Buried shallow fault slip from the South Napa earthquake revealed by near-field geodesy
Benjamin A. Brooks, Sarah E. Minson, Craig L. Glennie, Johanna Nevitt, Timothy E. Dawson, Ron S. Rubin, Todd Ericksen, David A. Lockner, Kenneth W. Hudnut, Victoria E. Langenheim, Andrew Lutz, Jessica R. Murray, David P. Schwartz, Dana Zaccone
2017, Science Advances (3)
Earthquake-related fault slip in the upper hundreds of meters of Earth’s surface has remained largely unstudied because of challenges measuring deformation in the near field of a fault rupture. We analyze centimeter-scale accuracy mobile laser scanning (MLS) data of deformed vine rows within ±300 m of the principal surface expression...
Spatially explicit population estimates for black bears based on cluster sampling
J. Humm, J. Walter McCown, B.K. Scheick, Joseph D. Clark
2017, Journal of Wildlife Management (81) 1187-1201
We estimated abundance and density of the 5 major black bear (Ursus americanus) subpopulations (i.e., Eglin, Apalachicola, Osceola, Ocala-St. Johns, Big Cypress) in Florida, USA with spatially explicit capture-mark-recapture (SCR) by extracting DNA from hair samples collected at barbed-wire hair sampling sites. We employed a clustered sampling configuration with sampling...
Systematic observations of the slip pulse properties of large earthquake ruptures
Diego Melgar, Gavin P. Hayes
2017, Geophysical Research Letters (44) 9691-9698
In earthquake dynamics there are two end member models of rupture: propagating cracks and self-healing pulses. These arise due to different properties of faults and have implications for seismic hazard; rupture mode controls near-field strong ground motions. Past studies favor the pulse-like mode of rupture; however, due to a variety...
Delayed seismicity rate changes controlled by static stress transfer
Kayla A. Kroll, Keith B. Richards-Dinger, James H. Dieterich, Elizabeth S. Cochran
2017, Journal of Geophysical Research B: Solid Earth (122) 7951-7965
On 15 June 2010, a Mw5.7 earthquake occurred near Ocotillo, California, in the Yuha Desert. This event was the largest aftershock of the 4 April 2010 Mw7.2 El Mayor-Cucapah (EMC) earthquake in this region. The EMC mainshock and subsequent Ocotillo aftershock provide an opportunity to test the Coulomb failure hypothesis (CFS). We...
Strong SH-to-Love wave scattering off the Southern California Continental Borderland
Chunquan Yu, Zhongwen Zhan, Egill Hauksson, Elizabeth S. Cochran
2017, Geophysical Research Letters (44) 10208-10215
Seismic scattering is commonly observed and results from wave propagation in heterogeneous medium. Yet, deterministic characterization of scatterers associated with lateral heterogeneities remains challenging. In this study, we analyze broadband waveforms recorded by the Southern California Seismic Network and observe strongly scattered Love waves following the arrival of teleseismic SH...
Shear-wave velocity model from Rayleigh wave group velocities centered on the Sacramento/San Joaquin Delta
Jon Peter B. Fletcher, Jemile Erdem
2017, Pure and Applied Geophysics (174) 3825-3839
Rayleigh wave group velocities obtained from ambient noise tomography are inverted for an upper crustal model of the Central Valley, California, centered on the Sacramento/San Joaquin Delta. Two methods were tried; the first uses SURF96, a least-squares routine. It provides a good fit to the data, but convergence is dependent...
Selective transport of palynomorphs in marine turbiditic deposits: An example from the Ascension-Monterey Canyon system offshore central California
Mary McGann
2017, Quaternary International (469) 120-140
The pollen assemblage of a deep-sea core (15G) collected at lower bathyal depths (3491 m) on a levee of Monterey Canyon off central California was investigated to gain insights into the delivery processes of terrigenous material to submarine fans and the effect this transport has on the palynological record. Thirty-two...
Quantile regression applications in ecology and the environmental sciences
Brian S. Cade
Roger Koenker, Victor Chernozhukov, Xuming He, Limin Peng, editor(s)
2017, Book chapter, Handbook of Quantile Regression
No abstract available....
Potential paths for male-mediated gene flow to and from an isolated grizzly bear population
Christopher P. Peck, Frank T. van Manen, Cecily M. Costello, Mark A. Haroldson, Lisa Landenburger, Lori L. Roberts, Daniel D. Bjornlie, Richard D. Mace
2017, Ecosphere (8) 1-19
For several decades, grizzly bear populations in the Greater Yellowstone Ecosystem (GYE) and the Northern Continental Divide Ecosystem (NCDE) have increased in numbers and range extent. The GYE population remains isolated and although effective population size has increased since the early 1980s, genetic connectivity between these populations remains a long-term...
