern","given":"E.L.","email":"","affiliations":[],"preferred":false,"id":260374,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Bierbach, P.R.","contributorId":100944,"corporation":false,"usgs":true,"family":"Bierbach","given":"P.R.","email":"","affiliations":[],"preferred":false,"id":260376,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":60228,"text":"mf1984 - 1987 - Maps showing distribution of the Middle Cretaceous unconformity in the eastern Gulf of Mexico","interactions":[],"lastModifiedDate":"2025-05-28T16:11:29.211106","indexId":"mf1984","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1987","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":"1984","title":"Maps showing distribution of the Middle Cretaceous unconformity in the eastern Gulf of Mexico","docAbstract":"Several theories on the origin of the Gulf of Mexico basin have been introduced by various researchers (Beloussov, 1970; Freeland and Dietz, 1971; Malfait and Dinkelman, 1972; Wood and Walper, 1974; Pilger, 1978; Buffler and others, 1980; Dickinson and Coney, 1980; Gose and others, 1980; Schmidt-Effing, 1980; Walper, 1980; Schlager and others, 1984). Although no final agreement has been reached, one prominent geologic feature is generally recognized. The early evolution of the basin ended with a major middle Cretaceous event resulting in a Gulf-wide unconformity referred to as the middle Cretaceous unconformity (MCU). This event represents a major shift from Early Cretaceous shallow-water bank sedimentation to Late Cretaceous deeper water carbonates (Worzel and others, 1973; Mitchum, 1978).
\nSeismic data collected by the U.S. Geological Survey and the University of Texas Marine Science Institute, Galveston Geophysics Laboratory (UTMSI-GGL) were used to map the MCU and its relationship to the deep stratigraphy and structure of the eastern Gulf basin east of long 90° W. In addition, data from the Deep Sea Drilling Project (DSDP) in the southeastern Gulf and along the Campeche Escarpment and dredge samples collected by Schlager and others (1984) from the Florida Escarpment provide an age for the MCU (Cenomanian, 97 m. y. ) and a detailed lithological record.
\nThis report emphasizes the salt diapirs, pillows, and ridges in the northeastern Gulf of Mexico because of the profound effect these geologic structures have on the MCU. Salt locations are shown on the isopach of post-MCU sediments (fig. 1). A second map shows pre-middle Cretaceous outcrops terminated by the MCU along the Florida Escarpment, the southeastern Gulf, and the Campeche Escarpment (fig. 2).
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/mf1984","usgsCitation":"Massingill, L., and Wells, R., 1987, Maps showing distribution of the Middle Cretaceous unconformity in the eastern Gulf of Mexico: U.S. Geological Survey Miscellaneous Field Studies Map 1984, 1 Plate: 57.15 x 39.94 inches, https://doi.org/10.3133/mf1984.","productDescription":"1 Plate: 57.15 x 39.94 inches","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":486643,"rank":3,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_5569.htm","linkFileType":{"id":5,"text":"html"}},{"id":327343,"rank":2,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/mf/1984/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":183120,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/mf1984.PNG"}],"otherGeospatial":"Gulf of Mexico","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -90,23 ], [ -90,31 ], [ -80,31 ], [ -80,23 ], [ -90,23 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a19e4b07f02db6057b0","contributors":{"authors":[{"text":"Massingill, L.M.","contributorId":59047,"corporation":false,"usgs":true,"family":"Massingill","given":"L.M.","email":"","affiliations":[],"preferred":false,"id":263349,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Wells, R.H.","contributorId":63020,"corporation":false,"usgs":true,"family":"Wells","given":"R.H.","email":"","affiliations":[],"preferred":false,"id":263350,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":60897,"text":"mf1919 - 1987 - Geologic map of the Fishhooks Wilderness Study Area, Graham County, Arizona","interactions":[],"lastModifiedDate":"2012-02-10T00:10:39","indexId":"mf1919","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1987","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":"1919","title":"Geologic map of the Fishhooks Wilderness