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Year Published: 2015

Probabilistic 3-D time-lapse inversion of magnetotelluric data: Application to an enhanced geothermal system

Surface-based monitoring of mass transfer caused by injections and extractions in deep boreholes is crucial to maximize oil, gas and geothermal production. Inductive electromagnetic methods, such as magnetotellurics, are appealing for these applications due to their large penetration depths and sensitivity to changes in fluid conductivity and...

Rosas-Carbajal, Marina; Linde, Nicolas; Peacock, Jared R.; Zyserman, F. I.; Kalscheuer, Thomas; Thiel, Stephan

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Year Published: 2015

Porphyry copper assessment of the Tethys region of western and southern Asia: Chapter V in Global mineral resource assessment

A probabilistic mineral resource assessment of undiscovered resources in porphyry copper deposits in the Tethys region of western and southern Asia was carried out as part of a global mineral resource assessment led by the U.S. Geological Survey (USGS). The purpose of the study was to delineate geographic areas as permissive tracts for the...

Zientek, Michael L.; Hammarstrom, Jane M.; Johnson, Kathleen M.; Zürcher, Lukas; Bookstrom, Arthur A.; Hammarstrom, Jane M.; Mars, John C.; Ludington, Stephen; Zientek, Michael L.; Dunlap, Pamela; Wallis, John C.; Drew, Lawrence J.; Sutphin, David M.; Berger, Byron R.; Herrington, Richard J.; Billa, Mario; Kuşcu, Ilkay; Moon, Charles J.; Richards, Jeremy P.
Zürcher, L., Bookstrom A.A., Hammarstrom, J.M., Mars, J.C., Ludington, S., Zientek, M.L., Dunlap, P., and Wallis, J.C., with contributions from Drew, L.J., Sutphin, D.M., Berger, B.R., Herrington, R.J., Billa, M., Kuşcu, I., Moon, C.J. ,and Richards, J.P., 2015, Porphyry copper assessment of the Tethys region of western and southern Asia: U.S. Geological Survey Scientific Investigations Report 2010–5090–V, 232 p., and spatial data, http://dx.doi.org/10.3133/sir20105090V.

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Year Published: 2015

Holocene environmental changes inferred from biological and sedimentological proxies in a high elevation Great Basin lake in the northern Ruby Mountains, Nevada, USA

Multi-proxy analyses were conducted on a sediment core from Favre Lake, a high elevation cirque lake in the northern Ruby Mountains, Nevada, and provide a ca. 7600 year record of local and regional environmental change. Data indicate that lake levels were lower from 7600-5750 cal yr BP, when local climate was warmer and/or drier than today....

Wahl, David B.; Starratt, Scott W.; Anderson, Lysanna; Kusler, Jennifer E.; Fuller, Christopher C.; Addison, Jason A.; Wan, Elmira
Wahl, D., Starratt, S., Anderson, L., Kusler, J., Fuller, C., Addison, J., & Wan, E. (2015). Holocene environmental changes inferred from biological and sedimentological proxies in a high elevation Great Basin lake in the northern Ruby Mountains, Nevada, USA. Quaternary International, 387, 87-98

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Year Published: 2015

Limiting age for the Provo shoreline of Lake Bonneville

Pluvial Lake Bonneville features a prominent shoreline at the Provo level, which has been interpreted as having formed during a period of threshold-stabilized overflow. The timing of Provo shoreline development is important for paleoclimate interpretations and for inferences on geomorphic process rates. Estimates for the timing of the shoreline...

Miller, David M.; Wahl, David B.; McGeehin, John; Rosario, Jose J.; Oviatt, Charles G.; Anderson, Lysanna; Presnetsova, Liubov S.
David M. Miller, David B. Wahl, John P. McGeehin, Jose Rosario, Charles G. Oviatt, Lysanna Anderson, Liubov Presnetsova, Limiting age for the Provo shoreline of Lake Bonneville, Quaternary International, Volume 387, 2015, Pages 99-105, ISSN 1040-6182, http://dx.doi.org/10.1016/j.quaint.2015.01.001. (http://www.sciencedirect.com/science/article/pii/S1040618215000075)

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Year Published: 2015

Imaging the magmatic system of Mono Basin, California with magnetotellurics in three--dimensions

A three–dimensional (3D) electrical resistivity model of Mono Basin in eastern California unveils a complex subsurface filled with zones of partial melt, fluid–filled fracture networks, cold plutons, and regional faults. In 2013, 62 broadband magnetotelluric (MT) stations were collected in an array around southeastern Mono Basin from...

Peacock, Jared R.; Mangan, Margaret T.; McPhee, Darcy K.; Ponce, David A.

