Regional and local networks of horizontal control, Cerro Prieto geothermal area
B.L. Massey
1979, Geothermics (8) 275-281
The Cerro Prieto geothermal area in the Mexicali Valley 30 km southeast of Mexicali, Baja California, is probably deforming due to (1) the extraction of large volumes of steam and hot water, and (2) active tectonism. Two networks of precise horizontal control were established in Mexicali Valley by the U.S....
Surface faults in the gulf coastal plain between Victoria and Beaumont, Texas
Earl R. Verbeek
1979, Tectonophysics (52) 373-375
Displacement of the land surface by faulting is widespread in the Houston-Galveston region, an area which has undergone moderate to severe land subsidence associated with fluid withdrawal (principally water, and to a lesser extent, oil and gas). A causative link between subsidence and fluid extraction has been convincingly reported in...
Computers at the Albuquerque Seismological Laboratory
J. Hoffman
1979, Earthquake Information Bulletin (USGS) (11) 138-140
The Worldwide Standardized Seismograph Network (WWSSN) is managed by the U.S Geological Survey in Albuquerque, N. Mex. It consists of a global network of seismographs housed in seismic observatories throughout the world. An important recent addition to this network are the Seismic Research Observatories (SRO) which combine a borehole seismometer...
Earthquakes; March-April, 1979
W. J. Person
1979, Earthquake Information Bulletin (USGS) (11) 183-186
This was a moderately active period, seismically speaking. Three major earthquakes having magnitudes (M) ranging from 7.0 to 7.9 to only one major quake during the first 2 months of the year. Major earthquakes struck in Mexico, Indonesia, and Yugoslavia. The Yugoslavian earthquake caused considerable damage and loss of life. In...
On Chinese earthquake history - An attempt to model an incomplete data set by point process analysis
W.H.K. Lee, D.R. Brillinger
1979, Pure and Applied Geophysics PAGEOPH (117) 1229-1257
Since the 1950s, the Academia Sinica in Peking, People's Republic of China, has carried out extensive research on the Chinese earthquake history. With a historical record dating back some 3000 years, a wealth of information on Chinese earthquakes exists. Despite this monumental undertaking by the Academia Sinica, much work is...
Dynamics of volcanic plumes on Io
A. F. Cook, E.M. Shoemaker, B.A. Smith
1979, Nature (280) 743-746
Ballistic and aerodynamic models are proposed to explain the volcanic plumes on Io, with particular reference to Plumes 1 and 3 which seem to have the same origin....
Massive deep-sea sulphide ore deposits discovered on the East Pacific Rise
Jean Francheteau, H.D. Needham, P. Choukroune, Tierre Juteau, M. Seguret, Richard D. Ballard, P.J. Fox, William Normark, A. Carranza, D. Cordoba, J. Guerrero, C. Rangin, H. Bougault, P. Cambon, R. Hekinian
1979, Nature (277) 523-528
Massive ore-grade zinc, copper and iron sulphide deposits have been found at the axis of the East Pacific Rise. Although their presence on the deep ocean-floor had been predicted there was no supporting observational evidence. The East Pacific Rise deposits represent a modern analogue of Cyprus-type sulphide ores associated with...
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...
D/H ratios in speleothem fluid inclusions: A guide to variations in the isotopic composition of meteoric precipitation?
R.S. Harmon, H.P. Schwarcz, J. R. O’Neil
1979, Earth and Planetary Science Letters (42) 254-266
D/H ratios of fluid inclusion waters extracted from230Th/234U-dated speleothems that were originally deposited under conditions of isotopic equilibrium should provide a direct estimate of the hydrogen isotopic composition of ancient meteoric waters. We present here D/H ratios for 47 fluid inclusion...
Beach-cusp formation
A. H. Sallenger Jr.
1979, Marine Geology (29) 23-37
Field experiments on beach-cusp formation were undertaken to document how the cuspate form develops and to test the edge-wave hypothesis on the uniform spacing of cusps. These involved observations of cusps forming from an initially plane foreshore. The cuspate form was observed to be a product of swash modification of an...
Origin of reverse-graded bedding in air-fall pumice, Coso Range, California
W. A. Duffield, C. R. Bacon, G.R. Roquemore
1979, Journal of Volcanology and Geothermal Research (5) 35-48
The origin of reverse grading in air-fall pyroclastic deposits has been ascribed to: (1) changing conditions at an erupting vent; (2) deposition in water; or (3) rolling of large clasts over smaller clasts on the surface of a steep slope. Structural features in a deposit of air-fall pumice lapilli in...
