Cenozoic tectonic evolution of the Ecemiş fault zone and adjacent basins, central Anatolia, Turkey during the transition from Arabia - Eurasia collision to escape tectonics
Paul J. Umhoefer, Stuart Thompson, Come Lefebre, Michael Cosca, Christian Teyssier, Donna L. Whitney
2020, Geosphere (16) 1358-1384
The effects of Arabia-Eurasia collision are recorded in faults, basins, and exhumed metamorphic massifs across eastern and central Anatolia. These faults and basins also preserve evidence of major changes in deformation and associated sedimentary processes along major suture zones including the Inner Tauride suture where it lies along the southern...
Statistical methods in water resources
Dennis R. Helsel, Robert M. Hirsch, Karen R. Ryberg, Stacey A. Archfield, Edward J. Gilroy
2020, Techniques and Methods 4-A3
This text began as a collection of class notes for a course on applied statistical methods for hydrologists taught at the U.S. Geological Survey (USGS) National Training Center. Course material was formalized and organized into a textbook, first published in 1992 by Elsevier as part of their Studies in Environmental...
Water resources in the Cheyenne and Arapaho Tribal jurisdictional area, west-central Oklahoma, with an analysis of data gaps through 2015
Carol Becker, Matthew S. Varonka
2020, Scientific Investigations Report 2020-5105
This report provides an overview of existing hydrologic information describing the quality, quantity, and extent of the major surface-water and groundwater resources in the Cheyenne and Arapaho Tribal jurisdictional area, west-central Oklahoma. Hydrologic information is provided for five major river systems (Cimarron River, North Canadian River, Canadian River, Washita River,...
Distribution of giant gartersnakes (Thamnophis gigas) in the Sacramento–San Joaquin Delta, California, 2018–2019
Kristen J. Fouts, Richard Kim, Anna C. Jordan, Alexandria M. Fulton, Jonathan P. Rose, Julia S. M. Ersan, Brian J. Halstead
2020, Open-File Report 2020-1119
SummaryWe examined the occurrence of giant gartersnakes in the Sacramento–San Joaquin Delta, California, in 2018 and 2019. We made eight captures of seven giant gartersnakes (three females, four males) in 2018, and six captures of six giant gartersnakes (four females, two males) in 2019. Detection probabilities were exceedingly low despite using methods...
Meeting the challenge: U.S. Geological Survey North Atlantic and Appalachian Region fiscal year 2020 in review
U.S. Geological Survey
2020, General Information Product 207
The utilization, preservation, and conservation of the Nation’s resources requires well-informed management decisions. The North Atlantic and Appalachian Region (NAAR) of the U.S. Geological Survey (USGS) supports science-based decision making for Federal, State, and local policymakers to meet the challenges of today and into the future. The science centers in...
Hydrogeology and groundwater flow in alluvial deposits, north Summerset, South Dakota
William G. Eldridge, Todd M. Anderson
2020, Scientific Investigations Report 2020-5097
The city of Summerset is a growing community in west South Dakota. The Sun Valley Estates subdivision in the north part of the city was developed on unconsolidated deposits surrounded by steep terrain. During years with greater than normal precipitation, particularly in 2019, groundwater levels increased in the unconsolidated deposits...
Outsized nutrient contributions from small tributaries to a Great Lake
Robert J Mooney, Emily H. Stanley, William C. Rosenthal, Peter C. Esselman, Anthony D Kendall, Peter B. McIntyre
2020, Proceedings of the National Academy of Sciences (117)
Excessive nutrient inputs from tributary streams and rivers contribute to harmful algal blooms and coastal ecosystem degradation worldwide. However, the role that small tributaries play in coastal nutrient dynamics remains unknown because most monitoring and regulatory efforts focus only on the largest tributaries. We combined a 6-d sampling...
Imperatives for predicting preferential and diffuse flow in the unsaturated zone: 1. Equal emphasis
John R. Nimmo
2020, Hydrological Processes (34) 5690-5693
No abstract available....
Imperatives for predicting preferential and diffuse flow in the unsaturated zone: 2. Disparate formulation
John R. Nimmo
2020, Hydrological Processes (34) 5694-5698
No abstract available....
