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Browse more than 65,000 articles authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.
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Oxygen isotopes of land snail shells in high latitude regions Oxygen isotopes of land snail shells in high latitude regions
The present study investigates the environmental significance of the oxygen isotopic composition of several modern land snail species collected along two north-to-south transects in Alaska and Scandinavia at latitudes between 60 and 70 °N. We tested the hypothesis that land snail shell δ18O values primarily track precipitation δ18O. The results show that shell δ18O values from...
Authors
Catherine Nield, Yurena Yanes, Jeffrey S. Pigati, Jason A. Rech, Ted von Proschwitz, Jeffrey C. Nekola
Earthquake early warning for estimating floor shaking levels of tall buildings Earthquake early warning for estimating floor shaking levels of tall buildings
This article investigates methods to improve earthquake early warning (EEW) predictions of shaking levels for residents of tall buildings. In the current U.S. Geological Survey ShakeAlert EEW system, regions far from an epicenter will not receive alerts due to low predicted ground‐shaking intensities. However, residents of tall buildings in those areas may still experience significant...
Authors
S. Farid Ghahari, Annemarie S. Baltay Sundstrom, Mehmet Celebi, Grace Alexandra Parker, Jeffrey J. McGuire, Ertugrul Taciroglu
Age-specific survival rates, causes of death, and allowable take of golden eagles in the western United States Age-specific survival rates, causes of death, and allowable take of golden eagles in the western United States
In the United States, the Bald and Golden Eagle Protection Act prohibits take of golden eagles (Aquila chrysaetos) unless authorized by permit, and stipulates that all permitted take must be sustainable. Golden eagles are unintentionally killed in conjunction with many lawful activities (e.g., electrocution on power poles, collision with wind turbines). Managers who issue permits for...
Authors
Brian Milsap, Guthrie S. Zimmerman, William L. Kendall, Joseph G. Barnes, Melissa A. Braham, Bryan E Bedrosian, Douglas A. Bell, Peter H. Bloom, Ross H. Crandall, Robert Domenech, Daniel Driscoll, Adam E. Duerr, Rick Gerhardt, Samantha E.J. Gibbs, Alan R. Harmata, Kenneth Jacobson, Todd E. Katzner, Robert N. Knight, J. Michael Lockhart, Carol McIntyre, Robert K. Murphy, Steven J. Slater, Brian W. Smith, Jeff P. Smith, Dale W. Stahlecker, James W. Watson
Enhanced bioremediation of RDX and co-contaminants perchlorate and nitrate using an anaerobic dehalogenating consortium in a fractured rock aquifer Enhanced bioremediation of RDX and co-contaminants perchlorate and nitrate using an anaerobic dehalogenating consortium in a fractured rock aquifer
The potential neurotoxic and carcinogenic effects of the explosives compound RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine) on human health requires groundwater remediation strategies to meet low cleanup goals. Bioremediation of RDX is feasible through biostimulation of native microbes with an organic carbon donor but may be less efficient, or not occur at all, in the presence of the...
Authors
Michelle M. Lorah, Eric Vogler, Fredrick E. Gebhardt, Duane Graves, Jennifer Grabowski
A landscape approach for identifying potential reestablishment sites for extirpated stream fishes: an example with Arctic grayling (Thymallus arcticus) in Michigan A landscape approach for identifying potential reestablishment sites for extirpated stream fishes: an example with Arctic grayling (Thymallus arcticus) in Michigan
Habitat degradation combined with climate change increases the threat of extinction for stream fishes. In response to these threats, efforts to reestablish species within formerly occupied streams or translocation to suitable areas may be effective conservation strategies. In the absence of historic species presence data, identifying locations where suitable habitat exists across many...
