Geologic Maps of the Dardanus Sulcus (Jg-6), Misharu (Jg-10), Nabu (Jg-11), and Namtar (Jg-14) Quadrangles of Ganymede
Ted A. Maxwell, Ursula B. Marvin
2001, IMAP 2642
Ganymede is the largest (~5,200 km diameter) of the Jovian satellites. Surficial features on Ganymede, as recorded by the Voyager 1 and 2 spacecraft (Smith and others, 1979a; 1979b), indicate a complex history of crustal formation. Several episodes of crustal modification led to the formation of curvilinear systems of furrows...
Geochemical results of a hydrothermally altered area at Baker Creek, Blaine County, Idaho
James A. Erdman, Falma J. Moye, Paul K. Theobald, Anne E. McCafferty, Richard K. Larsen
2001, Bulletin 2064-GG
The area immediately east of Baker Creek, Blaine County, Idaho, is underlain by a thick section of mafic to intermediate lava flows of the Eocene Challis Volcanic Group. Widespread propylitic alteration surrounds a zone of argillic alteration and an inner core of phyllic alteration. Silicified breccia is present along an east-trending...
Gas hydrate estimation error associated with uncertainties of measurements and parameters
Myung W. Lee, Timothy S. Collett
2001, Bulletin 2182
Downhole log measurements such as acoustic or electrical resistivity logs are often used to estimate in situ gas hydrate concentrations in sediment pore space. Estimation errors owing to uncertainties associated with downhole measurements and the parameters for estimation equations (weight in the acoustic method and Archie?s parameters in the resistivity method) are analyzed in order to...
Montana geoenvironmental explorer
Greg K. Lee
2001, Data Series 65
This report is the result of a multidisciplinary effort to assess relative potential for acidic, metal-rich drainage in the State of Montana; evaluate alternative GIS-based modeling strategies; and provide the statewide digital spatial data produced and compiled for the project. The CD is usable on various computer systems (Windows 95,...
A data management life-cycle
David A. Ferderer
2001, Fact Sheet 163-00
Documented, reliable, and accessible data and information are essential building blocks supporting scientific research and applications that enhance society's knowledge base (fig. 1). The U.S. Geological Survey (USGS), a leading provider of science data, information, and knowledge, is uniquely positioned to integrate science and natural resource information to address societal...
Coastal vulnerability to sea-level rise: a preliminary database for the U.S. Atlantic, Pacific, and Gulf of Mexico coasts
Erika S. Hammar-Klose, E. Robert Thieler
2001, Data Series 68
The prediction of coastal evolution is not straightforward. There is no standard methodology, and even the kind of data required to make such predictions are the subject of much scientific debate. Since a viable, quantitative predictive model for coastal evolution is not available. The relative susceptibility of the Nation's coastline...
Geologic map of the Chewelah 30' x 60' Quadrangle, Washington and Idaho
F. K. Miller
2001, Miscellaneous Field Studies Map 2354
This data set maps and describes the geology of the Chewelah 30' X 60' quadrangle, Washington and Idaho. Created using Environmental Systems Research Institute's ARC/INFO software, the data base consists of the following items: (1) a map coverage containing geologic contacts and units, (2) a point coverage containing site-specific geologic...
Geologic map and map database of the Spreckels 7.5-minute Quadrangle, Monterey County, California
Joseph C. Clark, Earl E. Brabb, Lewis I. Rosenberg, Heather V. Goss, Sarah E. Watkins
2001, Miscellaneous Field Studies Map 2349
Introduction The Spreckels quadrangle lies at the north end of the Sierra de Salinas and extends from the Salinas Valley on the northeast across Los Laurelles Ridge south to Carmel Valley, an intermontane valley that separates the Santa Lucia Range from the Sierra de Salinas (fig. 1). The Toro Regional Park...
Model coupling intraparticle diffusion/sorption, nonlinear sorption, and biodegradation processes
Hrissi K. Karapanagioti, Chris M. Gossard, Keith A. Strevett, Randall L. Kolar, David A. Sabatini
2001, Journal of Contaminant Hydrology (48) 1-21
Diffusion, sorption and biodegradation are key processes impacting the efficiency of natural attenuation. While each process has been studied individually, limited information exists on the kinetic coupling of these processes. In this paper, a model is presented that couples nonlinear and nonequilibrium sorption (intraparticle diffusion) with biodegradation kinetics. Initially, these...
