Publications
Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center
Filter Total Items: 2357
Report from Ground Zero: How geoscientists aid in the aftermath of environmental disasters
People around the world remember when they first learned of the attacks on New York City’s World Trade Center towers on Sept. 11, 2001. For me, the memories are vivid — my feelings of shock, horror and sadness were similarly etched on the faces of all the attendees of a mining and the environment workshop in Buenos Aires, Argentina, where I was speaking. At that time, I had no idea that our small
Authors
Geoffrey S. Plumlee
Deep Resistivity Structure of Mid Valley, Nevada Test Site, Nevada
The U.S. Department of Energy (DOE) and the National Nuclear Security Administration (NNSA) at their Nevada Site Office (NSO) are addressing ground-water contamination resulting from historical underground nuclear testing through the Environmental Management (EM) program and, in particular, the Underground Test Area (UGTA) project.
From 1951 to 1992, 828 underground nuclear tests were conducted
Authors
Erin L. Wallin, Brian D. Rodriguez, Jackie M. Williams
Hydrogeology of the Columbia River Basalt Group in the northern Willamette Valley
No abstract available.
Authors
W Burt, Terrence D. Conlon, T.L. Tolan, R. E. Wells, J Melady
Inversion of multichannel geophysical data with projected kernels
Statistical de‐noising methods such as Principal Component Analysis modify data in a way not constrained by physics. In much the same way as frequency‐filtered data must incorporate altered frequency content into numerical interpretation, so must statistically rotated data include the rotation operator in inversion processes. We propose a method of accounting for statistical reduction of data in n
Authors
M. Andy Kass, Trevor P. Irons, Yaoguo Li
Preliminary Geologic Map of the Buxton 7.5' Quadrangle, Washington County, Oregon
This map, compiled from previously published and unpublished data, and new mapping by the authors, represents the general distribution of bedrock and surficial deposits of the Buxton 7.5-minute quadrangle. The database delineates map units that are identified by general age and lithology following the stratigraphic nomenclature of the U.S. Geological Survey. The scale of the source maps limits the
Authors
Philip A. Dinterman, Alison R. Duvall
Geologic Map of the Carlton Quadrangle, Yamhill County, Oregon
The Carlton, Oregon, 7.5-minute quadrangle is located in northwestern Oregon, about 35 miles (57 km) southwest of Portland. It encompasses the towns of Yamhill and Carlton in the northwestern Willamette Valley and extends into the eastern flank of the Oregon Coast Range. The Carlton quadrangle is one of several dozen quadrangles being mapped by the U.S. Geological Survey (USGS) and the Oregon Depa
Authors
Karen L. Wheeler, Ray E. Wells, Joseph M. Minervini, Jessica L. Block
Quantifying the undiscovered geothermal resources of the United States
In 2008, the U.S. Geological Survey (USGS) released summary results of an assessment of the electric power production potential from the moderate- and high-temperature geothermal resources of the United States (Williams et al., 2008a; USGS Fact Sheet 2008-3082; http://pubs.usgs.gov/fs/2008/3082). In the assessment, the estimated mean power production potential from undiscovered geothermal resource
Authors
Colin F. Williams, Marshall J. Reed, Jacob DeAngelo, S. Peter Galanis
Magma evolution and ascent at the craters of the moon and neighboring volcanic fields, southern Idaho, USA: Implications for the evolution of polygenetic and monogenetic volcanic fields
The evolution of polygenetic and monogenetic volcanic fields must reflect differences in magma processing during ascent. To assess their evolution we use thermobarometry and geochemistry to evaluate ascent paths for neighboring, nearly coeval volcanic fields in the Snake River Plain, in south-central Idaho, derived from (1) dominantly Holocene polygenetic evolved lavas from the Craters of the Moon
Authors
Keith D. Putirka, Mel A. Kuntz, Daniel M. Unruh, Nitin Vaid
Digital coordinates and age for 3,869 foraminifer samples collected by Chevron Petroleum geologists in Washington and Oregon
The general location and age of more than 33,500 mostly foraminifer samples from Chevron Petroleum Company surface localities in California were provided by Brabb and Parker (2003, 2005). Malmborg and others (2008) provided digital latitude, longitude, and age for more than 13,000 of these samples. We provide here for the first time the digital latitude, longitude, and age for nearly 4,000 Chevron
Authors
William B. West, Earl E. Brabb, William T. Malmborg, John M. Parker
Foreword: A virtual congress on palaeolimnology—Palaeolimnological proxies as tools for environmental reconstruction in fresh water
No abstract available.
Authors
Krisztina Buczkó, János Korponai, Judit Padisák, Scott W. Starratt
High-Resolution Aeromagnetic Survey To Image Shallow Faults, Poncha Springs and Vicinity, Chaffee County, Colorado
High-resolution aeromagnetic data were acquired over the town of Poncha Springs and areas to the northwest to image faults, especially where they are concealed. Because this area has known hot springs, faults or fault intersections at depth can provide pathways for upward migration of geothermal fluids or concentrate fracturing that enhances permeability. Thus, mapping concealed faults provides a
Authors
V. J. S. Grauch, Benjamin J. Drenth
Geophysical Studies in the Vicinity of the Warner Mountains and Surprise Valley, Northeast California, Northwest Nevada, and Southern Oregon
From May 2006 to August 2007, the U.S. Geological Survey (USGS) collected 793 gravity stations, about 102 line-kilometers of truck-towed and ground magnetometer data, and about 325 physical-property measurements in northeastern California, northwestern Nevada, and southern Oregon. Gravity, magnetic, and physical-property data were collected to study regional crustal structures and geology as an ai
Authors
David A. Ponce, Jonathan M. G. Glen, Anne E. Egger, Claire Bouligand, Janet T. Watt, Robert L. Morin