Earthquakes; July-August, 1978
W. J. Person
1979, Earthquake Information Bulletin (USGS) (11) 26-29
Earthquake activity during this period was about normal. Deaths from earthquakes were reported from Greece and Guatemala. Three major earthquakes (magnitude 7.0-7.9) occurred in Taiwan, Chile, and Costa Rica. In the United States, the most significant earthquake was a magnitude 5.6 on August 13 in southern California. ...
Low-flow characteristics of streams in the Trempealeau-Black River basin, Wisconsin
B. K. Holmstrom
1979, Water-Resources Investigations Report 79-9
Lov-flov characteristics of streams in the Trempealeau-Black River "basin are presented. Included are estimates of low-flow frequency and flow duration at 9 gaging stations, and low-flow frequency characteristics at 20 low-flow partial-record stations and 119 miscellaneous sites. Ten equations are provided to estimate low-flow characteristics at ungaged sites and at sites...
Modification of a commercial micrometer hanging mercury drop electrode
J. E. Bonelli, H. E. Taylor, R. K Skogerboe
1979, Analytical Chemistry (51) 2412-2413
U.S. Geological Survey...
Recent developments in uranium exploration using the U.S. Geological Survey's mobile helium detector
G.M. Reimer, E.H. Denton, I. Friedman, J. K. Otton
1979, Journal of Geochemical Exploration (11) 1-12
A mobile mass spectrometer to measure He concentrations has been developed by the U.S. Geological Survey. This instrument has been tested in areas of known uranium deposits, and He anomalies have been found in both soil gas and water. A gas sample is collected in a hypodermic syringe, injected into...
The 1976 Tangshan earthquake
Wang Fang
1979, Earthquake Information Bulletin (USGS) (11) 106-109
The Tangshan earthquake of 1976 was one of the largest earthquakes in recent years. It occurred on July 28 at 3:42 a.m, Beijing (Peking) local time, and had magnitude 7.8, focal depth of 15 kilometers, and an epicentral intensity of XI on the New Chinese Seismic Intensity Scale; it caused...
The Yellow Dog peridotite and a possible buried igneous complex of lower Keweenawan age in the northern peninsula of Michigan
John S. Klasner, David W. Snider, W.F. Cannon, John F. Slack
1979, Michigan Geological Survey Report of Investigation 24
Partly serpentinized peridotite of early Keweenawan age crops out in two places along a 20-kilometer-long zone of positive aeromagnetic anomalies in northern Marquette County, Michigan. Most of the area is mantled by Pleistocene drift with few bedrock exposures.Petrographic and electron microprobe studies show that the peridotite was originally a plagioclase...
Measured sections of Ordovician strata in east-central Kentucky
W. L. Peterson, W. C. Swadley
G. W. Weir, editor(s)
1979, Open-File Report 79-1664
No abstract available....
Geohydrologic impacts of coal development in the Narragansett Basin, Massachusetts and Rhode Island
Michael H. Frimpter, Anthony Maevsky
1979, Water Supply Paper 2062
The hydrologic impacts of possible coal mining in the 900-square-mile Carboniferous Narragansett Basin in southeastern New England are described. Geophysical tests and hydrologic observations were made in thirteen 3-inch-diameter test holes which were 330 to 1,500 feet deep. Fractures and lithology, including graphite and coal, were identified and located from...
Influences of selected environmental factors on the activity of a prospective fish toxicant, 2-(digeranyl-amino)-ethanol, in laboratory tests
C.A. Launer, T.D. Bills
1979, Investigations in Fish Control 88
Abstract not submitted to date...
Classification of wetlands and deepwater habitats of the United States
L.M. Cowardin, V. Carter, F.C. Golet, E.T. LaRoe
1979, FWS/OBS 79/31
This classification, to be used in a new inventory of wetlands and deepwater habitats of the United States, is intended to describe ecological taxa, arrange them in a system useful to resource managers, furnish units for mapping, and provide uniformity of concepts and terms. Wetlands are defined by plants (hydrophytes),...
Population differentiation along a flood frequency gradient: Physiological adaptations to flooding in Nyssa sylvatica
Jon E. Keeley
1979, Ecological Monographs (49) 89-108
Throughout the southeastern United States the hardwood Nyssa sylvatica (sensu lato) is distributed along a soil moisture gradient from upland sites, which are never flooded, to floodplains, which are periodically flooded and drained to permanently flooded swamps. Population differentiation with respect to flood tolerance and related physiological attributes was investigated...
Quantitative variation and the ecological role of vulpinic acid and atranorin in thallus of Letharia vulpina
Nathan L. Stephenson, Philip W. Rundel
1979, Biochemical Systematics and Ecology (7) 263-267
High pressure liquid chromatography was used to determine concentrations of vulpinic acid and atranorin in the thaullus of Letharia vulpina. Vulpinic acid concentration is lowest in the old basal branches of the thallus and increases toward the young branch tips, whereas the reverse is true for atranorin. The suggested role of...
Volcanic eruption plumes on Io
R.G. Strom, R.J. Terrile, H. Masursky, C. Hansen
1979, Nature (280) 733-736
An umbrella-shaped plume detected above Io confirms that Io is volcanically active. Preliminary analyses of eight such eruptive plumes are presented. ?? 1979 Nature Publishing Group....
