Quaternary displacement rates on the Meeman‐Shelby fault and Joiner ridge horst, eastern Arkansas: Results from coring Mississippi River alluvium
Alex Ward, Ronald C. Counts, Roy Van Arsdale, Daniel Larsen, Shannon A. Mahan
2017, Seismological Research Letters (88) 442-455
This research used coring and optically stimulated luminescence (OSL) dating of displaced, deeply buried Quaternary alluvium to determine vertical displacement rates for the Meeman‐Shelby fault and the Joiner ridge horst, two structures in northeastern Arkansas that have no modern seismicity associated with them. We drilled continuous cores of the entire...
The role of initial coherence and path materials in the dynamics of three rock avalanche case histories
Jordan Aaron, Scott McDougall, Jeffrey R. Moore, Jeffrey A. Coe, Oldrich Hungr
2017, Geoenvironmental Disasters (4)
BackgroundRock avalanches are flow-like landslides that can travel at extremely rapid velocities and impact surprisingly large areas. The mechanisms that lead to the unexpected mobility of these flows are unknown and debated. Mechanisms proposed in the literature can be broadly classified into those that rely...
Compartmentalization of the Coso East Flank geothermal field imaged by 3-D full-tensor MT inversion
Nathaniel J. Lindsey, J. Ole Kaven, Nicholas C. Davatzes, Gregory A. Newman
2017, Geophysical Journal International (208) 652-662
Previous magnetotelluric (MT) studies of the high-temperature Coso geothermal system in California identified a subvertical feature of low resistivity (2–5 Ohm m) and appreciable lateral extent (>1 km) in the producing zone of the East Flank field. However, these models could not reproduce gross 3-D effects in the recorded data. We perform...
Terrestrial ecosystem model performance in simulating productivity and its vulnerability to climate change in the northern permafrost region
Jianyang Xia, A. David McGuire, David Lawrence, Eleanor J. Burke, Guangsheng Chen, Xiaodong Chen, Christine Delire, Charles Koven, Andrew MacDougall, Shushi Peng, Annette Rinke, Kazuyuki Saito, Wenxin Zhang, Ramdane Alkama, Theodore J. Bohn, Philippe Ciais, Bertrand Decharme, Isabelle Gouttevin, Tomohiro Hajima, Daniel J. Hayes, Kun Huang, Duoying Ji, Gerhard Krinner, Dennis P. Lettenmaier, Paul A. Miller, John C. Moore, Benjamin Smith, Tetsuo Sueyoshi, Zheng Shi, Liming Yan, Junyi Liang, Lifen Jiang, Qian Zhang, Yiqi Luo
2017, Journal of Geophysical Research: Biogeosciences (122) 430-446
Realistic projection of future climate-carbon (C) cycle feedbacks requires better understanding and an improved representation of the C cycle in permafrost regions in the current generation of Earth system models. Here we evaluated 10 terrestrial ecosystem models for their estimates of net primary productivity (NPP) and responses to historical climate...
Is “morphodynamic equilibrium” an oxymoron?
Zeng Zhou, Giovanni Coco, Ian Townend, Maitane Olabarrieta, Mick van der Wegen, Zheng Gong, Andrea D’Alpaos, Shu Gao, Bruce E. Jaffe, Guy R. Gelfenbaum, Qing He, Yaping Wang, Stefano Lanzoni, Zhengbing Wang, Han Winterwerp, Changkuan Zhang
2017, Earth-Science Reviews (165) 257-267
Morphodynamic equilibrium is a widely adopted yet elusive concept in the field of geomorphology of coasts, rivers and estuaries. Based on the Exner equation, an expression of mass conservation of sediment, we distinguish three types of equilibrium defined as static and dynamic, of which two different types exist. Other expressions...
The invasive ant, Solenopsis invicta, reduces herpetofauna richness and abundance
Craig R. Allen, Hannah E. Birge, J. Slater, E. Wiggers
2017, Biological Invasions (19) 713-722
Amphibians and reptiles are declining globally. One potential cause of this decline includes impacts resulting from co-occurrence with non-native red imported fire ant, Solenopsis invicta. Although a growing body of anecdotal and observational evidence from laboratory experiments supports this hypothesis, there remains a lack of field scale manipulations testing...
Expanding the role of reactive transport models in critical zone processes
Li Li, Kate Maher, Alexis Navarre-Sitchler, Jennifer Druhan, Christof Meile, Corey Lawrence, Joel Moore, Julia Perdrial, Pamela Sullivan, Aaron Thompson, Lixin Jin, Edward W. Bolton, Susan L. Brantley, William E. Dietrich, K. Ulrich Mayer, Carl Steefel, Albert J. Valocchi, John M. Zachara, Benjamin D. Kocar, Jennifer McIntosh, Benjamin M. Tutolo, Mukesh Kumar, Eric Sonnenthal, Chen Bao, Joe Beisman
2017, Earth-Science Reviews (165) 280-301
Models test our understanding of processes and can reach beyond the spatial and temporal scales of measurements. Multi-component Reactive Transport Models (RTMs), initially developed more than three decades ago, have been used extensively to explore the interactions of geothermal, hydrologic, geochemical, and geobiological processes in subsurface systems. Driven by extensive...
