Estimating locations and total magnetization vectors of compact magnetic sources from scalar, vector, or tensor magnetic measurements through combined Helbig and Euler analysis
J. D. Phillips, M.N. Nabighian, D.V. Smith, Y. Li
2007, Conference Paper, SEG Technical Program Expanded Abstracts
The Helbig method for estimating total magnetization directions of compact sources from magnetic vector components is extended so that tensor magnetic gradient components can be used instead. Depths of the compact sources can be estimated using the Euler equation, and their dipole moment magnitudes can be estimated using a least...
Evaluating the accotink creek restoration project for improving water quality, in-stream habitat, and bank stability
S.D. Struck, A. Selvakumar, K. Hyer, T. O’Connor
2007, Conference Paper, Examining the Confluence of Environmental and Water Concerns - Proceedings of the World Environmental and Water Resources Congress 2006
Increased urbanization results in a larger percentage of connected impervious areas and can contribute large quantities of stormwater runoff and significant quantities of debris and pollutants (e.g., litter, oils, microorganisms, sediments, nutrients, organic matter, and heavy metals) to receiving waters. To improve water quality in urban and suburban areas, watershed...
A virus in a fungus in a plant: Three-way symbiosis required for thermal tolerance
L.M. Marquez, R. S. Redman, R. J. Rodriguez, M.J. Roossinck
2007, Science (315) 513-515
A mutualistic association between a fungal endophyte and a tropical panic grass allows both organisms to grow at high soil temperatures. We characterized a virus from this fungus that is involved in the mutualistic interaction. Fungal isolates cured of the virus are unable to confer heat tolerance, but heat tolerance...
Herpetofaunal Inventories of the National Parks of South Florida and the Caribbean: Volume IV. Biscayne National Park
Kenneth G. Rice, J. Hardin Waddle, Marquette E. Crockett, Christopher D. Bugbee, Brian M. Jeffery, H. Franklin Percival
2007, Open-File Report 2007-1057
Amphibian declines and extinctions have been documented around the world, often in protected natural areas. Concern for this alarming trend has prompted the U.S. Geological Survey and the National Park Service to document all species of amphibians that occur within U.S. National Parks and to search for any signs that...
Monitoring post-fire vegetation rehabilitation projects: A common approach for non-forested ecosystems
Troy A. Wirth, David A. Pyke
2007, Scientific Investigations Report 2006-5048
Emergency Stabilization and Rehabilitation (ES&R) and Burned Area Emergency Response (BAER) treatments are short-term, high-intensity treatments designed to mitigate the adverse effects of wildfire on public lands. The federal government expends significant resources implementing ES&R and BAER treatments after wildfires; however, recent reviews have found that existing data from monitoring...
New life for the Colorado River Delta
Pamela L. Nagler
R.S. Felger, Bill Broyles, editor(s)
2007, Book chapter, Dry borders: Great natural reserves of the Sonoran Desert
No abstract available....
Whales and whaling in the North Pacific Ocean and Bering Sea: Oceanographic insights and ecosystem impacts chapter 19
A. Springer, Gus B. Van Vliet, J. Pratt, E.M. Danner
J. A. Estes, D.P. DeMaster, Daniel F. Doak, editor(s)
2007, Book chapter, Whales, Whaling and ocean Ecosystems
Chapter B. Physical, Chemical, and Biological Responses of Streams to Increasing Watershed Urbanization in the Piedmont Ecoregion of Georgia and Alabama, 2003
M. Brian Gregory, Daniel L. Calhoun
2007, Scientific Investigations Report 2006-5101-B
As part of the U.S. Geological Survey National Water-Quality Assessment Program?s effort to assess the physical, chemical, and biological responses of streams to urbanization, 30 wadable streams were sampled near Atlanta, Ga., during 2002?2003. Watersheds were selected to minimize natural factors such as geology, altitude, and climate while representing a...
Initial report of the IMAGES VIII/PAGE 127 gas hydrate and paleoclimate cruise on the RV Marion Dufresne in the Gulf of Mexico, 2-18 July 2002
William J. Winters, T.D. Lorenson, Charles K. Paull
2007, Open-File Report 2004-1358
The northern Gulf of Mexico contains many documented gas hydrate deposits near the sea floor. Although gas hydrate often is present in shallow subbottom sediment, the extent of hydrate occurrence deeper than 10 meters below sea floor in basins away from vents and other surface expressions is unknown. We obtained...
Studies on Disinfection By-Products and Drinking Water
Colleen E. Rostad
2007, Fact Sheet 2004-3032
Drinking water is disinfected with chemicals to remove pathogens, such as Giardia and Cryptosproridium, and prevent waterborne diseases such as cholera and typhoid. During disinfection, by-products are formed at trace concentrations. Because some of these by-products are suspected carcinogens, drinking water utilities must maintain the effectiveness of the disinfection process...
Geology and Mineral Resources of the East Mojave National Scenic Area, San Bernardino County, California
Ted G. Theodore, editor(s)
2007, Miscellaneous Field Studies Map 2414
From our evaluations that largely used model-based criteria, we conclude that much of the East Mojave National Scenic Area (EMNSA) contains significant indications of epigenetic mineralization of various types. Economically significant concentrations of many metals may possibly remain to be discovered in many parts of the EMNSA (see also Wetzel...
Geology and Mineral Resources of the East Mojave National Scenic Area, San Bernardino County, California
Ted G. Theodore, editor(s)
2007, Bulletin 2160
The rocks of the East Mojave National Scenic Area (EMNSA) record a history of dynamic geologic events that span more than 1,800 million years (m.y.). These geologic events contributed significantly to development of the spectacular vistas and panoramas present in the area today. The oldest rocks underlie much of the...