Strontium isotope evolution of pore water and calcite in the Topopah Spring Tuff, Yucca Mountain, Nevada
Brian D. Marshall, Kiyoto Futa
2001, Report
Yucca Mountain, a ridge of Miocene volcanic rocks in southwest Nevada, is being characterized as a site for a potential high-level radioactive waste repository. One issue of concern for the future performance of the potential repository is the movement of water in and around the potential repository horizon. Past water...
Simulation of ground-water discharge to Biscayne Bay, southeastern Florida
Christian D. Langevin
2001, Water-Resources Investigations Report 2000-4251
As part of the Place-Based Studies Program, the U.S. Geological Survey initiated a project in 1996, in cooperation with the U.S. Army Corps of Engineers, to quantify the rates and patterns of submarine ground-water discharge to Biscayne Bay. Project objectives were achieved through field investigations at three sites (Coconut Grove,...
The importance of competition in regulating plant species abundance along a salinity gradient
M. K. Greiner La Peyre, James B. Grace, E. Hahn, I.A. Mendelssohn
2001, Ecology (82) 62-69
Current theories differ in their predictions concerning the effects of interspecific interactions on species growth and distribution along environmental gradients. In this study, we examined the influence of competition on species composition across a salinity gradient. This work involved three common fresh and brackish marsh species. The three species, Spartina patens,...
Knickzone propagation in the Black Hills and northern High Plains: A different perspective on the late Cenozoic exhumation of the Laramide Rocky Mountains
Brent J. Zaprowski, Edward B. Evenson, Frank J. Pazzaglia, Jack B. Epstein
2001, Geology (29) 547-550
Geomorphic research in the Black Hills and northern High Plains poses an intriguing hypothesis for the Cenozoic evolution of this salient of the Laramide Rockies. Most recently, geologists have appealed to late Cenozoic epeirogenic uplift or climate change to explain the post-Laramide unroofing of the Rockies. On the basis of...
Carbon balance of the terrestrial biosphere in the twentieth century: analyses of CO2, climate and land use effects with four process-based ecosystem models
A. D. McGuire, S. Sitch, Joy S. Clein, R. Dargaville, G. Esser, J. Foley, Martin Heimann, F. Joos, J. Kaplan, D. W. Kicklighter, R.A. Meier, J. M. Melillo, B. Moore III, I. C. Prentice, N. Ramankutty, T. Reichenau, A. Schloss, H. Tian, L.J. Williams, U. Wittenberg
2001, Global Biogeochemical Cycles (15) 183-206
The concurrent effects of increasing atmospheric CO2 concentration, climate variability, and cropland establishment and abandonment on terrestrial carbon storage between 1920 and 1992 were assessed using a standard simulation protocol with four process-based terrestrial biosphere models. Over the long-term(1920–1992), the simulations yielded a time history of terrestrial uptake that is...
Utilizing Mars Digital Image Model (MDIM) and Mars Orbiter laser Altimeter (MOLA) data for photogrammetric control
Mark R. Rosiek, Randolph L. Kirk, Trent M. Hare, Elpitha Howington-Kraus
2001, Conference Paper, Planetary Mapping: ISPRS Working Group IV/9 Workshop Proceedings
The USGS is producing digital elevation models (DEM) and topographic maps of Mars at scales of 1:250,000 to 1:1,000,000. The initial source material will be Viking Orbiter images, with a later transition to Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) when stereo coverage from that source is available for...
The Landsat 7 mission: terrestrial research and applications for the 21st century
Samuel N. Goward, Jeffrey G. Masek, Darrel L. Williams, James R. Irons, R.J. Thompson
2001, Remote Sensing of Environment (78) 3-12
The Landsat Earth observation approach introduced in 1972 created a new way of monitoring land cover and land use globally. The Landsat 7 mission, successfully launched on April 15, 1999, continues those observations and demonstrates significant progress in precise numerical radiometry, spectral differentiation, and seasonally repetitive monitoring. Substantial improvements in...