Predicting animal home-range structure and transitions using a multistate Ornstein-Uhlenbeck biased random walk
Greg A. Breed, Emily A. Golson, M. Tim Tinker
2017, Ecology (98) 32-47
The home‐range concept is central in animal ecology and behavior, and numerous mechanistic models have been developed to understand home range formation and maintenance. These mechanistic models usually assume a single, contiguous home range. Here we describe and implement a simple home‐range model that can accommodate multiple...
Tidal triggering of earthquakes suggests poroelastic behavior on the San Andreas Fault
Andrew Delorey, Nicholas van der Elst, Paul Johnson
2017, Earth and Planetary Science Letters (460) 164-170
Tidal triggering of earthquakes is hypothesized to provide quantitative information regarding the fault's stress state, poroelastic properties, and may be significant for our understanding of seismic hazard. To date, studies of regional or global earthquake catalogs have had only modest successes in identifying tidal triggering. We posit that the smallest...
Oxygen isotope geochemistry of mafic phenocrysts in primitive mafic lavas from the southernmost Cascade Range, California
Sandra J. Underwood, Michael A. Clynne
2017, American Mineralogist (102) 251-261
Previously reported whole-rock δ18O values (5.6–7.8‰) for primitive quaternary mafic lavas from the southernmost Cascades (SMC) are often elevated (up to 1‰) relative to δ18O values expected for mafic magmas in equilibrium with mantle peridotite. Olivine, clinopyroxene, and plagioclase crystals were separated from 29 geochemically well-characterized mafic lavas for δ18O...
Ground motion in the presence of complex Topography II: Earthquake sources and 3D simulations
Stephen H. Hartzell, Leonardo Ramirez-Guzman, Mark Meremonte, Alena L. Leeds
2017, Bulletin of the Seismological Society of America (107) 344-358
Eight seismic stations were placed in a linear array with a topographic relief of 222 m over Mission Peak in the east San Francisco Bay region for a period of one year to study topographic effects. Seventy‐two well‐recorded local earthquakes are used to calculate spectral amplitude ratios relative to a reference...
An integrated data model to estimate spatiotemporal occupancy, abundance, and colonization dynamics
Perry J. Williams, Mevin Hooten, Jamie N. Womble, George G. Esslinger, Michael R. Bower, Trevor J. Hefley
2017, Ecology (98) 328-336
Ecological invasions and colonizations occur dynamically through space and time. Estimating the distribution and abundance of colonizing species is critical for efficient management or conservation. We describe a statistical framework for simultaneously estimating spatiotemporal occupancy and abundance dynamics of a colonizing species. Our method accounts for several issues that are...
A land data assimilation system for sub-Saharan Africa food and water security applications
Amy McNally, Kristi Arsenault, Sujay Kumar, Shraddhanand Shukla, Pete Peterson, Shugong Wang, Chris Funk, Christa Peters-Lidard, James Verdin
2017, Scientific Data (4) 1-19
Seasonal agricultural drought monitoring systems, which rely on satellite remote sensing and land surface models (LSMs), are important for disaster risk reduction and famine early warning. These systems require the best available weather inputs, as well as a long-term historical record to contextualize current observations. This article introduces the Famine...
Hard choices in assessing survival past dams — a comparison of single- and paired-release strategies
Joseph D. Zydlewski, Daniel S. Stich, Douglas B. Sigourney
2017, Canadian Journal of Fisheries and Aquatic Sciences (74) 178-190
Mark–recapture models are widely used to estimate survival of salmon smolts migrating past dams. Paired releases have been used to improve estimate accuracy by removing components of mortality not attributable to the dam. This method is accompanied by reduced precision because (i) sample size is reduced relative to a single,...
Evaluating simplistic methods to understand current distributions and forecast distribution changes under climate change scenarios: An example with coypu (Myocastor coypus)
Catherine S. Jarnevich, Nicholas E. Young, Trevor R. Sheffels, Jacoby Carter, Mark D. Systma, Colin Talbert
2017, NeoBiota (32) 107-125
Invasive species provide a unique opportunity to evaluate factors controlling biogeographic distributions; we can consider introduction success as an experiment testing suitability of environmental conditions. Predicting potential distributions of spreading species is not easy, and forecasting potential distributions with changing climate is even more difficult. Using the globally invasive coypu...
Development and utilization of USGS ShakeCast for rapid post-earthquake assessment of critical facilities and infrastructure
David J. Wald, Kuo-wan Lin, C. A. Kircher, Kishor S. Jaiswal, Nico Luco, L. Turner, Daniel Slosky
2017, Conference Paper, Proceedings of the 16th World Conference on Earthquake Engineering
The ShakeCast system is an openly available, near real-time post-earthquake information management system. ShakeCast is widely used by public and private emergency planners and responders, lifeline utility operators and transportation engineers to automatically receive and process ShakeMap products for situational awareness, inspection priority, or damage assessment of their own infrastructure...
