Conference Papers
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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
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Columbia River Basin dreissenid mussel monitoring forum workshop Columbia River Basin dreissenid mussel monitoring forum workshop
To address actions identified in the Department of Interior’s “Safeguarding the West” strategy, the Pacific States Marine Fisheries Commission (PSMFC) and US Geological Survey (USGS) convened 43 invasive species coordinators and scientific experts June 5-6, 2018 in Portland, Oregon to assess the status of dreissenid monitoring efforts in the Columbia River Basin (CRB); identify key...
Authors
Lisa DeBruyckere, Timothy D. Counihan, Stephen Phillips
Generalizing linear stream features to preserve sinuosity for analysis and display: A pilot study in multi-scale data science Generalizing linear stream features to preserve sinuosity for analysis and display: A pilot study in multi-scale data science
Cartographic generalization can impact geometric properties of geospatial data and subsequent analyses. This study evaluates simplification methods with the goal of preserving geometric details, such as sinuosity. We evaluate two recently developed line simplification algorithms that introduce Steiner points: Raposo’s Spatial Means, and Kronenfeld’s new area-preserving segment collapse...
Authors
Larry V. Stanislawski, Barry J. Kronenfeld, Barbara P. Buttenfield, Tyler Brockmeyer
Ecological and management implications of climate change induced shifts in phenology of coastal fish and wildlife species in the Northeast CASC region Ecological and management implications of climate change induced shifts in phenology of coastal fish and wildlife species in the Northeast CASC region
Climate change is causing species to shift their phenology, or the timing of recurring life events such as migration and reproduction, in variable and complex ways. This can potentially result in mismatches or asynchronies in food and habitat resources that negatively impact individual fitness, population dynamics, and ecosystem function. Numerous studies have evaluated phenological...
Authors
Michelle D. Staudinger, Adrian Jordaan
Interaction between hydraulic fracture and a preexisting fracture under triaxial stress conditions Interaction between hydraulic fracture and a preexisting fracture under triaxial stress conditions
Enhanced reservoir connectivity generally requires maximizing the intersection between hydraulic fracture (HF) and preexisting underground natural fractures (NF), while having the hydraulic fracture cross the natural fractures (and not arrest). We have studied the interaction between a hydraulic fracture and a polished saw-cut fault. The experiments include a hydraulic fracture...
Authors
Saied Mighani, David A. Lockner, Brian D. Kilgore, Farrokh Sheibani, Brian Evans
Middle Pleistocene infill of Hinkley Valley by Mojave River sediment and associated lake sediment: Depositional architecture and deformation by strike-slip faults Middle Pleistocene infill of Hinkley Valley by Mojave River sediment and associated lake sediment: Depositional architecture and deformation by strike-slip faults
Hinkley Valley in the Mojave Desert, near Barstow about 140 km northeast of Los Angeles and midway between Victorville Valley and the Lake Manix basin, contains a thick sedimentary sequence delivered by the Mojave River. Our study of sediment cores drilled in the valley indicates that Hinkley Valley was probably a closed playa basin with stream inflow from four directions prior to Mojave...
Authors
David M. Miller, Elizabeth Haddon, Victoria E. Langenheim, Andrew J. Cyr, Elmira Wan, Laura Walkup, Scott W. Starratt
Development of Raman spectroscopy as a thermal maturity proxy in unconventional resource assessment Development of Raman spectroscopy as a thermal maturity proxy in unconventional resource assessment
The objective of this study was to correlate shale hydrous pyrolysis with thermal maturity measurements based on solid bitumen reflectance (BRo) at the U.S. Geological Survey (USGS) and Raman microscopy (RM) at WellDog. In semi-blind Phase I, BRo values of the initial set of 8 samples were withheld prior to RM analysis. As reported previously, a strong correlation was observed between...
Authors
Grant A. Myers, Kelsey Kehoe, Paul C. Hackley
International Limnogeology Congress (ILIC6), Reno USA, special issue on new limnogeological research focused on Holocene lake systems International Limnogeology Congress (ILIC6), Reno USA, special issue on new limnogeological research focused on Holocene lake systems
The 6th International Limnogeology Congress (ILIC6) of the International Association of Limnogeology (IAL) was held in Reno, Nevada, USA 15–19 June, 2015. The successful congress brought together a wide variety of academic, government, and industry participants from 20 countries and six continents. The highpoint of the four-day meeting were eight keynote addresses highlighting cutting...
Authors
Scott W. Starratt, Michael R. Rosen
Hydrogeophysics at societally relevant scales: Airborne electromagnetic applications and model structural uncertainty quantification Hydrogeophysics at societally relevant scales: Airborne electromagnetic applications and model structural uncertainty quantification
There is a critical and growing need for information about subsurface geological properties and processes over sufficiently large areas that can inform key scientific and societal studies. Airborne geophysical methods fill a unique role in Earth observation because of their ability to detect deep subsurface properties at regional scales and with high spatial resolution that cannot be...
Authors
Burke J. Minsley, Nathan Leon Foks, Wade H. Kress, James R. Rigby
Geomorphic identification of physical habitat features in a large, altered river system Geomorphic identification of physical habitat features in a large, altered river system
Altered flow regimes in streams can significantly affect ecosystems and disturb ecological processes, leading to species loss and extinction. Many river management projects use stream classification and habitat assessment approaches to design practical solutions to reverse or mitigate adverse effects of flow regime alteration on stream systems. The objective of this study was to develop...
Authors
L. Guertault, G. Fox, Shannon K. Brewer
Irregular focal mechanisms observed at Salton Sea Geothermal Field: Possible influences of anthropogenic stress perturbations Irregular focal mechanisms observed at Salton Sea Geothermal Field: Possible influences of anthropogenic stress perturbations
At the Salton Sea Geothermal Field (SSGF), strain accumulation is released through seismic slip and aseismic deformation. Earthquake activity at the SSGF often occurs in swarm-like clusters, some with clear migration patterns. We have identified an earthquake sequence composed entirely of focal mechanisms representing an ambiguous style of faulting, where strikes are similar but...
Authors
Aren Crandall-Bear, Andrew J. Barbour, Martin Schoenball
Use of real-time dust monitoring and surface condition to evaluate success of unpaved road treatments Use of real-time dust monitoring and surface condition to evaluate success of unpaved road treatments
No abstract available.
Authors
Bethany K. Kunz, Nicholas S. Green, Janice L. Albers, Mark L. Wildhaber, Edward E. Little
Is sensitivity to anticoagulant rodenticides affected by repeated exposure in hawks? Is sensitivity to anticoagulant rodenticides affected by repeated exposure in hawks?
A seminal question in wildlife toxicology is whether exposure to an environmental contaminant, in particular a second-generation anticoagulant rodenticide, can evoke subtle long lasting effects on body condition, physiological function and survival. Many reports indicate that non-target predators often carry residues of several rodenticides, which is indicative of multiple exposures. An...
Authors
Barnett Rattner