Carbon cycling in boreal wetlands: A comparison of three approaches
Susan E. Trumbore, Jill Bubier, Jennifer W. Harden, Patrick M. Crill
1999, Journal of Geophysical Research - Atmospheres (104) 27673-27682
Three independent methods were used to measure net ecosystem production (NEP) in four wetlands near Thompson, Manitoba, Canada. The first method calculated NEP by subtracting heterotrophic respiration from net primary productivity, using both measurements and estimates derived from the literature. The second method used radiocarbon data from cores to derive...
Winter ecology of the endangered golden-cheeked warbler
John H. Rappole, David I. King, Wylie C. Barrow Jr.
1999, The Condor (101) 762-770
We studied the ecology of the Golden-cheeked Warbler (Dendroica chrysoparia) during three winter seasons, 1995-1998, in Honduras, Guatemala, and Mexico. Individuals of this species occurred almost exclusively as members of mixed-species flocks, occupying sites with greater densities of encino oak and ground cover and fewer pines than random sites. Most...
Modeling the effects of land use and climate change on riverine smallmouth bass
James T. Peterson, Thomas J. Kwak
1999, Ecological Applications (9) 1391-1404
Anthropogenic changes in temperature and stream flow, associated with watershed land use and climate change, are critical influences on the distribution and abundance of riverine fishes. To project the effects of changing land use and climate, we modeled a smallmouth bass (Micropterus dolomieu) population in a midwestern USA, large river–floodplain...
Contaminants and Marine Geology in the New York Bight: Modern Sediment Dynamics and a Legacy for the Future
Ellen L. Mecray, Marilyn R. Buchholtz ten Brink, Bradford Butman
1999, Fact Sheet 114-99
Hydrogeology and analysis of aquifer characteristics in west-central Pinellas County, Florida
J. C. Broska, H.L. Barnette
1999, Open-File Report 99-185
The U.S. Geological Survey, in cooperation with Pinellas County, Florida, conducted an investigation to describe the hydrogeology and analyze the aquifer characteristics in west-central Pinellas County. A production test well and four monitor wells were constructed in Pinellas County at Walsingham Park during 1996-97. Water-quality sampling, static and dynamic borehole...
Thickness of Cenozoic Deposits of Yucca Flat Inferred from Gravity Data, Nevada Test Site, Nevada
G. A. Phelps, V.E. Langenheim, R.C. Jachens
1999, Open-File Report 99-310
The basin-basement contact for Yucca Flat was modeled using isostatic gravity data, a linear density-depth function for the basin deposits, and drill-hole constraints to produce a digital database of both the depth to basement and the gravitational anomaly associated with the basement rocks. The model predicts a depth of roughly...
An assessment of seismic monitoring in the United States; requirement for an Advanced National Seismic System
Water Resources Division, U.S. Geological Survey
1999, Circular 1188
This report assesses the status, needs, and associated costs of seismic monitoring in the United States. It sets down the requirement for an effective, national seismic monitoring strategy and an advanced system linking national, regional, and urban monitoring networks. Modernized seismic monitoring can provide alerts of imminent strong earthquake shaking;...
Subduction zone and crustal dynamics of western Washington; a tectonic model for earthquake hazards evaluation
Dal Stanley, Antonio H. Villasenor, Harley Benz
1999, Open-File Report 99-311
The Cascadia subduction zone is extremely complex in the western Washington region, involving local deformation of the subducting Juan de Fuca plate and complicated block structures in the crust. It has been postulated that the Cascadia subduction zone could be the source for a large thrust earthquake, possibly as large...
Publications of the Western Geologic Mapping Team 1997-1998
Paul Stone, C.L. Powell II
1999, Open-File Report 99-302
The Western Geologic Mapping Team (WGMT) of the U.S. Geological Survey, Geologic Division (USGS, GD), conducts geologic mapping and related topical earth-science studies in the western United States. This work is focused on areas where modern geologic maps and associated earth-science data are needed to address key societal and environmental...
