Determination of methyl mercury by aqueous phase ethylation, followed by gas chromatographic separation with cold vapor atomic fluorescence detection
John F. De Wild, Mark L. Olsen, Shane D. Olund
2002, Open-File Report 2001-445
A recent national sampling of streams in the United States revealed low methyl mercury concentrations in surface waters. The resulting median and mean concentrations, calculated from 104 samples, were 0.06 nanograms per liter (ng/L) and 0.15 ng/L, respectively. This level of methyl mercury in surface water in the United States...
Investigation of an earthquake swarm near Trinidad, Colorado, August-October 2001
Mark E. Meremonte, John C. Lahr, Arthur D. Frankel, James W. Dewey, Anthony J. Crone, Dee E. Overturf, David L. Carver, W. Thomas Bice.
2002, Open-File Report 2002-73
A swarm of 12 widely felt earthquakes occurred between August 28 and September 21, 2001, in the area west of the town of Trinidad, Colorado. The earthquakes ranged in magnitude between 2.8 and 4.6, and the largest event occurred on September 5, eight days after the initial M 3.4...
Shear-wave velocity compilation for Northridge strong-motion recording sites
Roger D. Borcherdt, Thomas E. Fumal
2002, Open-File Report 2002-107
Borehole and other geotechnical information collected at the strong-motion recording sites of the Northridge earthquake of January 17, 1994 provide an important new basis for the characterization of local site conditions. These geotechnical data, when combined with analysis of strong-motion recordings, provide an empirical basis to evaluate site coefficients used...
Modified Mercalli Intensities (MMI) for some earthquakes in eastern North America (ENA) and empirical MMI site corrections for towns in ENA
W. H. Bakun, A. C. Johnston, M. G. Hopper
2002, Open-File Report 2002-109
Modified Mercalli Intensity (MMI) assignments for earthquakes in eastern North America (ENA) were used by Bakun et al. (submitted) to develop a model for eastern North America for estimating the location and moment magnitude M of earthquakes from MMI observations. MMI assignments for most of the earthquakes considered by Bakun...
Mine and mineral occurrences of Afghanistan
G. J. Orris, J. D. Bliss
2002, Open-File Report 2002-110
This inventory of more than 1000 mines and mineral occurrences in Afghanistan was compiled from published literature and the files of project members of the National Industrial Minerals project of the U.S. Geological Survey. The compiled data have been edited for consistency and most duplicates have been deleted. The data...
San Antonio, Texas audio-magnetotelluric data
H. A. Pierce
2002, Open-File Report 2002-118
No abstract available....
Field-trip guide to the southeastern foothills of the Santa Cruz Mountains in Santa Clara County, California
Philip W. Stoffer, Paula Messina
2002, Open-File Report 2002-121
This field trip is an introduction to the geology of the southeastern foothills of the Santa Cruz Mountains in southern Santa Clara County. Seven stops include four short hikes to access rock exposures and views of the foothills east of Loma Prieta Peak between Gilroy and San José. Field-trip destinations...
Geologic map of the Corona South 7.5' quadrangle, Riverside and Orange counties, California
C. H. Gray Jr., Douglas M. Morton, F. Harold Weber Jr., Kelly R. Bovard, Timothy O'Brien
2002, Open-File Report 2002-21
Open-File Report 01-021 contains a digital geologic map database of the Corona South 7.5’ quadrangle, Riverside County, California that includes: 1. ARC/INFO (Environmental Systems Research Institute, http://www.esri.com) version 7.2.1 coverages of the various elements of the geologic map. 2. A Postscript file to plot the geologic map on a topographic base, and...
Arsenic in rocks and stream sediments of the central Appalachian Basin, Kentucky
Michele L.W. Tuttle, Martin B. Goldhaber, Leslie F. Ruppert, James C. Hower
2002, Open-File Report 2002-28
Arsenic (As) enrichment in coal and stream sediments has been documented in the southern Appalachian basin (see Goldhaber and others, submitted) and is attributed to interaction of rocks and coal with metamorphic fluids generated during the Allegheny Orogeny (late Paleozoic). Similarly derived fluids are expected to affect the coal and...
Historical trends in U.S. mineral statistics for selected non-ferrous metals
David Z. Piper, Warren J. Nokleberg
2002, Open-File Report 2002-29
Production figures for selected nonferrous metals-aluminum (including bauxite and alumina), copper, lead, tin, titanium, and zinc-by the United States, as well as other statistics for these commodities, show strong volatility during 20th century. Major shifts were driven by the Great Depression and the two World Wars, but other major temporal...
Surface-water quality-assurance plan for the Wisconsin district of the U. S. Geological Survey, Water Resources Division
H.S. Garn
2002, Open-File Report 2002-30
This surface-water quality-assurance plan documents the standards, policies, and procedures used by the Wisconsin District of the U.S. Geological Survey, Water Resources Division, for activities related to the collection, processing, storage, analysis, management, and publication of surface-water data. The roles and responsibilities of District personnel in following these policies and...