Integrated geophysical analysis provides an alternate interpretation of the northern margin of the North American Midcontinent Rift System, Central Lake Superior
V. J. Grauch, Eric D. Anderson, Samuel J. Heller, Esther K. Stewart, Laurel G. Woodruff
2020, Interpretation (8) SS63-SS85
The Midcontinent Rift System (MRS) is a 1.1 Ga sequence of voluminous basaltic eruptions and multiple intrusions followed by widespread sedimentation that extends across the Midcontinent and northern Great Lakes region of North America. Previous workers have commonly used seismic-reflection data (Great Lakes International Multidisciplinary...
Lava–water interaction and hydrothermal activity within the 2014–2015 Holuhraun Lava Flow Field, Iceland
Colin M. Dundas, Laszlo P. Keszthelyi, Einat Lev, M. Elise Rumpf, Christopher W. Hamilton, Armann Hoskuldsson, Thorvaldur Thordarson
2020, Journal of Volcanology and Geothermal Research (408)
Lava that erupted during the 2014–2015 Holuhraun eruption in Iceland flowed into a proglacial river system, resulting in aqueous cooling of the lava and an ephemeral hydrothermal system. We carried out a monitoring study of this system from 2015 to 2018...
Thermokarst amplifies fluvial inorganic carbon cycling and export across watershed scales on the Peel Plateau, Canada
Scott Zolkos, Suzanne E. Tank, Robert G. Striegl, Steven V. Kokelj, Justin Kokszka, Cristian Estop-Aragones, David Olefeldt
2020, Biogeosciences (17) 5163-5182
As climate warming and precipitation increase at high latitudes, permafrost terrains across the circumpolar north are poised for intensified geomorphic activity and sediment mobilization that are expected to persist for millennia. In previously glaciated permafrost terrain, ice-rich deposits are associated with large stores of reactive mineral substrate. Over geological timescales,...
Distribution of aseismic deformation along the central San Andreas and Calaveras Faults from differencing repeat airborne lidar
Chelsea P Scott, Stephen B. DeLong, J Ramon Arrosmith
2020, Geophysical Research Letters (47)
Fault creep reduces seismic hazard and serves as a window into plate boundary processes; however, creep rates are typically constrained with sparse measurements. We use differential lidar topography (11–13 year time span) to measure a spatially dense surface deformation field along a 150 km section of the Central San Andreas and Calaveras...
Isolation and characterization of microsatellite loci in merlins (Falco columbarius) and cross-species amplification in gyrfalcons (F. rusticolus) and peregrine falcons (F. peregrinus)
Joshua M. Hull, George K. Sage, Sarah A. Sonsthagen, Megan C. Gravley, Breanna L. Martinico, Travis L. Booms, Ted Swem, Sandra L. Talbot
2020, Molecular Biology Reports (47) 8377-8383
I. Background: Merlins, Falco columbarius, breed throughout temperate and high latitude habitats in Asia, Europe, and North America. Like peregrine falcons, F. peregrinus, merlins underwent population declines during the mid-to-late 20th century, due to organochlorine-based contamination, and have subsequently recovered, at least in North American populations. II....
Characterization of acoustic detection efficiency using a gliding robotic fish as a mobile receiver platform
Osama Ennasr, Christopher Holbrook, Darryl W. Hondorp, Charles C. Krueger, Demetris Coleman, Pratap Solanki, John Thon, Xiaobo Tan
2020, Animal Biotelemetry (8)
BackgroundAutonomous underwater vehicles (AUVs) and animal telemetry have become important tools for understanding the relationships between aquatic organisms and their environment, but more information is needed to guide the development and use of AUVs as effective animal tracking platforms. A forward-facing acoustic telemetry receiver (VR2Tx 69 kHz; VEMCO, Bedford,...
Evaluation of the U.S. Geological Survey streamgage network in South Carolina, 2017
Toby D. Feaster, Katharine Kolb
2020, Open-File Report 2020-1104
The U.S. Geological Survey (USGS) has been monitoring streamflow in South Carolina since the late 1800s. From the beginning, the USGS streamgage network in South Carolina has been dynamic, with streamgages being added or removed depending on their purpose and the availability of funding from Federal, State, and local partners....