Authors
Ralph William Tingley, Dana M. Infante, Emily M. Dean, Douglas W. Schemske, Arthur R. Cooper, Jared Ross, Wesley M. Daniel
Ready for real time: Performance of Global Navigation Satellite System in 2019 Mw 7.1 Ridgecrest, California, rapid response products Ready for real time: Performance of Global Navigation Satellite System in 2019 Mw 7.1 Ridgecrest, California, rapid response products
Global Navigation Satellite Systems (GNSSs) have undergone notable advancement in the last few decades, leading to the availability of a dataset with capabilities well beyond its original intended purpose. The proliferation of high‐rate (1 Hz or greater) GNSS receivers in areas of seismological interest now allows for routine consideration of dynamic earthquake ground motions, with...
Authors
Dara Elyse Goldberg, Kirstie Lafon Haynie
Kinematic slip model of the July 8, 2021 M6.0 Antelope Valley, California, earthquake Kinematic slip model of the July 8, 2021 M6.0 Antelope Valley, California, earthquake
We present a kinematic slip model of the July 8, 2021 Antelope Valley earthquake from a finite-source inversion based on regional seismic waveforms and static offsets from GPS and InSAR. Seismic waveforms are employed at 6s dominant period out to 100 km from the epicenter, and the combined GPS and InSAR datasets cover the near field and far field out to ∼ 100 km and constrain the overall...
Authors
Frederick Pollitz, Charles Wicks, William M Hammond
Redundancy analysis reveals complex den use patterns by eastern spotted skunks, a conditional specialist Redundancy analysis reveals complex den use patterns by eastern spotted skunks, a conditional specialist
Wildlife managers tasked with understanding habitat and resource selection at the population level attempt to characterize patterns in nature that aid and inform conservation. Resource selection functions (RSFs), such as discrete choice analyses, are the standard convention to characterize the effects of habitat attributes on resource selection patterns. These tools are invaluable for...
Authors
Emily D. Thorne, W. Mark Ford
Geomorphic responses of fluvial systems to climate change: A habitat perspective Geomorphic responses of fluvial systems to climate change: A habitat perspective
Fluvial systems provide a variety of habitats that support thousands of species including many that are threatened or endangered. Moreover, these habitats, which range from aquatic and riparian to floodplain, are important for the variety of ecosystem services they provide. In addition to water temperature and streamflow change, geomorphic change is important and warrants consideration...
Authors
Kyle E. Juracek, Faith A. Fitzpatrick
Terrestrial ecosystem modeling with IBIS: Progress and future vision Terrestrial ecosystem modeling with IBIS: Progress and future vision
Dynamic Global Vegetation Models (DGVM) are powerful tools for studying complicated ecosystem processes and global changes. This review article synthesizes the developments and applications of the Integrated Biosphere Simulator (IBIS), a DGVM, over the past two decades. IBIS has been used to evaluate carbon, nitrogen, and water cycling in terrestrial ecosystems, vegetation changes, land...
Authors
Jinxun Liu, Xuehe Lu, Qiuan Zhu, Wenping Yuan, Quanzhi Yuan, Zhen Zhang, Qingxi Guo, Carol Deering
Winter habitat selection and efficacy of telemetry to aid Grass Carp removal efforts in a large reservoir Winter habitat selection and efficacy of telemetry to aid Grass Carp removal efforts in a large reservoir
Grass Carp Ctenopharyngodon idella were introduced in North America to control aquatic vegetation in small, closed systems. However, when they escape into larger systems in which they can reproduce, they have the potential to cause significant declines and alterations in aquatic vegetation communities. These alterations can in turn affect native species that are dependent on aquatic...
Authors
Tyler Michael Hessler, Duane Chapman, Craig P. Paukert, Jeff C. Jolley, Michael E. Byrne
A novel regression method for harmonic analysis of time series A novel regression method for harmonic analysis of time series
Harmonic analysis of time series is an important technique in remote sensing to reveal seasonal land surface dynamics. However, frequency selection in the harmonic analysis is often difficult because high-frequency components are useful for delineating seasonal dynamics but sensitive to noise and gaps in time series. On the other hand, it is challenging to obtain temporally continuous...
Authors
Qiang Zhou, Zhe Zhu, George Z. Xian, Congcong Li