Estimated hydraulic properties for the surficial- and bedrock-aquifer system, Meddybemps, Maine
Forest P. Lyford, Stephen P. Garabedian, Bruce P. Hansen
1999, Open-File Report 99-199
Analytical and numerical-modeling methods were used to estimate hydraulic properties of the aquifer system underlying the Eastern Surplus Company Superfund Site in Meddybemps, Maine. Estimates of hydraulic properties are needed to evaluate pathways for contaminants in ground water and to support evaluation and selection of remediation measures for contaminated ground...
Geological and geophysical setting of the gold-silver vein systems of Unga Island, southwestern Alaska
James R. Riehle, editor(s)
1999, Open-File Report 99-136
The topic of this CD-ROM is the geologic framework of gold-silver vein deposits on Unga Island, in the Shumagin Islands, southwestern Alaska. The core of the publication is a new geologic map at a scale of 1:63,360 and aeromagnetic and electromagnetic survey data acquired by industry over the area of...
Gravity and magnetic study of the Pahute Mesa and Oasis Valley region, Nye County, Nevada
Edward A. Mankinen, Thomas G. Hildenbrand, Gary L. Dixon, Edwin H. McKee, Christopher J. Fridrich, Randell J. Laczniak
1999, Open-File Report 99-303
Regional gravity and aeromagnetic maps reveal the existence of deep basins underlying much of the southwestern Nevada volcanic field, approximately 150 km northwest of Las Vegas. These maps also indicate the presence of prominent features (geophysical lineaments) within and beneath the basin fill. Detailed gravity surveys were conducted in order...
Susceptibility of ground water to surface and shallow sources of contamination, Orange County, North Carolina
Silvia Terziotti, J. L. Eimers
1999, Open-File Report 99-179
In 1998, the relative susceptibility of ground water in Orange County, North Carolina,to contamination from surface and shallow sources was evaluated. A geographic information system was used to build three county-wide layers--soil permeability, land use/land cover, and land-surface slope. The harmonic mean permeability of soil layers was used to estimate...
Polychlorinated biphenyls and 2,3,7,8-tetrachlorodibenzo-p-dioxin equivalents in tree swallows from the upper Hudson River, New York State, USA
Anne L. Secord, John P. McCarty, Kathy R. Echols, John C. Meadows, Robert W. Gale, Donald E. Tillitt
1999, Environmental Toxicology and Chemistry (18) 2519-2525
The upper Hudson River of New York State, USA, is contaminated with polychlorinated biphenyls (PCBs) as a result of industrial discharges throughout the latter half of this century. In 1994 and 1995, we monitored the transfer of PCBs from aquatic sediments to a terrestrial wildlife community using the tree swallow...
Nomenclature of the micas
M. Rieder, G Cavazzini, Y.S. D’yakonov, V.A. Frank-Kamenetskii, G Gottardi, S. Guggenheim, P.V. Koval, G Muller, A.M.R. Neiva, E.W. Radoslovich, J.-L. Robert, F.P Sassi, H. Takeda, David R. Wones
1999, Mineralogical Magazine (63) 267-279
End-members and species defined with permissible ranges of composition are presented for the true micas, the brittle micas, and the interlayer-deficient micas. The determination of the crystallochemical formula for different available chemical data is outlined, and a system of modifiers and suffixes is given to allow the expression of unusual...
7Be as a tracer of flood sedimentation on the northern California continental margin
C. K. Sommerfield, C. A. Nittrouer, C. R. Alexander
1999, Continental Shelf Research (19) 335-361
Sediment inventories of the cosmogenic radionuclide 7Be (t1/2=53 d) were measured on the Eel River shelf and slope (northern California continental margin) to investigate sedimentation processes associated with coastal river flooding. Seabed coring shortly after major riverflow events in 1995 and 1997 documented a shelf-wide flood deposit, and subsequent radionuclide...
