Deuterium in interstitial water from deep-sea cores
I. Friedman, K. Hardcastle
1988, Journal of Geophysical Research Solid Earth (93) 8249-8263
As part of the Joint Oceanographic Institutions Deep Earth Sampling project, the interstitial waters of cores from 69 holes were sampled for deuterium analysis. Sixteen of the cores penetrated sediments as old as Eocene, and several sampled Cretaceous sediments, which allowed us to examine changes in the deuterium content of...
Erosional furrows formed during the lateral blast at Mount St. Helens, May 18, 1980
S. W. Kieffer, B. Sturtevant
1988, Journal of Geophysical Research Solid Earth (93) 14793-14816
Nearly horizontal, quasi-periodic erosional features of 7-m average transverse wavelength and of order 100-m length occur in scattered locations from 3.5 to 9 km from the crater at Mount St. Helens under deposits of the lateral blast of May 18, 1980. We attribute the erosional features to scouring by longitudinal...
Effects of three-dimensional velocity structure on the seismicity of the 1984 Morgan Hill, California, aftershock sequence
A.J. Michael
1988, Bulletin of the Seismological Society of America (78) 1199-1221
A three-dimensional velocity model for the area surrounding the 24 April 1984 Morgan Hill earthquake has been developed by simultaneously inverting local earthquake and refraction arrival-time data. This velocity model corresponds well to the surface geology of the region, predominantly showing a low-velocity region associated with the sedimentary sequence to...
Teleseismic and near-field analysis of the Nahanni earthquakes in the Northwest Territories, Canada
G. L. Choy, J. Boatwright
1988, Bulletin of the Seismological Society of America (78) 1627-1652
The analysis of the Nahanni earthquakes of October 5, 1985 (MS 6.6), and December 23, 1985 (MS 6.9), will have important implications for the assessment of seismic hazards in intraplate environments. To maximize the information available to seismic engineers, broadband data recorded teleseismically are analyzed jointly with strong-motion data recorded...
Active high-resolution seismic tomography of compressional wave velocity and attenuation structure at Medicine Lake Volcano, northern California Cascade Range
J.R. Evans, J.J. Zucca
1988, Journal of Geophysical Research Solid Earth (93) 15016-15036
We determine compressional wave velocity and attenuation structures for the upper crust beneath Medicine Lake volcano in northeast California using a high-resolution active source seismic tomography method. Medicine Lake volcano is a basalt through rhyolite shield volcano of the Cascade Range, lying east of the range axis. The Pg wave from eight...
Petrographic characteristics of the Wyodak-Anderson coal bed (Paleocene), Powder River Basin, Wyoming, U.S.A.
Peter D. Warwick, Ronald W. Stanton
1988, Organic Geochemistry (12) 389-399
Six lithofacies of the thick ( > 30 m) Wyodak-Anderson subbituminous coal bed of the Fort Union Formation (Paleocene), Powder River Basin, Wyoming, can be delimited using megascopic and petrographic data. Previous lithofacies analysis of the rock types associated with the Wyodak-Anderson bed suggested that raised peat accumulated in restricted...
Diel variations in iron chemistry in an acidic stream in the Colorado Rocky Mountains, USA
D. McKnight, K.E. Bencala
1988, Arctic and Alpine Research (20) 492-500
In the Snake River, an acidic mountain stream in the Colorado Rocky Mountains, the concentration of dissolved iron is apparently unrelated to seasonal changes in hydrologic regime, which strongly influence the concentrations of most other dissolved constituents. Hourly sampling indicated that short-term fluctuations in iron chemistry occur, whereas the concentrations...
Predicting tidal currents in San Francisco Bay using a spectral model
Jon R. Burau, Ralph T. Cheng
1988, Conference Paper
This paper describes the formulation of a spectral (or frequency based) model which solves the linearized shallow water equations. To account for highly variable basin bathymetry, spectral solutions are obtained using the finite element method which allows the strategic placement of the computation points in the specific areas of interest...