Exploring links between systematics and fisheries management
Jay R Stauffer, Patrick M. Kocovsky
2007, Transactions of the American Fisheries Society (136) 1122-1125
We argue that the sustainable management of fisheries resources depends on an understanding of the taxonomy and systematics of fish. Toward this end, it is necessary for fisheries managers to understand and apply the various species concepts that have been developed by taxonomists and evolutionary biologists and to decide, based...
Maps of Quadrangles 3060 and 2960, Qala-I-Fath (608), Malek-Sayh-Koh (613), and Gozar-E-Sah (614) Quadrangles, Afghanistan
Water Resources Division, U.S. Geological Survey
2007, Open-File Report 2005-1121
By selecting one of the four series options shown below, namely, -A, -B, -C, and -D for the geologic, topographic, Landsat natural-color, and Landsat false-color maps, respectively, the user will be taken to that map....
Maps of Quadrangles 3062 and 2962, Charburjak (609), Khanneshin (610), Gawdezereh (615), and Galachah (616) Quadrangles, Afghanistan
Water Resources Division, U.S. Geological Survey
2007, Open-File Report 2005-1122
By selecting one of the four series options shown below, namely, -A, -B, -C, and -D for the geologic, topographic, Landsat natural-color, and Landsat false-color maps, respectively, the user will be taken to that map....
USGS Fire Science: Fire Danger Monitoring and Forecasting
Jeff Eidenshink
2007, Fact Sheet 2005-3066
The U.S. Geological Survey (USGS) has advanced the use of moderate-resolution satellite data in a decision support system for assessing national fire potential. Weekly updated digital images of the Normalized Difference Vegetation Index (NDVI), based on data acquired at 1-kilometer (km) resolution (about 0.6 mi), have been used for the...
Demographic analysis of adult Lost River suckers and shortnose suckers in Upper Klamath Lake and its tributaries, Oregon. Annual report 2006
E.C. Janney, P.M. Barry, B.S. Hayes, R.S. Shively, A. Scott
2007, Report
n/a...
Modeling low-temperature geochemical processes
D. Kirk Nordstrom
J.I. Drever, editor(s)
2007, Book chapter, Treatise on geochemistry
No abstract available. ...
Integrated investigations of environmental effects of historical mining in the Animas River Watershed, San Juan County, Colorado
Stan E. Church, Paul Von Guerard, Susan E. Finger, editor(s)
2007, Professional Paper 1651
This publication comprises a Volume Contents of chapters (listed below) and a CD-ROM of data (contents shown in column at right). The Animas River watershed in southwest Colorado is one of many watersheds in the western United States where historical mining has left a legacy of acid mine drainage and elevated...
Regional Studies of the Potwar Plateau Area, Northern Pakistan
Peter D. Warwick, Bruce R. Wardlaw
2007, Bulletin 2078
The papers in this volume are products of a cooperative program between the Geological Survey of Pakistan (GSP) and the U.S. Geological Survey (USGS), sponsored by the Government of Pakistan and the U.S. Agency for International Development. The focus of the program, the Coal Resources Exploration and Assessment Program (COALREAP),...
Mineral Commodity Summaries 2007
Water Resources Division, U.S. Geological Survey
2007, Mineral Commodity Summaries 2007
Published on an annual basis, this report is the earliest Government publication to furnish estimates covering nonfuel mineral industry data. Data sheets contain information on the domestic industry structure, Government programs, tariffs, and 5-year salient statistics for over 90 individual minerals and materials....
Buffelgrass (Pennisetum ciliare) land conversion and productivity in the plains of Sonora, Mexico
Kim A. Franklin, Kelly Lyons, Pamela L. Nagler, Derrick Lampkin, Edward P. Glenn, Francisco Molina-Freaner, Therese Markow, Alfredo R Huete
2006, Biological Conservation (127) 62-71
Bufflelgrass (Pennisetum ciliare syn. Cenchrus ciliaris) is an African grass that has been widely introduced in subtropical arid regions of the world to improve rangelands for cattle production. However, it can have a negative effect on the diversity of native plant communities. Buffelgrass was introduced to Sonora, Mexico in the 1970s as...
Use of an ADCP to compute suspended-sediment discharge in the tidal Hudson River, New York
Gary R. Wall, Elizabeth A. Nystrom, Simon Litten
2006, Scientific Investigations Report 2006-5055
Acoustic Doppler current profilers (ADCPs) can provide data needed for computation of suspended-sediment discharge in complex river systems, such as tidal rivers, in which conventional methods of collecting time-series data on suspended-sediment concentration (SSC) and water discharge are not feasible. Although ADCPs are not designed to measure SSC, ADCP data...
Distribution and abundance of California giant salamander (Dicamptodon ensatus) and signal crayfish (Pacifastacus leniusculus) in the Upper Redwood Creek Watershed, Marin County, California
Darren Fong, Judd A. Howell
2006, Open-File Report 2006-1066
A survey was conducted in 1997-1998 to identify the distribution of non-native signal crayfish (Pacifastacus leniusculus) and larval California giant salamanders (Dicamptodon ensatus) within the upper Redwood Creek watershed (Marin County, California). The crayfish is widely distributed along the mainstem Redwood Creek. It was found in lower Fern Creek but...
Assessing and Understanding Trail Degradation: Results from Big South Fork National River and Recreational Area
J. L. Marion, N. Olive
2006, Report
This report describes results from a comprehensive assessment of resource conditions on a large (24%) sample of the trail system within Big South Fork National River and Recreational Area (BSF). Components include research to develop state-of-knowledge trail impact assessment and monitoring methods, application of survey methods to BSF trails,...
