Augusta Warden
Science and Products
Stable Isotope Natural Gas Reference Materials
Please send an email expressing interest in the HCG Gas Reference Materials to either awarden@usgs.gov, mdreier@usgs.gov, or mcuara@usgs.gov and you will be contacted prior to the next...
Petroleum Geochemistry Research Laboratory
The Petroleum Geochemistry Research Laboratory (PGRL) provides analytical capabilities and technical expertise in support of research and assessment projects within the Energy Resource Program (ERP) with a commitment to the provision of quality petroleum organic geochemistry and mineralogy data. PGRL is active in the development and in the distribution of petroleum organic geochemistry rock...
Incipient bed-movement and flood-frequency analysis using hydrophones to estimate flushing flows on the upper Colorado River, Colorado, 2019
In 2019, the U.S. Geological Survey, in cooperation with the Upper Colorado River Wild and Scenic Stakeholder Group, studied the magnitude and recurrence interval of streamflow (discharge) needed to initiate bed movement of gravel-sized and finer sediment in a segment of the Colorado River in Colorado to better understand sediment movement and its...
Kohn, Michael S.; Marineau, Mathieu D.; Hempel, Laura A.; McDonald, Richard R.
Calibration of the U.S. Geological Survey National Crustal Model
The U.S. Geological Survey National Crustal Model (NCM) is being developed to include spatially varying estimates of site response in seismic hazard assessments. Primary outputs of the NCM are continuous velocity and density profiles from the Earth’s surface to the mantle transition zone at 410-kilometer (km) depth for each location on a 1-km grid...
Boyd, Oliver S.
seawaveQ—An R package providing a model and utilities for analyzing trends in chemical concentrations in streams with a seasonal wave (seawave) and adjustment for streamflow (Q) and other ancillary variables, version 2.0.0
The seawaveQ R package provides functionality and help to fit a parametric regression model, SEAWAVE-Q, to pesticide concentration data from stream-water samples to assess trends. The model incorporates the strong seasonality and high degree of censoring common in pesticide data, and users can incorporate numerous ancillary variables such as...
Ryberg, Karen R.; York, Benjamin C.
Estimating streamflow and base flow within the nontidal Chesapeake Bay riverine system
Daily mean streamflow was estimated for all the nontidal parts of the Chesapeake Bay riverine system with the Unit Flows in Networks of Channels computer application using measured streamflow at the most downstream gage of selected rivers. The streamflows estimated by the Unit Flows in Networks of Channels computer application were aggregated at...
Buffington, Patrick C.; Capel, Paul D.
Estimates of groundwater discharge by evapotranspiration, Stump Spring and Hiko Springs, Clark County, southern Nevada, 2016–18
This report documents methodology and results of a study that estimated groundwater discharge by evapotranspiration (GWET) from phreatophytic vegetation in two desert riparian areas with ephemeral spring discharge in Clark County, southern Nevada. The phreatophytes consisted primarily of western honey mesquite [Prosopis glandulosa var. ...
Moreo, Michael T.; Buto, Susan G.; Smith, David W.; Nelson, Nora C.
Biotelemetry data for Golden Eagles (Aquila chrysaetos) captured in coastal southern California, February 2017–December 2019
Because of a lack of clarity about the status of golden eagles (Aquila chrysaetos) in coastal southern California, the U.S. Geological Survey, in collaboration with U.S. Fish and Wildlife Service, California Department of Fish and Wildlife, Bureau of Land Management, and San Diego Management and Monitoring Program, began a multi-year survey and...
Tracey, Jeff A.; Madden, Melanie C.; Molden, James C.; Sebes, Jeremy B.; Bloom, Peter H.; Fisher, Robert N.
Geochemical assessment of the Hueco Bolson, New Mexico and Texas, 2016–17
Understanding groundwater quality in transboundary aquifers like the Hueco Bolson is important for the 2.7 million people along the United States and Mexico border living in and near the combined metropolitan areas of Ciudad Juárez, Mexico, and El Paso, Texas, who rely on groundwater for water supply. To better understand water-quality conditions...
Ging, Patricia B.; Humberson, Delbert G.; Ikard, Scott J.
Assessment of water and proppant quantities associated with petroleum production from the Eagle Ford Group, Gulf Coast, Texas, 2019
Building on a geology-based assessment of undiscovered, technically recoverable petroleum resources in the Eagle Ford Group in south Texas, the U.S. Geological Survey has estimated the required water and proppant demands and formation water production volumes associated with possible future development of these petroleum resources. The results of...
Gianoutsos, Nicholas J.; Haines, Seth S.; Varela, Brian A.; Whidden, Katherine J.; Birdwell, Justin E.; Burke, Lauri A.; Drake, Ronald M.; Finn, Thomas M.; French, Katherine L.; Jenni, Karen E.; Kinney, Scott A.; Le, Phuong A.; Leathers-Miller, Heidi M.; Marra, Kristen R.; Mercier, Tracey J.; Paxton, Stanley T.; Pitman, Janet K.; Schenk, Christopher J.; Shaffer, Brian N.; Shorten, Chilisa M.; Tennyson, Marilyn E.; Woodall, Cheryl A.
Quality of pesticide data for groundwater analyzed for the National Water-Quality Assessment Project, 2013–18
The National Water-Quality Assessment (NAWQA) Project of the U.S. Geological Survey (USGS) submitted nearly 1,900 samples collected from groundwater sites across the United States in 2013–18 for analysis of 225 pesticide compounds (pesticides and pesticide degradates, hereafter referred to as “pesticides”) by USGS National Water Quality Laboratory...
Bexfield, Laura M.; Belitz, Kenneth; Sandstrom, Mark W.; Beaty, Delicia; Medalie, Laura; Lindsey, Bruce D.; Nowell, Lisa H.
Assessing the influence of natural copper-nickel-bearing bedrocks of the Duluth Complex on water quality in Minnesota, 2013–15
The U.S. Geological Survey, in cooperation with the University of Minnesota-Duluth Natural Resources Research Institute, completed an assessment of regional water quality in areas of potential base-metal mining in Minnesota. Bedrock, soil, streambed sediment, and surface-water samples were collected in three watersheds that cross the basal part of...
Elliott, Sarah M.; Jones, Perry M.; Woodruff, Laurel G.; Jennings, Carrie E.; Krall, Aliesha L.; Morel, Daniel L.
Citizen science collaboration with the U.S. Geological Survey in Alaska
Citizen science is science undertaken by the public, usually in collaboration with professional scientific institutions. It encourages citizens to tackle real-world scientific problems and augments traditional science by expanding the coverage of data collection and by reducing costs of fieldwork in remote locations. Information collected by...
Powers, Elizabeth; Williams, Dee
A not so sudden impact—Historical relations between conifers and insects can help predict damage by nonnative insects
The arrival and establishment of nonnative insects in North America is increasingly problematic. International trade has created opportunities to move wood products and nursery stock worldwide, which has increased the risk of insect introduction to regions or countries where they are not native. One group of researchers,...
Durden, Lekeah A.; Schulz, Ashley N.; Mech, Angela M.; Thomas, Kathryn A.