Statistical design and analysis for plant cover studies with multiple sources of observation errors
Wilson J. Wright, Kathryn M. Irvine, Jeffrey M . Warren, Jenny K. Barnett
2017, Methods in Ecology and Evolution (8) 1832-1841
Effective wildlife habitat management and conservation requires understanding the factors influencing distribution and abundance of plant species. Field studies, however, have documented observation errors in visually estimated plant cover including measurements which differ from the true value (measurement error) and not observing a species that is present within...
Projected warming portends seasonal shifts of stream temperatures in the Crown of the Continent Ecosystem, USA and Canada
Leslie A. Jones, Clint C. Muhlfeld, Lucy A. Marshall
2017, Climatic Change (144) 641-655
Climate warming is expected to increase stream temperatures in mountainous regions of western North America, yet the degree to which future climate change may influence seasonal patterns of stream temperature is uncertain. In this study, a spatially explicit statistical model framework was integrated with empirical stream temperature data (approximately four...
Assessing models of arsenic occurrence in drinking water from bedrock aquifers in New Hampshire
Caroline Andy, Maria Florencia Fahnestock, Melissa A. Lombard, Laura Hayes, Julie Bryce, Joseph D. Ayotte
2017, Journal of Contemporary Water Research and Education (160) 25-41
Three existing multivariate logistic regression models were assessed using new data to evaluate the capacity of the models to correctly predict the probability of groundwater arsenic concentrations exceeding the threshold values of 1, 5, and 10 micrograms per liter (µg/L) in New Hampshire, USA. A recently released testing dataset includes...
Applying citizen-science data and mark-recapture models to estimate numbers of migrant golden eagles in an important bird area in eastern North America
Andrew J. Dennhardt, Adam E. Duerr, David Brandes, Todd E. Katzner
2017, The Condor (119) 817-831
Estimates of population abundance are important to wildlife management and conservation. However, it can be difficult to characterize the numbers of broadly distributed, low-density, and elusive bird species. Although Golden Eagles (Aquila chrysaetos) are rare, difficult to detect, and broadly distributed, they are concentrated during their autumn migration at monitoring...
Fractional crystallization-induced variations in sulfides from the Noril’sk-Talnakh mining district (polar Siberia, Russia)
C.J. Duran, S-J. Barnes, P. Plese, M. Kudrna Prasek, Michael L. Zientek, P. Page
2017, Ore Geology Reviews (90) 326-351
The distribution of platinum-group elements (PGE) within zoned magmatic ore bodies has been extensively studied and appears to be controlled by the partitioning behavior of the PGE during fractional crystallization of magmatic sulfide liquids. However, other chalcophile elements, especially TABS (Te, As, Bi, Sb, and Sn) have been neglected despite...
Monitoring eradication of European mouflon sheep from the Kahuku Unit of Hawai‘i Volcanoes National Park
Seth Judge, Steven C. Hess, Jonathan K. Faford, Dexter Pacheco, Christina Leopold
2017, Pacific Science (71) 425-436
European mouflon (Ovis gmelini musimon), the world's smallest wild sheep, have proliferated and degraded fragile native ecosystems in the Hawaiian Islands through browsing, bark stripping, and trampling, including native forests within Hawai‘i Volcanoes National Park (HAVO). HAVO resource managers initiated ungulate control efforts in the 469 km2 Kahuku Unit after it...
Characterizing sources of uncertainty from global climate models and downscaling techniques
Adrienne Wootten, Adam Terando, Brian J. Reich, Ryan P. Boyles, Fred Semazzi
2017, Journal of Applied Meteorology and Climatology (56) 3245-3262
In recent years climate model experiments have been increasingly oriented towards providing information that can support local and regional adaptation to the expected impacts of anthropogenic climate change. This shift has magnified the importance of downscaling as a means to translate coarse-scale global climate model (GCM) output to a finer...
Simulation of daily streamflow for 12 river basins in western Iowa using the Precipitation-Runoff Modeling System
Daniel E. Christiansen, Adel E. Haj, John C. Risley
2017, Scientific Investigations Report 2017-5091
The U.S. Geological Survey, in cooperation with the Iowa Department of Natural Resources, constructed Precipitation-Runoff Modeling System models to estimate daily streamflow for 12 river basins in western Iowa that drain into the Missouri River. The Precipitation-Runoff Modeling System is a deterministic, distributed-parameter, physical-process-based modeling system developed to evaluate the...