Study Area, Graham County, Arizona","language":"ENGLISH","doi":"10.3133/mf1919","usgsCitation":"Simons, F.S., 1987, Geologic map of the Fishhooks Wilderness Study Area, Graham County, Arizona: U.S. Geological Survey Miscellaneous Field Studies Map 1919, 1 map ;52 x 48 cm., on sheet 81 x 117 cm., folded in envelope 25 x 32 cm., https://doi.org/10.3133/mf1919.","productDescription":"1 map ;52 x 48 cm., on sheet 81 x 117 cm., folded in envelope 25 x 32 cm.","costCenters":[],"links":[{"id":105104,"rank":700,"type":{"id":15,"text":"Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_5484.htm","linkFileType":{"id":5,"text":"html"},"description":"5484"},{"id":180337,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"}],"scale":"0","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -110.03416666666666,33.166666666666664 ], [ -110.03416666666666,33.25 ], [ -109.95083333333334,33.25 ], [ -109.95083333333334,33.166666666666664 ], [ -110.03416666666666,33.166666666666664 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b04e4b07f02db69957d","contributors":{"authors":[{"text":"Simons, F. S.","contributorId":76706,"corporation":false,"usgs":true,"family":"Simons","given":"F.","email":"","middleInitial":"S.","affiliations":[],"preferred":false,"id":264573,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":59489,"text":"mf1926 - 1987 - Geologic map of the Owyhee Canyon Wilderness Study Area, Malheur County, Oregon","interactions":[],"lastModifiedDate":"2012-02-10T00:10:23","indexId":"mf1926","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1987","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":"1926","title":"Geologic map of the Owyhee Canyon Wilderness Study Area, Malheur County, Oregon","language":"ENGLISH","doi":"10.3133/mf1926","usgsCitation":"Evans, J.G., 1987, Geologic map of the Owyhee Canyon Wilderness Study Area, Malheur County, Oregon: U.S. Geological Survey Miscellaneous Field Studies Map 1926, 1 map ;133 x 82 cm., on sheet 144 x 87 cm., folded in envelope 25 x 32 cm., https://doi.org/10.3133/mf1926.","productDescription":"1 map ;133 x 82 cm., on sheet 144 x 87 cm., folded in envelope 25 x 32 cm.","costCenters":[],"links":[{"id":105109,"rank":700,"type":{"id":15,"text":"Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_5492.htm","linkFileType":{"id":5,"text":"html"},"description":"5492"},{"id":182934,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"}],"scale":"0","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -117.58333333333333,42.083333333333336 ], [ -117.58333333333333,42.833333333333336 ], [ -117,42.833333333333336 ], [ -117,42.083333333333336 ], [ -117.58333333333333,42.083333333333336 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4af6e4b07f02db692c0d","contributors":{"authors":[{"text":"Evans, J. G.","contributorId":60214,"corporation":false,"usgs":true,"family":"Evans","given":"J.","email":"","middleInitial":"G.","affiliations":[],"preferred":false,"id":262104,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":59381,"text":"mf1875 - 1987 - Map showing locations and statistical parameters of beach and offshore sand samples, Tutuila Island, American Samoa","interactions":[],"lastModifiedDate":"2016-08-22T10:24:14","indexId":"mf1875","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1987","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":"1875","title":"Map showing locations and statistical parameters of beach and offshore sand samples, Tutuila Island, American Samoa","docAbstract":"In April 1985, sand samples were collected from many of the beaches on Tutuila Island, American Samoa, and in July 1985, three bays were surveyed using side-scan sonar and shallow seismic profiling. During that second trip, scuba divers collected sand samples from the surveyed areas. Dingler and others (1986) describes the study; this report presents the grain-size and composition data for the onshore and offshore sand samples. Locations of the onshore samples are plotted on the map of the island, which is reproduced from Normark and others (1985); locations of most of the offshore samples and side-scan sonar interpretations made during the study are plotted on enlargements (A and B, respectively) of Fagaitua and Nua-seetaga Bays. Lam Yuen (1981), U.S. Army Corps of Engineers (1980), and Sea Engineering Services Inc. (1980) provide additional information pertaining to the island's beaches.