Applications of resistivity modeling in reservoir development: examples from Balder Field, Norwegian North Sea
Frederick L. Paillet, F.M. Haynes, O.M. Buretz
2001, Petrophysics (42) 17-18
The massive Paleocene oil sands of the Balder Field are overlain by several thinly bedded Eocene sand-prone packages of variable facies and reservoir quality. Although these sands have been penetrated by numerous exploration and development wells, uncertainty remains as to their extent, distribution, and ultimate effect on reservoir performance. The...
Relocation of Wyoming mine production blasts using calibration explosions
Carol A. Finn, Gordon D. Kraft, Matthew S. Sibol, Ronald L. Jones, Mark E. Pulaski
2001, Book chapter, Monitoring the comprehensive Nuclear-Test-Ban Treaty: Sourse location
An important requirement for a comprehensive seismic monitoring system is the capability to accurately locate small seismic events worldwide. Accurate event location can improve the probability of determining whether or not a small event, recorded predominantly by local and regional stations, is a nuclear explosion. For those portions of the...
National Hydrography Dataset (NHD)
Water Resources Division, U.S. Geological Survey
2001, Report
The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that make up the nation's surface water drainage system. NHD data was originally developed at 1:100,000 scale and exists at that scale for the whole country. High resolution NHD adds...
Field trials of line transect methods applied to estimation of desert tortoise abundance
David R. Anderson, Kenneth P. Burnham, Bruce C. Lubow, L. E. N. Thomas, Paul Stephen Corn, Philip A. Medica, R.W. Marlow
2001, Journal of Wildlife Management (65) 583-597
We examine the degree to which field observers can meet the assumptions underlying line transect sampling to monitor populations of desert tortoises (Gopherus agassizii). We present the results of 2 field trials using artificial tortoise models in 3 size classes. The trials were conducted on 2 occasions on an area...
Elevations and distances in the United States
U.S. Geological Survey
2001, Report
The information in this booklet was compiled to answer inquiries received by the U.S. Geological Survey from students, teachers, writers, editors, publishers of encyclopedias, almanacs, and other reference books, and people in many other fields of work. The elevations of features and distances between points in the United States were determined...
Ground-water flow and quality in the Atlantic City 800-foot sand, New Jersey
Steven D. McAuley, Julia L. Barringer, Gary N. Paulachok, Jeffrey S. Clark, Otto S. Zapecza
2001, New Jersey Geological Survey Report GSR 41
The regional, confined Atlantic City 800-foot sand is the principal source of water supply for coastal communities of southern New Jersey. In response to extensive use of the aquifer--nearly 21 million gallons per day in 1986--water levels have declined to about 100 feet below sea level near Atlantic City and...
Planetary geodesy and cartography at the USGS, Flagstaff: Moon, Mars, Venus, and beyond
Randolph L. Kirk, Mark R. Rosiek, Elpitha Howington-Kraus, Eric M. Eliason, Brent A. Archinal, Ella M. Lee
2001, Conference Paper, Proceedings of the XXth International Cartographic Conference
An important theme of our work is the synergistic use of a variety of geodetic, cartographic, and photogrammetric software packages. The USGS digital cartographic software system ISIS provides most of the processing capability needed for planimetric mapping tasks such as our revision of the global digital image mosaic of Mars...
Uncertainty and spatial linear models for ecological data
Jay M Ver Hoef, Noel Cressie, Robert N. Fisher, Ted J. Case
C. Hunsaker, M. Goodchild, Mark A. Friedl, Ted J. Case, editor(s)
2001, Book chapter, Spatial uncertainty in ecology
Models are not perfect; they do not fit the data exactly and they do not allow exact prediction. Given that models are imperfect, we need to assess the uncertainties in the fits of the models and their ability to predict new outcomes. The goals of building models for scientific problems...
Analysis of ambient conditions and simulation of hydrodynamics, constituent transport, and water-quality characteristics in Lake Maumelle, Arkansas, 1991-92
W. Reed Green
2001, Water-Resources Investigations Report 2001-4045
Lake Maumelle is the major drinking-water source for the Little Rock metropolitan area in central Arkansas. Urban and agricultural development has increased in the Lake Maumelle Basin and information is needed related to constituent transport and water quality response to changes in constituent loading or hydrologic regime. This report characterizes...