A discrete stage-structured model of California newt population dynamics during a period of drought
Marjorie T. Jones, William R. Milligan, Lee B. Kats, Thomas L. Vandergon, Rodney L. Honeycutt, Robert N. Fisher, Courtney L. Davis, Timothy A. Lucas
2017, Journal of Theoretical Biology (414) 245-253
We introduce a mathematical model for studying the population dynamics under drought of the California newt (Taricha torosa), a species of special concern in the state of California. Since 2012, California has experienced a record-setting drought, and multiple studies predict drought conditions currently underway will persist and even increase in...
Variability of runoff-based drought conditions in the conterminous United States
Gregory J. McCabe, David M. Wolock, Samuel H. Austin
2017, International Journal of Climatology (37) 1014-1021
In this study, a monthly water-balance model is used to simulate monthly runoff for 2109 hydrologic units (HUs) in the conterminous United States (CONUS) for water-years 1901 through 2014. The monthly runoff time series for each HU were smoothed with a 3-month moving average, and then the 3-month moving-average runoff...
Dynamic strains for earthquake source characterization
Andrew J. Barbour, Brendan W. Crowell
2017, Seismological Research Letters (88) 354-370
Strainmeters measure elastodynamic deformation associated with earthquakes over a broad frequency band, with detection characteristics that complement traditional instrumentation, but they are commonly used to study slow transient deformation along active faults and at subduction zones, for example. Here, we analyze dynamic strains at Plate Boundary Observatory (PBO) borehole strainmeters...
Using silver and bighead carp cell lines for the identification of a unique metabolite fingerprint from thiram-specific chemical exposure
Joel G. Putnam, Justine Nelson, Eric M. Leis, Richard A. Erickson, Terrance D. Hubert, Jon J. Amberg
2017, Chemosphere (168) 1477-1485
Conservation biology often requires the control of invasive species. One method is the development and use of biocides. Identifying new chemicals as part of the biocide registration approval process can require screening millions of compounds. Traditionally, screening new chemicals has been done in vivo using test organisms. Using in vitro (e.g.,...
Inhibition of an aquatic rhabdovirus demonstrates promise of a broad-spectrum antiviral for use in aquaculture
Bethany F. Balmer, Rachel L. Powers, Ting-Hu Zhang, Jihye Lee, Frederic Vigant, Benhur Lee, Michael E. Jung, Maureen K. Purcell, Kevin Snekvik, Hector C. Aguilar
2017, Journal of Virology (91)
Many enveloped viruses cause devastating disease in aquaculture, resulting in significant economic impact. LJ001 is a broad-spectrum antiviral compound that inhibits enveloped virus infections by specifically targeting phospholipids in the lipid bilayer via the production of singlet oxygen (1O2). This stabilizes positive curvature and decreases membrane fluidity, which inhibits virus-cell...
Managing American Oystercatcher (Haematopus palliatus) population qrowth by targeting nesting season vital rates
Shilo K. Felton, Nathan J. Hostetter, Kenneth H. Pollock, Theodore R. Simons
2017, Waterbirds (40) 44-54
In populations of long-lived species, adult survival typically has a relatively high influence on population growth. From a management perspective, however, adult survival can be difficult to increase in some instances, so other component rates must be considered to reverse population declines. In North Carolina, USA, management to conserve the...
Modeling strong‐motion recordings of the 2010 Mw 8.8 Maule, Chile, earthquake with high stress‐drop subevents and background slip
Arthur D. Frankel
2017, Bulletin of the Seismological Society of America (107) 372-386
Strong‐motion recordings of the Mw 8.8 Maule earthquake were modeled using a compound rupture model consisting of (1) a background slip distribution with large correlation lengths, relatively low slip velocity, and long peak rise time of slip of about 10 s and (2) high stress‐drop subevents (asperities) on the deeper portion of the rupture...
Assessing conditions influencing the longitudinal distribution of exotic brown trout (Salmo trutta) in a mountain stream: a spatially-explicit modeling approach
Christy S. Meredith, Phaedra E. Budy, Mevin Hooten, Marcos Oliveira Prates
2017, Biological Invasions (19) 503-519
Trout species often segregate along elevational gradients, yet the mechanisms driving this pattern are not fully understood. On the Logan River, Utah, USA, exotic brown trout (Salmo trutta) dominate at low elevations but are near-absent from high elevations with native Bonneville cutthroat trout (Onchorhynchus clarkii utah)....
Simulation of earthquake ground motions in the eastern United States using deterministic physics‐based and site‐based stochastic approaches
Sanaz Rezaeian, Stephen H. Hartzell, Xiaodan Sun, Carlos Mendoza
2017, Bulletin of the Seismological Society of America (107) 149-168
Earthquake ground‐motion recordings are scarce in the central and eastern United States (CEUS) for large‐magnitude events and at close distances. We use two different simulation approaches, a deterministic physics‐based method and a site‐based stochastic method, to simulate ground motions over a wide range of magnitudes. Drawing...