Chapter A6.2. Dissolved oxygen
U.S. Geological Survey
2020, Techniques and Methods 9-A6.2
The “National Field Manual for the Collection of Water-Quality Data” (NFM) provides guidelines and procedures for U.S. Geological Survey (USGS) personnel who collect data used to assess the quality of the Nation’s surface water and groundwater resources. This chapter, NFM A6.2, provides guidance and protocols for the measurement of dissolved...
Common insecticide disrupts aquatic communities: A mesocosm-to-field ecological risk assessment of fipronil and its degradates in U.S. streams
Janet L. Miller, Travis S. Schmidt, Peter C. Van Metre, Barbara Mahler, Mark W. Sandstrom, Lisa H. Nowell, Daren M. Carlisle, Patrick W. Moran
2020, Science Advances (6) eabc1299
Insecticides in streams are increasingly a global concern, yet information on safe concentrations for aquatic ecosystems is sparse. In a 30-day mesocosm experiment exposing native benthic aquatic invertebrates to the common insecticide fipronil and four degradates, fipronil compounds caused altered emergence and trophic cascades. Effect concentrations eliciting a 50% response...
A large database supports the use of simple models of post-fire tree mortality for thick-barked conifers, with less support for other species
C. Alina Cansler, Sharon M. Hood, Phillip J. van Mantgem, J. Morgan Varner
2020, Fire Ecology (16)
BackgroundPredictive models of post-fire tree and stem mortality are vital for management planning and understanding fire effects. Post-fire tree and stem mortality have been traditionally modeled as a simple empirical function of tree defenses (e.g., bark thickness) and fire injury (e.g., crown scorch). We used the Fire and Tree Mortality...
Double exposure and dynamic vulnerability: Assessing economic well-being, ecological change and the development of the oil and gas industry in coastal Louisiana
Scott Hemmerling, Tim J. B. Carruthers, Ann Hijuelos, Harris C. Bienn
2020, Shore & Beach (88) 72-82
The oil and gas industry has been a powerful driver of economic change in coastal Louisiana for the latter half of the 20th century and into the 21st. Yet, the overall impact of the industry on the economic well-being of host communities is varied, both spatially and temporally. While the...
Deglaciation of the Puget Lowland, Washington
Ralph A. Haugerud
2020, GSA Special Paper 548
Recently obtained radiocarbon ages from the southern Puget Lowland and reevaluation of limiting ages from the Olympic Peninsula in the light of new light detection and ranging (LiDAR) data suggest that the...
Larval diet of the rare caddisfly Glyphopsyche missouri (Trichoptera: Limnephilidae) in Missouri, USA
Russell G. Rhodes, Barry C. Poulton, William R. Mabee, David E. Bowles
2020, Proceedings of the Entomological Society of Washington (122) 1026-1030
No abstract available....
Diverse cataclysmic floods from Pleistocene glacial Lake Missoula
Roger P. Denlinger, David L. George, Charles M. Cannon, Jim E. O'Connor, Richard B. Waitt
2020, GSA Special Volume on Pleistocene megafloods (548)
In late Wisconsin time, the Purcell Trench lobe of the Cordilleran ice sheet dammed the Clark Fork of the Columbia River in western Montana, creating glacial Lake Missoula. During part of this epoch, the Okanogan lobe also dammed the Columbia River downstream, creating glacial Lake Columbia in northeast Washington. Repeated...
Geomorphic and sedimentary effects of modern climate change: Current and anticipated future conditions in the western United States
Amy E. East, Joel B. Sankey
2020, Reviews of Geophysics (58)
Hydroclimatic changes associated with global warming over the past 50 years have been documented widely, but physical landscape responses are poorly understood thus far. Detecting sedimentary and geomorphic signals of modern climate change presents challenges owing to short record lengths, difficulty resolving signals in stochastic natural systems, influences of land...
The nature and composition of the J-M Reef, Stillwater Complex, Montana, USA
Michael Jenkins, James E. Mungall, Michael L. Zientek, Paul Holick, Kevin Butak
2020, Economic Geology (115) 1799-1826
In this contribution, we analyze 30 years of mine development data and quantitatively identify the processes that control the grade and tenor of the mineralized rock. An assay database of more than 60,000 samples was used to examine variations in ore grade and tenor of...
