Continuity of the West Napa–Franklin fault zone inferred from guided waves generated by earthquakes following the 24 August 2014 Mw 6.0 South Napa Earthquake
Rufus D. Catchings, Mark R. Goldman, Y.-G. Li, Joanne H. Chan
2016, Bulletin of the Seismological Society of America (106) 2721-2746
We measure peak ground velocities from fault‐zone guided waves (FZGWs), generated by on‐fault earthquakes associated with the 24 August 2014 Mw 6.0 South Napa earthquake. The data were recorded on three arrays deployed across north and south of the 2014 surface rupture. The observed FZGWs indicate that the West Napa fault zone...
A cellular automata downscaling based 1 km global land use datasets (2010–2100)
Xuecao Li, Le Yu, Terry L. Sohl, Nicholas Clinton, Wenyu Li, Zhiliang Zhu, Xiaoping Liu, Peng Gong
2016, Science Bulletin (61) 1651-1661
Global climate and environmental change studies require detailed land-use and land-cover(LULC) information about the past, present, and future. In this paper, we discuss a methodology for downscaling coarse-resolution (i.e., half-degree) future land use scenarios to finer (i.e., 1 km) resolutions at the global scale using a grid-based spatially explicit cellular automata (CA)...
Linking silicate weathering to riverine geochemistry—A case study from a mountainous tropical setting in west-central Panama
Russell S. Harmon, Gerhard Wörner, Steven T. Goldsmith, Brendan A. Harmon, Christopher B. Gardner, W. Berry Lyons, Fred L. Ogden, Michael J. Pribil, David T. Long, Zoltán Kern, István Fórizs
2016, GSA Bulletin (128) 1780-1812
Chemical analyses from 71 watersheds across an ∼450 km transect in west-central Panama provide insight into controls on weathering and rates of chemical denudation and CO2 consumption across an igneous arc terrain in the tropics. Stream and river compositions across this region of Panama are generally dilute, having a total dissolved...
Multiple browsers structure tree recruitment in logged temperate forests
Edward K. Faison, Stephen DeStefano, David R. Foster, Joshua M. Rapp, Justin A. Compton
2016, PLoS ONE (11) 1-14
Historical extirpations have resulted in depauperate large herbivore assemblages in many northern forests. In eastern North America, most forests are inhabited by a single wild ungulate species, white-tailed deer (Odocoileus virginianus), and relationships between deer densities and impacts on forest regeneration are correspondingly well documented. Recent recolonizations by moose (Alces...
Holocene volcanism of the upper McKenzie River catchment, central Oregon Cascades, USA
Natalia I. Deligne, Richard M. Conrey, Katharine V. Cashman, Duane E. Champion, William H. Amidon
2016, Geological Society of America Bulletin (128) 1618-1635
To assess the complexity of eruptive activity within mafic volcanic fields, we present a detailed geologic investigation of Holocene volcanism in the upper McKenzie River catchment in the central Oregon Cascades, United States. We focus on the Sand Mountain volcanic field, which covers 76 km2 and consists of 23 vents,...
Review of footnotes and annotations to the 1949–2013 tables of standard atomic weights and tables of isotopic compositions of the elements (IUPAC Technical Report)
Tyler B. Coplen, Norman E. Holden
2016, Pure and Applied Chemistry (88) 689-699
The Commission on Isotopic Abundances and Atomic Weights uses annotations given in footnotes that are an integral part of the Tables of Standard Atomic Weights to alert users to the possibilities of quite extraordinary occurrences, as well as sources with abnormal atomic-weight values outside an otherwise acceptable range. The basic...
Seismic imaging of the metamorphism of young sediment into new crystalline crust in the actively rifting Imperial Valley, California
Liang Han, John Hole, Joann Stock, Gary S. Fuis, Colin F. Williams, Jonathan Delph, Kathy Davenport, Amanda Livers
2016, Geochemistry, Geophysics, Geosystems (17) 4566-4584
Plate-boundary rifting between transform faults is opening the Imperial Valley of southern California and the rift is rapidly filling with sediment from the Colorado River. Three 65–90 km long seismic refraction profiles across and along the valley, acquired as part of the 2011 Salton Seismic Imaging Project, were analyzed to...
Three whole-wood isotopic reference materials, USGS54, USGS55, and USGS56, for δ2H, δ13C, δ15N, and δ18O measurements
Haiping Qi, Tyler B. Coplen, James A. Jordan
2016, Chemical Geology (442) 47-53
Comparative measurements of stable hydrogen and oxygen isotopes in wood are hampered by the lack of proper reference materials (RMs). The U.S. Geological Survey (USGS) has prepared three powdered, whole-wood RMs, USGS54 (Pinus contorta, Canadian lodgepole pine), USGS55 (Cordia cf. dodecandra, Mexican ziricote), and USGS56 (Berchemia cf. zeyheri, South...