Geologic map of the Dusar area, Herat Province, Afghanistan; Modified from the 1973 original map compilations of V.I. Tarasenko and others
2017, Open-File Report 2017-1126
The geologic maps and cross sections presented in this report are redrafted and modified versions of the Geologic map and map of useful minerals of the Dusar area (scale 1:50,000) and Geologic sketch map of the Dusar and Namak-sory ore occurrences (scale 1:10,000), located in the Herat Province, Afghanistan. The...
Some results from ModEM3DMT, the freely available OSU 3D MT inversion code
Gary D. Egbert, Naser Meqbel, Anna Kelbert
2017, Conference Paper
At the 3DEM-5 workshop in 2013, we presented a paper entitled "ModEM: developing 3D EM inversion for the masses", outlining our then recent development of a modular system for inversion of EM geophysical data, called ModEM. As promised in that presentation, we made a version of the code that is...
A coupled metabolic-hydraulic model and calibration scheme for estimating of whole-river metabolism during dynamic flow conditions
Robert A. Payn, Robert O Hall, Theodore A. Kennedy, Geoff C Poole, Lucy A. Marshall
2017, Limnology and Oceanography: Methods (15) 847-866
Conventional methods for estimating whole-stream metabolic rates from measured dissolved oxygen dynamics do not account for the variation in solute transport times created by dynamic flow conditions. Changes in flow at hourly time scales are common downstream of hydroelectric dams (i.e. hydropeaking), and hydrologic limitations of conventional metabolic models...
3D ground‐motion simulations of Mw 7 earthquakes on the Salt Lake City segment of the Wasatch fault zone: Variability of long‐period (T≥1 s) ground motions and sensitivity to kinematic rupture parameters
Morgan P. Moschetti, Stephen H. Hartzell, Leonardo Ramirez-Guzman, Arthur D. Frankel, Stephen J. Angster, William J. Stephenson
2017, Bulletin of the Seismological Society of America (107) 1704-1723
We examine the variability of long‐period (T≥1 s) earthquake ground motions from 3D simulations of Mw 7 earthquakes on the Salt Lake City segment of the Wasatch fault zone, Utah, from a set of 96 rupture models with varying slip distributions, rupture speeds, slip velocities, and hypocenter locations. Earthquake ruptures were prescribed on...
HERA: A dynamic web application for visualizing community exposure to flood hazards based on storm and sea level rise scenarios
Jeanne M. Jones, Kevin Henry, Nathan J. Wood, Peter Ng, Matthew Jamieson
2017, Computers & Geosciences (109) 124-133
The Hazard Exposure Reporting and Analytics (HERA) dynamic web application was created to provide a platform that makes research on community exposure to coastal-flooding hazards influenced by sea level rise accessible to planners, decision makers, and the public in a manner that is both easy to use and easily accessible....
Remote measurement of river discharge using thermal particle image velocimetry (PIV) and various sources of bathymetric information
Carl J. Legleiter, Paul J. Kinzel, Jonathan M. Nelson
2017, Journal of Hydrology (554) 490-506
Although river discharge is a fundamental hydrologic quantity, conventional methods of streamgaging are impractical, expensive, and potentially dangerous in remote locations. This study evaluated the potential for measuring discharge via various forms of remote sensing, primarily thermal imaging of flow velocities but also spectrally-based depth retrieval from passive optical image...
Riverine discharges to Chesapeake Bay: Analysis of long-term (1927–2014) records and implications for future flows in the Chesapeake Bay basin
Karen C. Rice, Douglas L. Moyer, Aaron L. Mills
2017, Journal of Environmental Management (204) 246-254
The Chesapeake Bay (CB) basin is under a total maximum daily load (TMDL) mandate to reduce nitrogen, phosphorus, and sediment loads to the bay. Identifying shifts in the hydro-climatic regime may help explain observed trends in water quality. To identify potential shifts, hydrologic data (1927–2014) for 27 watersheds in the...
Reconstructing the evolution of the submarine Monterey Canyon System from Os, Nd, and Pb isotopes in hydrogenetic Fe-Mn crusts
T.A. Conrad, S.G. Nielsen, Bernhard Peucker-Ehrenbrink, J. Blusztajn, D. Winslow, James R. Hein, A. Paytan
2017, Geochemistry, Geophysics, Geosystems (18) 3946-3963
The sources of terrestrial material delivered to the California margin over the past 7 Myr were assessed using 187Os/188Os, Nd, and Pb isotopes in hydrogenetic ferromanganese crusts from three seamounts along the central and southern California margin. From 6.8 to 4.5 (± 0.5) Ma, all three isotope systems show more radiogenic...
