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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.

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Year Published: 2015

Plugs or flood-makers? the unstable landslide dams of eastern Oregon

Landslides into valley bottoms can affect longitudinal profiles of rivers, thereby influencing landscape evolution through base-level changes. Large landslides can hinder river incision by temporarily damming rivers, but catastrophic failure of landslide dams may generate large floods that could promote incision. Dam stability therefore strongly...

Safran, Elizabeth B.; O'Connor, Jim E.; Ely, Lisa L.; House, P. Kyle; Grant, Gordon E.; Harrity, Kelsey; Croall, Kelsey; Jones, Emily

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Year Published: 2015

Assessment of existing and potential landslide hazards resulting from the April 25, 2015 Gorkha, Nepal earthquake sequence

Introduction On April 25, 2015, a large (M7.8) earthquake shook much of central Nepal and was followed by a series of M>6 aftershocks, including a M7.3 event on May 12, 2015. This earthquake and aftershocks, referred to as the “Gorkha earthquake sequence,” caused thousands of fatalities, damaged and destroyed entire villages, and...

Collins, Brian D.; Jibson, Randall W.
Collins, B.D., and Jibson, R.W., 2015, Assessment of existing and potential landslide hazards resulting from the April 25, 2015 Gorkha, Nepal earthquake sequence (ver. 1.1, August 2015): U.S. Geological Survey Open-File Report 2015–1142, 50 p., http://dx.doi.org/10.3133/ofr20151142.

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Year Published: 2015

Phosphate occurrence and potential in the region of Afghanistan, including parts of China, Iran, Pakistan, Tajikistan, Turkmenistan, and Uzbekistan

As part of a larger study, the U.S. Geological Survey undertook a study to identify the potential for phosphate deposits in Afghanistan. As part of this study, a geographic information system was constructed containing a database of phosphate occurrences in Afghanistan and adjacent countries, and a database of potential host lithologies compiled...

Orris, Greta J.; Dunlap, Pamela; Wallis, John; Wynn, Jeff
Orris, G.J., Dunlap, Pamela, and Wallis, J.C., 2015, Phosphate occurrence and potential in the region of Afghanistan, including parts of China, Iran, Pakistan, Tajikistan, Turkmenistan, and Uzbekistan, with a section on geophysics by Jeff Wynn: U.S. Geological Survey Open-File Report 2015-1121, 70 p., http://dx.doi.org/10.3133/ofr20151121.

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Year Published: 2015

Early Holocene Great Salt Lake

Shorelines and surficial deposits (including buried forest-floor mats and organic-rich wetland sediments) show that Great Salt Lake did not rise higher than modern lake levels during the earliest Holocene (11.5–10.2 cal ka BP; 10–9 14C ka BP). During that period, finely laminated, organic-rich muds (sapropel) containing brine-shrimp cysts and...

Oviatt, Charles G.; Madsen, David B.; Miller, David M.; Thompson, Robert S.; McGeehin, John P.
Oviatt, C.G., Madsen, D.B., Miller, D.M., Thompson, R.S., and McGeehin, J.P., 2015, Early Holocene Great Salt Lake, USA: Quaternary Research, v. 84, p. 57-68. [doi:10.1016/j.yqres.2015.05.001]

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Year Published: 2015

Paleodischarge of the Mojave River, southwestern U.S.A, investigated with single-pebble measurements of 10Be

The paleohydrology of ephemeral stream systems is an important constraint on paleoclimatic conditions in arid environments, but remains difficult to constrain quantitatively. For example, sedimentary records of the size and extent of pluvial lakes in the Mojave Desert have been used as a proxy for Quaternary climate variability. Although the...

Cyr, Andrew J.; Miller, David M.; Mahan, Shannon A.