Estimation of urban stormwater quality
Marshall E. Jennings, Gary D. Tasker
1988, Conference Paper
Two data-based methods for estimating urban stormwater quality have recently been made available - a planning level method developed by the U.S. Environmental Protection Agency (EPA), and a nationwide regression method developed by the U.S. Geological Survey. Each method uses urban stormwater water-quality constituent data collected for the Nationwide Urban...
Instrumentation for a dry-pond detention study
L. M. Pope, M.E. Jennings, K.G. Thibodeaux
1988, Conference Paper
A 12.3-acre, fully urbanized, residential land-use catchment was instrumented by the U. S. Geological Survey in Topeka, Kansas. Hydraulic instrumentation for flow measurement includes two types of flumes, a pipe-insert flume and a culvert-inlet (manhole) flume. Samples of rainfall and runoff for water-quality analyses were collected by automatic, 3-liter, 24-sample...
Estimation of descriptive statistics for multiply censored water quality data
Dennis R. Helsel, Timothy A. Cohn
1988, Water Resources Research (24) 1997-2004
This paper extends the work of Gilliom and Helsel (1986) on procedures for estimating descriptive statistics of water quality data that contain “less than” observations. Previously, procedures were evaluated when only one detection limit was present. Here we investigate the performance of estimators for data that have multiple detection limits....
Stochastic system identification in structural dynamics
Erdal Safak
1988, Conference Paper
Recently, new identification methods have been developed by using the concept of optimal-recursive filtering and stochastic approximation. These methods, known as stochastic identification, are based on the statistical properties of the signal and noise, and do not require the assumptions of current methods. The criterion for stochastic system identification is...
The Land Analysis System (LAS) for multispectral image processing
S. W. Wharton, Y. C. Lu, Bruce K. Quirk, Lyndon R. Oleson, J. A. Newcomer, Frederick M. Irani
1988, IEEE Transactions on Geoscience and Remote Sensing (26) 693-697
The Land Analysis System (LAS) is an interactive software system available in the public domain for the analysis, display, and management of multispectral and other digital image data. LAS provides over 240 applications functions and utilities, a flexible user interface, complete online and hard-copy documentation, extensive image-data file management, reformatting,...
Intermediate-scale vegetation mapping of Innoko National Wildlife Refuge, Alaska using Landsat MSS digital data
Stephen S. Talbot, Carl J. Markon
1988, Photogrammetric Engineering and Remote Sensing (54) 377-383
A Landsat-derived vegetation map was prepared for lnnoko National Wildlife Refuge. The refuge lies within the northern boreal subzone of northwestern central Alaska. Six major vegetation classes and 21 subclasses were recognized: forest (closed needleleaf, open needleleaf, needleleaf woodland, mixed, and broadleaf); broadleaf scrub (lowland, upland burn regeneration, subalpine); dwarf...
An integrated approach for automated cover-type mapping of large inaccessible areas in Alaska
Michael D. Fleming
1988, Photogrammetric Engineering and Remote Sensing (54) 357-362
The lack of any detailed cover type maps in the state necessitated that a rapid and accurate approach to be employed to develop maps for 329 million acres of Alaska within a seven-year period. This goal has been addressed by using an integrated approach to computer-aided analysis which combines efficient...
Extracting topographic structure from digital elevation data for geographic information-system analysis
Susan K. Jenson, Julia O. Domingue
1988, Photogrammetric Engineering and Remote Sensing (54) 1593-1600
Software tools have been developed at the U.S. Geological Survey's EROS Data Center to extract topographic structure and to delineate watersheds and overland flow paths from digital elevation models. The tools are specialpurpose FORTRAN programs interfaced with general-purpose raster and vector spatial analysis and relational data base management packages. The first...