Effects of sample size and sampling frequency on studies of brown bear home ranges and habitat use
Steve M. Arthur, Charles C. Schwartz
1999, Ursus (11) 139-148
We equipped 9 brown bears (Ursus arctos) on the Kenai Peninsula, Alaska, with collars containing both conventional very-high-frequency (VHF) transmitters and global positioning system (GPS) receivers programmed to determine an animal's position at 5.75-hr intervals. We calculated minimum convex polygon (MCP) and fixed and adaptive kernel home ranges for randomly-selected...
Groundwater geochemistry in the Seminole Well Field, Cedar Rapids, Iowa
Robert A. Boyd
1999, Journal of the American Water Resources Association (35) 1257-1268
The City of Cedar Rapids obtains its municipal water supply from four well fields in an alluvial aquifer along the Cedar River in east-central Iowa. Since 1992, the City and the U.S. Geological Survey have cooperatively studied the groundwater-flow system and water chemistry near the well fields. The geochemistry in...
The Washington and Oregon mid-shelf silt deposit and its relation to the late Holocene Columbia River sediment budget
Stephen C. Wolf, Hans Nelson, Michael R. Hamer, Gita Dunhill, R. Lawrence Phillips
1999, Open-File Report 99-173
The purpose of this report is to compile and analyze existing data which lend support to the development of a sediment budget for the Columbia River, coastal, and offshore regions of southwest Washington. This will contribute to the construction of a sediment budget model which will reflect sediment sources, depocenters,...
Methods of generating synthetic acoustic logs from resistivity logs for gas-hydrate-bearing sediments
Myung W. Lee
1999, Bulletin 2170
Methods of predicting acoustic logs from resistivity logs for hydrate-bearing sediments are presented. Modified time average equations derived from the weighted equation provide a means of relating the velocity of the sediment to the resistivity of the sediment. These methods can be used to transform resistivity logs into acoustic logs with or without using the...
Preliminary report on the International Energy Agency mode of occurrence inter-laboratory comparison; Phase I, USGS results
Curtis A. Palmer, Allan Kolker, Jason C. Willett, Stanley J. Mroczkowski, Robert B. Finkelman, K.C. Taylor, F.T. Dulong, J. H. Bullock Jr.
1999, Open-File Report 99-160
No abstract available....
Atlas of relations between climatic parameters and distributions of important trees and shrubs in North America
Robert S. Thompson, Katherine H. Anderson, Patrick J. Bartlein
1999, Professional Paper 1650-A,B
This atlas explores the continental-scale relations between the geographic ranges of woody plant species and climate in North America. A 25-km equal-area grid of modern climatic and bioclimatic parameters was constructed from instrumental weather records. The geographic distributions of selected tree and shrub species were digitized, and the presence or...
Last interglacial sea-surface temperature estimates from the California margin; improvements to the modern analog technique
Harry J. Dowsett, Richard Z. Poore
1999, Bulletin 2171
Total faunal analyses of planktic foraminifer assemblages are used to derive sea surface temperature estimates for the last interglacial from Ocean Drilling Program Sites 1018 and 1020 off northern and central California. Foraminifer assemblage data were transformed to sea-surface temperature (SST) estimates by using the modern analog technique (MAT). In...
Simulation of the effects of operating lakes Mendota, Monona, and Waubesa, south-central Wisconsin, as multipurpose reservoirs to maintain dry-weather flow
W.R. Krug
1999, Open-File Report 99-67
A digital reservoir routing model was used to simulate the operation of Lakes Mendota, Monona, and Waubesa, south-central Wisconsin for various levels of minimum release. Twenty-five years of record (1970?94) were used in model simulation. The amount of water available to maintain streamflow and lake levels during dry periods has...
Modified Mercalli intensities for some California north-coast earthquakes
W. H. Bakun
1999, Open-File Report 99-171
Modified Mercalli Intensity (MMI) data are used by Bakun (in preparation) to estimate the location and moment magnitude M of California north-coast earthquakes from MMI observations only. The MMI data and site corrections used by Bakun (in preparation) are listed in this Open-file Report. This report is also accessible at...