Alaska resource data file: Nulato quadrangle
S.S. Dashevsky
2002, Open-File Report 2002-54
No abstract available....
Fate of carbon in Alaskan Landscapes Project: Database for soils from eddy covariance tower sites, Delta Junction, AK
Stagg King, Jennifer Harden, Kristen L. Manies, Jennie Munster, L. Douglas White
2002, Open-File Report 2002-62
Soils in Alaska, and in high latitude terrestrial ecosystems in general, contain significant amounts of organic carbon, most of which is believed to have accumulated since the start of the Holocene about 10 ky before present. High latitude soils are estimated to contain 30-40% of terrestrial soil carbon (Melillo et...
Alaska resource data file: Russian Mission quadrangle
T. L. Hudson, M.A. Millholland
2002, Open-File Report 2002-70
No abstract available....
A digital atlas of hydrocarbon accumulations within and adjacent to the National Petroleum Reserve-Alaska (NPRA)
Naresh Kumar, Kenneth J. Bird, Philip H. Nelson, John A. Grow, Kevin R. Evans
2002, Open-File Report 2002-71
The United States Geological Survey (USGS) has initiated a project to reassess the hydrocarbon potential of the NPRA. Although exploration for hydrocarbons in the NPRA was initiated in 1944, it has taken fifty years for the first commercial discovery to be made. That discovery, the Alpine field (projected recoverable reserves...
Petrographic and Geochemical Characterization of Ore-Bearing Intrusions of the Noril'sk type, Siberia; With Discussion of Their Origin, Including Additional Datasets and Core Logs
Gerald K. Czamanske (compiler)
2002, Open-File Report 2002-74
The Noril'sk I, Talnakh, and Kharaelakh intrusions of the Noril'sk district host one of the outstanding metal concentrations in the world; contained Cu-Ni resources are comparable to the deposits at Sudbury, Ontario and the platinum group element (PGE) resource is second only to that of the Bushveld Complex. Our opportunity...
Alaska resource data file: Norton Bay quadrangle
S.S. Dashevsky
2002, Open-File Report 2002-75
No abstract available....
Trace, minor and major element data for ground water near Fairbanks, Alaska, 1999-2000
S. H. Mueller, R.J. Goldfarb, G. L. Farmer, R. Sanzolone, M. Adams, P. M. Theodorakos, S.A. Richmond, R. Blaine McCleskey
2002, Open-File Report 2002-90
No abstract available....
Principal facts for 463 gravity stations in the vicinity of Tangle Lakes, east-central Alaska
Robert L. Morin, Jonathan M. G. Glen
2002, Open-File Report 2002-96
During the summer of 2001, a gravity survey was conducted in the vicinity of Tangle Lakes, east-central Alaska. Measurements of 87 gravity stations were made. The Tangle Lakes area is located about 25 km west of Paxson and north of the Denali Highway. The gravity survey is located on the...
Processing and interpretation of aeromagnetic data for the Santa Cruz Basin–Patagonia Mountains area, south-central Arizona
Jeffrey D. Phillips
2002, Open-File Report 2002-98
In 1997, the U.S. Geological Survey (USGS) contracted with Sial Geosciences Inc. for a detailed aeromagnetic survey of the Santa Cruz basin and Patagonia Mountains area of south-central Arizona. The contractor's Operational Report is included as an Appendix in this report. This section describes the data processing performed by the...
An interpretation of the 1996 aeromagnetic data for the Santa Cruz basin, Tumacacori Mountains, Santa Rita Mountains, and Patagonia Mountains, south-central Arizona
Mark E. Gettings
2002, Open-File Report 2002-99
High resolution aeromagnetic survey data flown at 250 m above the terrain and 250 m line spacing over the Santa Cruz Valley and the surrounding Tumacacori, Patagonia, and Santa Rita Mountains has been interpreted by correlation of the magnetic anomaly field and various derivative maps with geologic maps. Measurements of...
GRA prospectus; optimizing protected areas for conservation, September 2001
David Halsing, Richard Bernknopf
2002, Open-File Report 2002-67
User's guide to SEAWAT; a computer program for simulation of three-dimensional variable-density ground-water flow
Weixing Guo, C.D. Langevin
2002, Open-File Report 2001-434
This report has been superceded by TWRI Book 6, Chapter A7...
Geologic interpretation of aeromagnetic maps in the Santa Cruz basin: Patagonia Mountains area, south-central Arizona
V. L. Rystrom, C. A. Finn, Trude V. V. King
2002, Open-File Report 2002-100
High resolution aeromagnetic data for the Santa Cruz basin - Patagonia Mountains region of south-central Arizona (USGS, 2000) can be combined with geologic mapped regions to reconfirm known geologic features, extend known features, and suggest new possibilities. These include mapping of lava flows, mapping of igneous intrusions, mapping of faults,...
Alaska resource data file: Lime Hills quadrangle
T. L. Hudson, M.A. Millholland
2002, Open-File Report 2002-76
No abstract available....
