A. R. Wallace, D. A. Lindsey
1996, Miscellaneous Field Studies Map 2312-A
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Publication Extents
Not all publications have extents, not all extents are completely accurateDouglas K. Maurer, Ann K. Johnson, Alan H. Welch
1996, Water Supply Paper 2436
Operating Criteria and Procedures for Newlands Project irrigation and Public Law 101-618 could result in reductions in surface water used for agriculture in the Carson Desert, potentially affecting ground-water supplies from shallow, intermediate, and basalt aquifers. A near-surface zone could exist at the top of the shallow aquifer near the...
A. R. Wallace, S. J. Soulliere
1996, Miscellaneous Field Studies Map 2312-B
Wei Ji
1996, Conference Paper, IGARSS '96. 1996 International Geoscience and Remote Sensing Symposium
This paper describes a new approach using decision support GIS for handling information in ecosystem management. Technical research efforts resulted in specialized spatial decision support systems for wetland restoration planning, wetland permit analysis, and wildlife research and management. These applications are briefly presented to illustrate the usage of the methodology....
R.E. Abercrombie, J. Mori
1996, Nature (381) 303-307
Observations of foreshocks preceding large earthquakes provide one of the few well documented cases of premonitory events that are clearly related to a subsequent earthquake. Unfortunately, the apparent randomness of foreshock occurrence—they precede some events and not others—has severely hampered their use in reliable earthquake prediction. Understanding the factors that...
Craig A. Johnson, James McLelland, Michael P. Foose
1996, Geology (24) 475-477
No abstract available....
Edward E. Fischer
1996, Conference Paper
A total of 130 highway bridges in Iowa were assessed for potential scour using a potential-scour index developed by the U.S. Geological Survey for a bridge-scour study in western Tennessee. Greater values of the index, which is composed of 11 components,...
Mary K. Walker, Erik W. Zabel, Gun Akerman, Lennart Balk, Peggy J. Wright, Donald E. Tillitt
1996, Book chapter, Techniques in aquatic toxicology
In the environment, lipophilic contaminants such as halogenated aromatic hydrocarbons (HAHs, e.g., polychlorinated biphenyls, PCBs) and polycyclic aromatic hydrocarbons (PAHs, e.g., benzo[a]pyrene) readily bioaccumulate in fish, and the bioaccumulation of these lipophilic chemicals by adult fish may have significant consequences on the development and survival of their offspring. Halogenated and...
Diana M. Papoulias, Denny R. Buckler, Donald E. Tillitt
1996, Journal of Great Lakes Research (22) 584-590
Non-mutagenic components interfered with the ability of the standard Ames/salmonella assay to detect mutagenicity in extracts of contaminated Great Lakes sediments. The use of gel permeation chromatography (GPC) to remove these macromolecules from methylene chloride extracts prior to Ames testing enhanced the likelihood of transfer of mutagenic components into dimethyl...
Gary P. Johnson
1996, Conference Paper
No abstract available. ...
William C. Evans
1996, Nature (381) 114-115
No abstract available....
Jeffrey L. Marion, David N. Cole
1996, Ecological Applications (6) 520-530
We studied the impacts of camping on soil and vegetation at Delaware Water Gap national Recreation Area. We assessed the magnitude of impact on campsites that varied in amount of use and in topographic position. We also evaluated change over a 5-yr period on long-established, recently opened, and recently closed...
Penny Masuoka, William Acevedo, S. Fifer, Timothy W. Foresman, M. Tuttle
1996, Conference Paper, ASPRS/ACSM Annual Convention and Exhibition, Baltimore, Md., 22–25 April 1996, Proceedings
No abstract available....
Stephen C. Komor, Joseph A. Magner
1996, Water Resources Research (32) 1039-1050
This study evaluates processes that affect nitrate concentrations in groundwater beneath riparian zones in an agricultural watershed. Nitrate pathways in the upper 2 m of groundwater were investigated beneath wooded and grass-shrub riparian zones next to cultivated fields. Because trees can be important components of the overall nitrate pathway in...
