Publications
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Quantifying the heterogeneity of the tectonic stress field using borehole data
The heterogeneity of the tectonic stress field is a fundamental property which influences earthquake dynamics and subsurface engineering. Self-similar scaling of stress heterogeneities is frequently assumed to explain characteristics of earthquakes such as the magnitude-frequency relation. However, observational evidence for such scaling of the stress field heterogeneity is scarce.We analyze the l
Authors
Martin Schoenball, Nicholas C. Davatzes
Spatiotemporal analysis of changes in lode mining claims around the McDermitt Caldera, northern Nevada and southern Oregon
Resource managers and agencies involved with planning for future federal land needs are required to complete an assessment of and forecast for future land use every ten years. Predicting mining activities on federal lands is difficult as current regulations do not require disclosure of exploration results. In these cases, historic mining claims may serve as a useful proxy for determining where min
Authors
Joshua A. Coyan, Michael L. Zientek, Mark J. Mihalasky
Microbial survival strategies in ancient permafrost: insights from metagenomics
In permafrost (perennially frozen ground) microbes survive oligotrophic conditions, sub-zero temperatures, low water availability and high salinity over millennia. Viable life exists in permafrost tens of thousands of years old but we know little about the metabolic and physiological adaptations to the challenges presented by life in frozen ground over geologic time. In this study we asked whether
Authors
Rachel Mackelprang, Alexander Burkert, Monica Haw, Tara Mahendrarajah, Christopher H. Conaway, Thomas A. Douglas, Mark P. Waldrop
The interacting roles of climate, soils, and plant production on soil microbial communities at a continental scale
Soil microbial communities control critical ecosystem processes such as decomposition, nutrient cycling, and soil organic matter formation. Continental scale patterns in the composition and functioning of microbial communities are related to climatic, biotic, and edaphic factors such as temperature and precipitation, plant community composition, and soil carbon, nitrogen, and pH. Although these re
Authors
Mark P. Waldrop, JoAnn M. Holloway, David B. Smith, Martin B. Goldhaber, R. E. Drenovsky, K. M. Scow, R. Dick, Daniel M. Howard, Bruce K. Wylie, James B. Grace
By
Ecosystems Mission Area, Energy and Minerals Mission Area, Climate Research and Development Program, Energy Resources Program, Land Change Science Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Earth Resources Observation and Science (EROS) Center , Geology, Minerals, Energy, and Geophysics Science Center, Wetland and Aquatic Research Center
10Be dating of late Pleistocene megafloods and Cordilleran Ice Sheet retreat in the northwestern United States
During the late Pleistocene, multiple floods from drainage of glacial Lake Missoula further eroded a vast anastomosing network of bedrock channels, coulees, and cataracts, forming the Channeled Scabland of eastern Washington State (United States). However, the timing and exact pathways of these Missoula floods remain poorly constrained, thereby limiting our understanding of the evolution of this s
Authors
Andrea M. Balbas, Aaron M. Barth, Peter U. Clark, Jorie Clark, Marc A. Caffee, Jim E. O'Connor, Victor R. Baker, Kevin Konrad, Bruce Bjornstad
Active tectonics of the northern Mojave Desert: The 2017 Desert Symposium field trip road log
The 2017 Desert Symposium field trip will highlight recent work by the U.S. Geological Survey geologists and geophysicists, who have been mapping young sediment and geomorphology associated with active tectonic features in the least well-known part of the eastern California Shear Zone (ECSZ). This area, stretching from Barstow eastward in a giant arc to end near the Granite Mountains on the south
Authors
David M. Miller, R.E. Reynolds, Geoffrey Phelps, Jeffrey S. Honke, Andrew J. Cyr, David C. Buesch, Kevin M. Schmidt, G. Losson
The Neogene genus Streptochilus (Brönnimann and Resig, 1971) from the Gulf of California
Four species of the planktonic foraminiferal genus Streptochilus from key Neogene marine localities are documented in relation to the evolution of the Gulf of California: S. globigerus, S. latus, S. macdougallae sp. nov., and S. inglei sp. nov. Planktonic foraminiferal bioevents and strontium isotopes in the Bouse, Tirabuzón, Carmen and Ojo de Buey lithostratigraphic units constrain the local dist
Authors
A.Y. Miranda Martínez, A.L. Carreño, Kristin McDougall
Regional and temporal variability of melts during a Cordilleran magma pulse: Age and chemical evolution of the jurassic arc, eastern mojave desert, California
Intrusive rock sequences in the central and eastern Mojave Desert segment of the Jurassic Cordilleran arc of the western United States record regional and temporal variations in magmas generated during the second prominent pulse of Mesozoic continental arc magmatism. U/Pb zircon ages provide temporal control for describing variations in rock and zircon geochemistry that reflect differences in magm
Authors
A.P. Barth, J.L. Wooden, David M. Miller, Keith A. Howard, Lydia Fox, Elizabeth R. Schermer, C.E. Jacobson
Re-Os systematics and geochemistry of cobaltite (CoAsS) in the Idaho cobalt belt, Belt-Purcell Basin, USA: Evidence for middle Mesoproterozoic sediment-hosted Co-Cu sulfide mineralization with Grenvillian and Cretaceous remobilization
We report the first study of the Re-Os systematics of cobaltite (CoAsS) using disseminated grains and massive sulfides from samples of two breccia-type and two stratabound deposits in the Co-Cu-Au Idaho cobalt belt (ICB), Lemhi subbasin to the Belt-Purcell Basin, Idaho, USA. Using a 185Re + 190Os spike solution, magnetic and non-magnetic fractions of cobaltite mineral separates give reproducible R
Authors
N.J. Saintilan, R.A. Creaser, Arthur A. Bookstrom
Assessing changes in the physico-chemical properties and fluoride adsorption capacity of activated alumina under varied conditions
Adsorption using activated alumina is a simple method for removing fluoride from drinking water, but to be cost effective the adsorption capacity must be high and effective long-term. The intent of this study was to assess changes in its adsorption capacity under varied conditions. This was determined by evaluating the physico-chemical properties, surface charge, and fluoride (F−) adsorption capac
Authors
Laura Craig, Lisa L. Stillings, David L. Decker
Cascadia subduction tremor muted by crustal faults
Deep, episodic slow slip on the Cascadia subduction megathrust of western North America is accompanied by low-frequency tremor in a zone of high fluid pressure between 30 and 40 km depth. Tremor density (tremor epicenters per square kilometer) varies along strike, and lower tremor density statistically correlates with upper plate faults that accommodate northward motion and rotation of forearc blo
Authors
Ray Wells, Richard J. Blakely, Aaron G. Wech, Patricia A. McCrory, Andrew Michael
By
Energy and Minerals Mission Area, Natural Hazards Mission Area, Earthquake Hazards Program, Energy Resources Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Earthquake Science Center, Geology, Minerals, Energy, and Geophysics Science Center, Subduction Zone Science
The Evergreen basin and the role of the Silver Creek fault in the San Andreas fault system, San Francisco Bay region, California
The Evergreen basin is a 40-km-long, 8-km-wide Cenozoic sedimentary basin that lies mostly concealed beneath the northeastern margin of the Santa Clara Valley near the south end of San Francisco Bay (California, USA). The basin is bounded on the northeast by the strike-slip Hayward fault and an approximately parallel subsurface fault that is structurally overlain by a set of west-verging reverse-o
Authors
Robert C. Jachens, Carl M. Wentworth, Russell W. Graymer, Robert Williams, David A. Ponce, Edward A. Mankinen, William J. Stephenson, Victoria E. Langenheim