Volcano dome dynamics at Mount St. Helens: Deformation and intermittent subsidence monitored by seismicity and camera imagery pixel offsets
Jacqueline T. Salzer, Weston A. Thelen, Mike R. James, Thomas R. Walter, Seth C. Moran, Roger P. Denlinger
2016, Journal of Geophysical Research B: Solid Earth (121) 7882-7902
The surface deformation field measured at volcanic domes provides insights into the effects of magmatic processes, gravity- and gas-driven processes, and the development and distribution of internal dome structures. Here we study short-term dome deformation associated with earthquakes at Mount St. Helens, recorded by a permanent optical camera and seismic...
Climate-change signals in national atmospheric deposition program precipitation data
Gregory A. Wetherbee, M. Alisa Mast
2016, Climate Dynamics (47) 3141-3155
National Atmospheric Deposition Program (NADP)/National Trends Network precipitation type, snow-season duration, and annual timing of selected chemical wet-deposition maxima vary with latitude and longitude within a 35-year (1979–2013) data record for the contiguous United States and Alaska. From the NADP data collected within the region bounded by 35.6645°–48.782° north latitude...
Effects of consumption-oriented versus trophy-oriented fisheries on Muskellunge population size structure in northern Wisconsin
Matthew D. Faust, Michael J. Hansen
2016, North American Journal of Fisheries Management (36) 1336-1346
To determine whether a consumption-oriented fishery was compatible with a trophy-oriented fishery for Muskellunge Esox masquinongy, we modeled effects of a spearing fishery and recreational angling fishery on population size structure (i.e., numbers of fish ≥ 102, 114, and 127 cm) in northern Wisconsin. An individual-based simulation model was used...
Analyses of infrequent (quasi-decadal) large groundwater recharge events in the northern Great Basin: Their importance for groundwater availability, use, and management
Melissa D. Masbruch, Christine Rumsey, Subhrendu Gangopadhyay, David D. Susong, Tom Pruitt
2016, Water Resources Research (52) 7819-7836
There has been a considerable amount of research linking climatic variability to hydrologic responses in the western United States. Although much effort has been spent to assess and predict changes in surface water resources, little has been done to understand how climatic events and changes affect groundwater resources. This study...
Environmental drivers of differences in microbial community structure in crude oil reservoirs across a methanogenic gradient
Jenna L. Shelton, Denise M. Akob, Jennifer C. McIntosh, Noah Fierer, John R. Spear, Peter D. Warwick, John E. McCray
2016, Frontiers in Microbiology (7)
Stimulating in situ microbial communities in oil reservoirs to produce natural gas is a potentially viable strategy for recovering additional fossil fuel resources following traditional recovery operations. Little is known about what geochemical parameters drive microbial population dynamics in biodegraded, methanogenic oil reservoirs. We investigated if microbial community structure was...
King Rail (Rallus elegans) Nesting and Brood Rearing Ecology at Red Slough WMA, SE Oklahoma
David G. Krementz, Karen L. Willard, M. Carroll, Katie M. Dugger
2016, Waterbirds (39) 241-249
Organizing environmental flow frameworks to meet hydropower mitigation needs
Ryan A. McManamay, Shannon K. Brewer, Henriette Jager, Matthew J. Troia
2016, Environmental Management (58) 365-385
The global recognition of the importance of natural flow regimes to sustain the ecological integrity of river systems has led to increased societal pressure on the hydropower industry to change plant operations to improve downstream aquatic ecosystems. However, a complete reinstatement of natural flow regimes is often unrealistic when balancing...
Migratory bird habitat in relation to tile drainage and poorly drained hydrologic soil groups
Brandi Kastner, Victoria G. Christensen, Tanja N. Williamson, Christopher A. Sanocki
2016, Conference Paper, 10th International Drainage Symposium Conference
The Prairie Pothole Region (PPR) is home to more than 50% of the migratory waterfowl in North America. Although the PPR provides an abundance of temporary and permanent wetlands for nesting and feeding, increases in commodity prices and agricultural drainage practices have led to a trend of wetland drainage. The...
The Grand Ethiopian Renaissance Dam: Source of cooperation or contention?