Susan C. Clark, John Starr, Timothy W. Foresman, William Acevedo, Carol Solomon
1996, Conference Paper, ASPRS/ACSM Annual Convention and Exhibition, Baltimore, Md., 20–26 April 1996, Proceedings
The U.S. Geological Survey is participating in a joint effort with the University of Maryland Baltimore County and other government agencies to construct a dynamic database of urban development for the Baltimore-Washington region from the late-1700's to the 1990's. The multi-theme temporal database includes a principal transportation data layer that...
William Acevedo, Timothy W. Foresman, Janis T. Buchanan
1996, Conference Paper, Annual Convention and Exhibition, Baltimore, Md., 22–25 April 1996, Proceedings
The U.S. Geological Survey (USGS), in partnership with the University of Maryland Baltimore County, is using historical maps and satellite images to map human-induced land transformations for the Baltimore-Washington metropolitan area. This work builds on an earlier effort that documented the historical urban development for the San Francisco Bay area....
Keith Loague, R. L. Bernknopf, R. E. Green, T. W. Giambelluca
1996, Journal of Environmental Quality (25) 475-490
There are important challenges associated with assessing potential groundwater vulnerability hazards that may result from regional scale applications of agrochemicals. The increasing availability of Geographic Information System (GIS) software to those involved in assisting with landuse decisions has resulted in the widespread production of multicolored risk management maps for many...
Donal R. Mullineaux
1996, Professional Paper 1563
More than 100 tephra-fall deposits erupted from Mount St. Helens within about the last 40,000 years are grouped into tephra sets and layers distinguished from each other chiefly by differences in mineral composition and age. The tephra deposits record a complex history of the volcano, form important time-stratigraphic markers, and...
Van S. Williams, Gary I. Selner, Richard B. Taylor
1996, Open-File Report 96-7
Sandra J. Owen-Joyce, Lee H. Raymond
1996, Water Supply Paper 2407
An accounting system for estimating and distributing consumptive use of water by vegetation to water users was developed for the Colorado River to meet the requirements of a U.S. Supreme Court decree and used with data from calendar year 1984. The system is based on a water-budget method to estimate...
K. B. Ketner, B.L. Murchey, R.G. Stamm, B. R. Wardlaw
1996, IMAP 2535
Cynthia Dusel-Bacon, Elizabeth O. Doyle, Stephen E. Box
1996, Professional Paper 1497-B
The oldest dated metamorphic sequence in Alaska, the fault-bounded Kilbuck Terrane, consists of continental rocks that were metamorphosed under amphibolite-facies conditions during early Proterozoic (1.77 Ga) time. Proterozoic or early Paleozoic metamorphic ages are also possible for greenschist- and amphibolite-facies continental rocks in interior Alaska (Ruby and Nixon Fork terranes)....
Cynthia Dusel-Bacon, D. A. Brew, S. L. Douglass
1996, Professional Paper 1497-D
Nearly all of the bedrock in Southeastern Alaska has been metamorphosed, much of it under medium-grade conditions during metamorphic episodes that were associated with widespread plutonism. The oldest metamorphisms affected probable arc rocks near southern Prince of Wales Island and occurred during early and middle Paleozoic orogenies. The predominant period...
P.J. Wigington Jr., J.P. Baker, David R. DeWalle, W.A. Kretser, Peter S. Murdoch, H. A. Simonin, J. Van Sickle, M.K. Mcdowell, D.V. Peck, W.R. Barchet
1996, Ecological Applications (6) 374-388
The Episodic Response Project (ERP) was an interdisciplinary study designed to address uncertainties about the occurrence, nature, and biological effects of episodic acidification of streams in the northeastern United States. The ERP research consisted of intensive studies of the chemistry and biological effects of episodes in 13 streams draining forested...
Jean L. Ryder
1996, Open-File Report 96-4