The genus Platychara from the Western Hemisphere
R.E. Peck, R. M. Forester
1979, Review of Palaeobotany and Palynology (28) 223-236
The systematics of four species belonging to the genus Platychara (Charophyta) from the Western Hemisphere is discussed. Three of the species, as defined herein, occur in Cretaceous and Paleocene rocks from Mexico through South America. The type species, P. compressa (Peck and Reker) Grambast, also of Cretaceous and Paleocene age,...
Geochemical and hydrologic considerations and the use of enthalpy-chloride diagrams in the prediction of underground conditions in hot-spring systems
R.O. Fournier
1979, Journal of Volcanology and Geothermal Research (5) 1-16
Thermal water ascending in a hot-spring system may cool by conduction of heat to the surrounding rock, by boiling, by mixing with cooler water, or by a combination of these processes. Complete or partial chemical reequilibration may occur as a result of this cooling. In spite of these complexities, in...
Lunar magnetic anomalies detected by the Apollo substatellite magnetometers
L. L. Hood, P.J. Coleman Jr., C.T. Russell, D.E. Wilhelms
1979, Physics of the Earth and Planetary Interiors (20) 291-311
Properties of lunar crustal magnetization thus far deduced from Apollo subsatellite magnetometer data are reviewed using two of the most accurate presently available magnetic anomaly maps - one covering a portion of the lunar near side and the other a part of the far side. The largest single anomaly found...
An algol program for dissimilarity analysis: a divisive-omnithetic clustering technique
J.C. Tipper
1979, Computers & Geosciences (5) 1-13
Clustering techniques are used properly to generate hypotheses about patterns in data. Of the hierarchical techniques, those which are divisive and omnithetic possess many theoretically optimal properties. One such method, dissimilarity analysis, is implemented here in ALGOL 60, and determined to be competitive computationally with most other methods. ?? 1979....
Photogrammetric portrayal of Mars topography
Sherman S.C. Wu
1979, Journal of Geophysical Research Solid Earth (84) 7955-7960
Special photogrammetric techniques have been developed to portray Mars topography, using Mariner and Viking imaging and nonimaging topographic information and earth-based radar data. Topography is represented by the compilation of maps at three scales: global, intermediate, and very large scale. The global map is a synthesis of topographic information obtained...
Probability weighted moments compared with some traditional techniques in estimating Gumbel Parameters and quantiles
J. Maciunas Landwehr, N.C. Matalas, J.R. Wallis
1979, Water Resources Research (15) 1055-1064
Estimates of the parameters and quantiles of the Gumbel distribution by the methods of probability weighted moments, (conventional) moments, and maximum likelihood were compared. Results were derived from Monte Carlo experiments by using both independent and serially correlated Gumbel numbers. The method of probability weighted moments was seen...
Estimating nest success: The Mayfield method and an alternative
Douglas H. Johnson
1979, The Auk (96) 651-661
Mayfield's method for calculating the success of a group of nests is examined in detail. The standard error of his estimator is developed. Mayfield's assumption that destroyed nests are at risk until the midpoint of the interval between visits leads to bias if nests are visited infrequently. A remedy is...
Submarine thermal springs on the Galapagos Rift
J.B. Corliss, J. Dymond, L.I. Gordon, J.M. Edmond, R. P. Von Herzen, Richard D. Ballard, K. Green, D. Williams, A. Bainbridge, K. Crane, T. H. Van Andel
1979, Science (203) 1073-1083
The submarine hydrothermal activity on and near the Galápagos Rift has been explored with the aid of the deep submersible Alvin. Analyses of water samples from hydrothermal vents reveal that hydrothermal activity provides significant or dominant sources and sinks for several components of seawater; studies of conductive and convective heat transfer...
Geochemical evidence of drawdown in the Cerro Prieto geothermal field
A.H. Truesdell, M.A. Manon, S.M.E. Jimenez, A.A. Sanchez, L.J.J. Fausto
1979, Geothermics (8) 257-265
Some wells of the Cerro Prieto geothermal field have undergone changes in the chemistry of fluids produced which reflect reservoir processes. Pressure decreases due to production in the southeastern part of the field have produced both drawdown of lower chloride fluids from an overlying aquifer and boiling in the aquifer...
Removal of contaminants from landfill leachates by filtration through glauconitic greensands
N. Spoljaric, W.A. Crawford
1979, Environmental Geology (2) 359-363
Passing landfill leachate through glauconitic greensand filters reduces the heavy metal cation content, lessens the unpleasant odor, and diminishes the murkiness of the leachate. The capability of the greensand to trap metal cations is increased by prolonging the contact time between the leachate and the greensand. Flushing the charged greensand...
The determination of silver in silicate rocks by electrothermal atomic absorption spectrometry
P. J. Aruscavage, E.Y. Campbell
1979, Analytica Chimica Acta (109) 171-175
Silver is extracted from a 20% tartaric acid solution by using butyl acetate and diphenylthiourea, and the organic layer is analyzed directly by the graphite-furnace technique. The precisions is ca. 8% as estimated from multiple analysis of 13 standard rocks; there are no systematic errors. The detection limit is 2.4...
Pattern drilling exploration: Optimum pattern types and hole spacings when searching for elliptical shaped targets
L.J. Drew
1979, Journal of the International Association for Mathematical Geology (11) 223-254
In this study the selection of the optimum type of drilling pattern to be used when exploring for elliptical shaped targets is examined. The rhombic pattern is optimal when the targets are known to have a preferred orientation. Situations can also be found where a rectangular pattern is as efficient...