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/mf1875","usgsCitation":"Dingler, J., Carlson, D., and Sallenger, A., 1987, Map showing locations and statistical parameters of beach and offshore sand samples, Tutuila Island, American Samoa: U.S. Geological Survey Miscellaneous Field Studies Map 1875, Plate: 50.46 x 35.06 inches, https://doi.org/10.3133/mf1875.","productDescription":"Plate: 50.46 x 35.06 inches","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":326121,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/mf1875.JPG"},{"id":327210,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/mf/1875/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}}],"scale":"0","country":"American Samoa","otherGeospatial":"Tutuila Island","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -170.85,14.216666666666667 ], [ -170.85,14.4 ], [ -170.53333333333333,14.4 ], [ -170.53333333333333,14.216666666666667 ], [ -170.85,14.216666666666667 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a94e4b07f02db65899a","contributors":{"authors":[{"text":"Dingler, J.R.","contributorId":64247,"corporation":false,"usgs":true,"family":"Dingler","given":"J.R.","email":"","affiliations":[],"preferred":false,"id":261892,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Carlson, D.V.","contributorId":87210,"corporation":false,"usgs":true,"family":"Carlson","given":"D.V.","email":"","affiliations":[],"preferred":false,"id":261894,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Sallenger, A. H.","contributorId":78290,"corporation":false,"usgs":true,"family":"Sallenger","given":"A. H.","affiliations":[],"preferred":false,"id":261893,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":58709,"text":"mf1971 - 1987 - Preliminary geologic map of northern Wilson Creek Range, Lincoln County, Nevada","interactions":[],"lastModifiedDate":"2012-02-10T00:10:17","indexId":"mf1971","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1987","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":"1971","title":"Preliminary geologic map of northern Wilson Creek Range, Lincoln County, Nevada","language":"ENGLISH","doi":"10.3133/mf1971","usgsCitation":"Willis, J., Best, M.G., Kowallis, B.J., and Best, V., 1987, Preliminary geologic map of northern Wilson Creek Range, Lincoln County, Nevada: U.S. Geological Survey Miscellaneous Field Studies Map 1971, 1 map ;56 x 44 cm., on sheet 76 x 122 cm., folded in envelope 25 x 32 cm., https://doi.org/10.3133/mf1971.","productDescription":"1 map ;56 x 44 cm., on sheet 76 x 122 cm., folded in envelope 25 x 32 cm.","costCenters":[],"links":[{"id":105149,"rank":700,"type":{"id":15,"text":"Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_5542.htm","linkFileType":{"id":5,"text":"html"},"description":"5542"},{"id":184624,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"}],"scale":"50000","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -114.5,38.25 ], [ -114.5,38.5 ], [ -114.25,38.5 ], [ -114.25,38.25 ], [ -114.5,38.25 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b04e4b07f02db699274","contributors":{"authors":[{"text":"Willis, J.B.","contributorId":21620,"corporation":false,"usgs":true,"family":"Willis","given":"J.B.","email":"","affiliations":[],"preferred":false,"id":260520,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Best, M. G.","contributorId":57843,"corporation":false,"usgs":true,"family":"Best","given":"M.","email":"","middleInitial":"G.","affiliations":[],"preferred":false,"id":260521,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Kowallis, B. J.","contributorId":60717,"corporation":false,"usgs":true,"family":"Kowallis","given":"B.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":260522,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Best, V.C.","contributorId":12907,"corporation":false,"usgs":true,"family":"Best","given":"V.C.","email":"","affiliations":[],"preferred":false,"id":260519,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":60995,"text":"mf1280 - 1987 - Seismicity map of the state of Pennsylvania","interactions":[{"subject":{"id":70187610,"text":"mf1280_1981 - 1981 - Seismicity map of the state of Pennsylvania","indexId":"mf1280_1981","publicationYear":"1981","noYear":false,"title":"Seismicity map of the state of Pennsylvania"},"predicate":"SUPERSEDED_BY","object":{"id":60995,"text":"mf1280 - 1987 - Seismicity map of the state of Pennsylvania","indexId":"mf1280","publicationYear":"1987","noYear":false,"title":"Seismicity map of the state of Pennsylvania"},"id":1}],"lastModifiedDate":"2023-05-01T21:22:50.313426","indexId":"mf1280","displayToPublicDate":"1987-01-01T00:00:00","publicationYear":"1987","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":"1280","title":"Seismicity map of the state of Pennsylvania","docAbstract":"This map is one of a series of seismicity maps produced by the U. S. Geological Survey that show earthquake data of individual states or groups of states at the scale of 1:1,000,000. This map shows only those earthquakes with epicenters located within the boundaries of Pennsylvania, even though earthquakes in nearby states may have been felt or may have caused damage in Pennsylvania.
The data in table 1 were used to compile the seismicity map; these data are a corrected, expanded, and updated (through 1983) version of the data used by Algermissen (1969) for a study of seismic risk in the United States. The locations and intensities of some earthquakes were revised and intensities were assigned where none had been before. Many earthquakes were added to the original list from new data sources as well as from some old data sources that had not been previously used. The data in table 1 represent best estimates of the location of the epicenter, magnitude, and intensity of each earthquake on the basis of historical and current information. Some of the aftershocks from large earthquakes are listed, but not all, especially for earthquakes that occurred before seismic instruments were universally used.
The latitude and longitude coordinates of each epicenter were rounded to the nearest tenth of a degree and sorted so that all identical locations were grouped and counted. These locations are represented on the map by a triangle. The number of earthquakes at each location is shown on the map by the arabic number to the right of the triangle. A Roman numeral to the left of a triangle is the maximum Modified Mercalli intensity (Wood and Neumann, 1931) of a11 earthquakes at that geographic location. The absence of an intensity value indicates that no intensities have been assigned to earthquakes at that location. The year shown below each triangle is the latest year for which the maximum intensity was recorded.
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