NOAA-10 AVHRR thermal-infrared image of the Colorado Rocky Mountains
Kevin P. Gallo, Bruce K. Quirk, Joy J. Hood
1988, Photogrammetric Engineering and Remote Sensing (54) 777
This month we demonstrate an example of the use of thermal infrared imagery to produce a relatively sharp surrogate shaded-relief image. The image shows one aspect of the drama and usefulness of calibrated thermal imagery that (because of compatible projection and pixel size) can be easily combined with other spectral...
Strontium-isotope stratigraphy of Enewetak Atoll
K.R. Ludwig, Robert B. Halley, Kathleen R. Simmons, Zell E. Peterman
1988, Geology (16) 173-177
87Sr/86Sr ratios determined for samples from a 350 m core of Neogene lagoonal, shallow-water limestones from Enewetak Atoll display a remarkably informative trend. Like the recently published data for Deep Sea Drilling Project (DSDP) carbonates, 87Sr/86Sr at Enewetak increases monotonically but not smoothly from...
Water resources data Maryland and Delaware, water year 1987
R.W. James, R.J. Simmons, B.F. Strain
1987, Water Data Report MD-DE-87-1
No abstract available....
Base of moderately saline ground water in the Uinta Basin, Utah, with an introductory section describing the methods used in determining its position
Lewis Howells, M.S. Longson, Gilbert L. Hunt
1987, Technical Publication 92
The base of the moderately saline water (water that contains from 3,000 to 10,000 milligrams per liter of dissolved solids) was mapped by using available water-quality data and by determining formation-water resistivities from geophysical well logs based on the resistivity-porosity, spontaneous potential, and resistivity-ratio methods. The contour map developed from...
Morgan Hill, California Earthquake, April 1984
Henry Spall, editor(s)
1987, Earthquake Information Bulletin (USGS) (17) 173-176
The Morgan Hill earthquake, a moderate-size (Mg=6.1, ML =6.2, M=6.2) event, was felt throughout central California on April 24, 1984. The epicenter of the earthquake was located near Halls Valley southwest of Mount Hamilton, and the event is presumed to have occurred on the Calaveras fault. Damage, however, was...
Trends in spawning populations of Pacific anadromous salmonids
G.W. Konkel, J.D. McIntyre
1987, Fish and Wildlife Technical Report 9
Annual escapement records for 1968-1984 for five species of Pacific salmon-chinook (Oncorhynchus tshawytscha), coho (O. kisutch), sockeye (O. nerka), pink (O. gorbuscha), and chum (O. keta)—and steelhead (Salmo gairdneri) were obtained from published and unpublished sources and organized in a computer database. More than 25,500 escapement records were obtained for...
Genetic variation in chinook, Oncorhynchus tshawytscha, and coho, O. Kisutch
R.R. Reisenbichler, S.R. Phelps
1987, Fishery Bulletin (85) 681-701
We used starch-gel electrophoresis to genetically characterize the populations of chinook salmon, Oncorhynchus tshawytscha, and coho salmon, O. kisutch, in the major drainages of the north coast of Washington (the Quillayute, Uoh, Queets, and Quinault Rivers). Of 55 loci examined for electrophoretically detectable variation. 6 were polymorphic (frequency of the...
Tetlin National Wildlife Refuge land cover mapping project users guide
Carl J. Markon
1987, Report
Title III of the Alaska National Interest Lands Conservation Act of 1980 (ANILCA, 1980) established the Tetlin National Wildlife Refuge (TNWR). Section 304 of the Act requires the Secretary of Interior to "prepare, and from time to time revise, a comprehensive conservation plan" for the refuge. Before developing a plan...
Analysis of water-level fluctuations in Wisconsin wells
G. L. Patterson, A. Zaporozec
1987, Wisconsin Geological & Natural History Survey Information Circular 63
More than 60 percent of the residents of Wisconsin use ground water as their primary water source. Water supplies presently are abundant, but ground-water levels continually fluctuate in response to natural factors and human-related stresses. A better understanding of the magnitude, duration, and frequency of past fluctuations, and the factors...