Meron Teferi Taye, Tsegaye Tadesse, Gabriel B. Senay, Paul Block
2016, Journal of Water Resources Planning and Management (142) 1-5
This paper discusses the challenges and benefits of the Grand Ethiopian Renaissance Dam (GERD), which is under construction and expected to be operational on the Blue Nile River in Ethiopia in a few years. Like many large-scale projects on transboundary rivers, the GERD has been criticized for potentially jeopardizing downstream...
Influence of anglers' specializations on catch, harvest, and bycatch of targeted taxa
Kevin L. Pope, Christopher J. Chizinski, Christopher L. Wiley, Dustin R. Martin
2016, Fisheries Research (183) 128-137
Fishery managers often use catch per unit effort (CPUE) of a given taxon derived from a group of anglers, those that sought said taxon, to evaluate fishery objectives because managers assume CPUE for this group of anglers is most sensitive to changes in fish taxon density. Further, likelihood of harvest...
Direct photolysis rates and transformation pathways of the lampricides TFM and niclosamide in simulated sunlight
Megan B. McConville, Terrance D. Hubert, Christina K. Remucal
2016, Environmental Science & Technology (50) 9998-10006
The lampricides 3-trifluoromethyl-4-nitrophenol (TFM) and 2′,5-dichloro-4′-nitrosalicylanilide (niclosamide) are directly added to many tributaries of the Great Lakes that harbor the invasive parasitic sea lamprey. Despite their long history of use, the fate of lampricides is not well understood. This study evaluates the rate and pathway of direct photodegradation of both...
Long-term continuous acoustical suspended-sediment measurements in rivers – Theory, evaluation, and results from 14 stations on five rivers
David J. Topping, Scott Wright, Ronald E. Griffiths, David J. Dean
2016, Conference Paper, River Flow 2016, Proceedings of the International Conference on Fluvial Hydraulics
We have developed a physically based method for using two acoustic frequencies to measure suspended-silt-and-clay concentration, suspended-sand concentration, and suspended-sand median grain size in river cross sections at 15-minute intervals over decadal timescales. The method is strongly grounded in the extensive scientific literature on the scattering of sound by...
Do water level fluctuations influence production of walleye and yellow perch young-of-the-year in large northern lakes?
James H. Larson, David F. Staples, Ryan P. Maki, Jon M. Vallazza, Brent C. Knights, Kevin E. Peterson
2016, North American Journal of Fisheries Management (36) 1425-1436
Many ecological processes depend on the regular rise and fall of water levels (WLs), and artificial manipulations to WL regimes can impair important ecosystem services. Previous research has suggested that differences in WL between late summer and early spring may alter the suitability of shoals used by Walleyes Sander vitreus...
Application of decision science to resilience management in Jamaica Bay
Mitchell J. Eaton, Angela K. Fuller, Fred A. Johnson, M. P. Hare, Richard C. Stedman
E.W. Sanderson, W. D. Solecki, J.R. Waldman, A. S. Paris, editor(s)
2016, Book chapter, Prospects for resilience: Insights from New York City's Jamaica Bay
This book highlights the growing interest in management interventions designed to enhance the resilience of the Jamaica Bay socio-ecological system. Effective management, whether the focus is on managing biological processes or human behavior or (most likely) both, requires decision makers to anticipate how the managed system will respond to...
Comment on “Reconciliation of the Devils Hole climate record with orbital forcing”
Tyler B. Coplen
2016, Science (354) 296-296
Moseley et al.’s (Reports, 8 January 2016, p. 165) preferred-Termination-II age is subjective, as evidenced by variation in their Termination-II ages of 2500 years per meter. Termination-II-age bias decreases to zero at ~1.5 meters below the present-day water table, if one assumes linear variation with core-sample height. Maintaining the required...
Chemical and isotopic changes in Williston Basin brines during long-term oil production: An example from the Poplar dome, Montana
Zell E. Peterman, Joanna N. Thamke
2016, AAPG Bulletin (100) 1619-1632
Brine samples were collected from 30 conventional oil wells producing mostly from the Charles Formation of the Madison Group in the East and Northwest Poplar oil fields on the Fort Peck Indian Reservation, Montana. Dissolved concentrations of major ions, trace metals, Sr isotopes, and stable isotopes (oxygen and hydrogen) were...
Microrefuges and the occurrence of thermal specialists: implications for wildlife persistence amidst changing temperatures
L. Embere Hall, Anna D. Chalfoun, Erik A. Beever, Anne E. Loosen
2016, Climate Change Responses (3) 1-12
BackgroundContemporary climate change is affecting nearly all biomes, causing shifts in animal distributions, phenology, and persistence. Favorable microclimates may buffer organisms against rapid changes in climate, thereby allowing time for populations to adapt. The degree to which microclimates facilitate the local persistence of climate-sensitive species,...