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Year Published: 2015

Geologic and geophysical maps of the El Casco 7.5′ quadrangle, Riverside County, southern California, with accompanying geologic-map database

Introduction Earth materials and structures in the El Casco quadrangle provide considerable information about the late Cenozoic geologic evolution of southern California’s Inland Empire region (fig. 2). Important structural and stratigraphic elements include (1) modern traces of the right-lateral San Jacinto Fault zone, (2) older traces of...

Matti, J.C.; Morton, D.M.; Langenheim, V.E.
Matti, J.C., Morton, D.M., and Langenheim, V.E., 2015, Geologic and geophysical maps of the El Casco 7.5′ quadrangle, Riverside County, southern California, with accompanying geologic-map database: U.S. Geological Survey Open-File Report 2010–1274, 141 p., 3 sheets, scale 1:24,000, http://dx.doi.org/10.3133/ofr20101274.

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Year Published: 2015

Arctic Alaska’s Lower Cretaceous (Hauterivian and Barremian) mudstone succession—Linking lithofacies, texture, and geochemistry to marine processes

We present new images and descriptions of the lithofacies and organic facies of the pebble shale unit and lower part of the Hue Shale (Lower Cretaceous) of Arctic Alaska at a high magnification that illustrates their textural characteristics. Our aims were to describe and determine the distribution of facies in these petroleum source rocks and to...

Dumoulin, Julie A.; Keller, Margaret A.; Macquaker, Joe H.S.
Keller, M.A., and Macquaker, J.H.S., 2015, Arctic Alaska’s Lower Cretaceous (Hauterivian and Barremian) mudstone succession—Linking lithofacies, texture, and geochemistry to marine processes, in Dumoulin, J.A., ed., Studies by the U.S. Geological Survey in Alaska, vol. 15: U.S. Geological Survey Professional Paper 1814–B, 35 p., http://dx.doi.org/10.3133/pp1814B.

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Year Published: 2015

Studies by the U.S. Geological Survey in Alaska, Volume 15

Summary Professional Paper 1814—Studies by the U.S. Geological Survey in Alaska, Volume 15—continues a long-running series of collected volumes of U.S. Geological Survey (USGS) scientific reports on Alaska. This series presents new and sometimes preliminary findings that are of interest to Earth and biological scientists in academia,...

Dumoulin, Julie A.
Dumoulin, J.A., ed., 2015, Studies by the U.S. Geological Survey in Alaska, vol. 15: U.S. Geological Survey Professional Paper 1814, http://dx.doi.org/10.3133/pp1814.

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Year Published: 2015

Aeromagnetic survey map of Sacramento Valley, California

Three aeromagnetic surveys were flown to improve understanding of the geology and structure in the Sacramento Valley. The resulting data serve as a basis for geophysical interpretations, and support geological mapping, water and mineral resource investigations, and other topical studies. Local spatial variations in the Earth's magnetic field (...

Langenheim, Victoria E.
Langenheim, V.E., 2015, Aeromagnetic survey map of the Sacramento Valley, California: U.S. Geological Survey Open-File Report 2015–1186, scale 1:400,000, http://dx.doi.org/10.3133/ofr20151186.

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Year Published: 2015

Differentiating induced and natural seismicity using space-time-magnitude statistics applied to the Coso Geothermal field

A remarkable characteristic of earthquakes is their clustering in time and space, displaying their self-similarity. It remains to be tested if natural and induced earthquakes share the same behavior. We study natural and induced earthquakes comparatively in the same tectonic setting at the Coso Geothermal Field. Covering the preproduction and...

Schoenball, Martin; Davatzes, Nicholas C.; Glen, Jonathan M. G.

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Year Published: 2015

Geology of Joshua Tree National Park geodatabase

The database in this Open-File Report describes the geology of Joshua Tree National Park and was completed in support of the National Cooperative Geologic Mapping Program of the U.S. Geological Survey (USGS) and in cooperation with the National Park Service (NPS). The geologic observations and interpretations represented in the database are...

Powell, Robert E.; Matti, Jonathan C.; Cossette, Pamela M.
Powell, R.E., Matti, J.C., Cossette, P.M., 2015, Geology of the Joshua Tree National Park geodatabase: U.S. Geological Survey Open-File Report 2015–1175, GIS database, http://dx.doi.org/10.3133/ofr20151175.

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Year Published: 2015

Crustal-scale tilting of the central Salton block, southern California

The southern San Andreas fault system (California, USA) provides an excellent natural laboratory for studying the controls on vertical crustal motions related to strike-slip deformation. Here we present geologic, geomorphic, and gravity data that provide evidence for active northeastward tilting of the Santa Rosa Mountains and southern Coachella...

Dorsey, Rebecca; Langenheim, Victoria
Dorsey, R.J., and Langenheim, V.E., 2015, Crustal-scale tilting of the central Salton block, southern California: Geosphere, v. 11, no. 5, p. 1–19, doi:10.1130/GES01167.1.