Arsenic and fluoride in the upper madison river system: Firehole and gibbon rivers and their tributaries, yellowstone national park, wyoming, and southeast montana
J. M. Thompson
1979, Environmental Geology (3) 13-21
Chemical analyses of 21 water samples from the Firehole and Gibbon Rivers, which combine to form the Madison River, gave arsenic and fluoride values above the Environmental Protection Agency Interim Primary Drinking Water maximum contaminant levels (0.05 mg/l arsenic and 2.0 mg/l fluoride). On 18 October, 1975, during a period...
A review of numerical simulation of hydrothermal systems
J.W. Mercer, C.R. Faust
1979, Hydrological Sciences Bulletin (24) 335-344
Many advances in simulating single and two-phase fluid flow and heat transport in porous media have recently been made in conjunction with geothermal energy research. These numerical models reproduce system thermal and pressure behaviour and can be used for heat-transport problems other than those associated with geothermal energy development, such...
Venus: Preliminary topographic and surface imaging results from the Pioneer Orbiter
G.H. Pettengill, P.G. Ford, W.E. Brown, W.M. Kaula, H. Masursky, E. Eliason, G.E. McGill
1979, Science (205) 90-93
Three large Venus surface features, identified previously in images obtained from Earth-based radar observations, are shown by the Pioneer Venus radar mapper to be elevated 5 to 10 kilometers above the surrounding terrain. Two of these features, one bright and the other dark, lie adjacent to each...
Digital model of the Bayou Bartholomew alluvial aquifer stream system, Arkansas
J.E. Reed, Matthew E. Broom
1979, Open-File Report 79-685
A digital model of the Bayou Bartholomew aquifer-stream system in Arkansas was calibrated for the purpose of predicting hydrologic responses to stresses of water development. The simulated-time span for model calibration was from 1953 to 1970, during which time the system was stressed largely by ground- and surface-water diversions for...
Modeling of rock friction 1. Experimental results and constitutive equations
James H. Dieterich
1979, Conference Paper, Journal of Geophysical Research B: Solid Earth
Direct shear experiments on ground surfaces of a granodiorite from Raymond, California, at normal stresses of ??6 MPa demonstrate that competing time, displacement, and velocity effects control rock friction. It is proposed that the strength of the population of points of contacts between sliding surfaces determines frictional strength and that...
Random crustal magnetization and its effect on coherence of short-wavelength marine magnetic anomalies
R.J. Blakely
1979, Earth and Planetary Science Letters (46) 43-48
Recent studies of DSDP samples from layer 2A of oceanic basement have found complex magnetic stratigraphies that seem incompatible with the frequent existence of linear short-wavelength anomalies caused by palaeomagnetic field behavior. Statistical models are developed for the lateral variation of...
The Parkfield prediction experiment
A. Lindh, P. Evans, P. Harsh, G. Buhr
1979, Earthquake Information Bulletin (USGS) (11) 209-213
The San Andreas fault is part of the boundary between the Pacific and North American crustal plates. In California, movements of about 3 centimeters per year are currently taking place along the fault, although plat tectonic models suggest a faster rate of 5 cm/yr may be the average over a...
Geomagnetic paleointensities by the Thelliers' method from submarine pillow basalts: Effects of seafloor weathering
Sherman Gromme, Edward A. Mankinen, Monte Marshall, Robert S. Coe
1979, Journal of Geophysical Research B: Solid Earth (84) 3553-3575
Measurements of geomagnetic paleointensity using the Thelliers' double‐heating method in vacuum have been made on 10 specimens of submarine pillow basalt obtained from 7 fragments dredged from localities 700,000 years old or younger. In the magnetic minerals, the titanium/iron ratio parameter x and the cation deficiency (oxidation) parameter x were determined by X‐ray diffraction...
Modeling and optimizing a gas-water reservoir: Enhanced recovery with waterflooding
M.E. Johnson, E.A. Monash, M.S. Waterman
1979, Journal of the International Association for Mathematical Geology (11) 63-74
Accepted practice dictates that waterflooding of gas reservoirs should commence, if ever, only when the reservoir pressure has declined to the minimum production pressure. Analytical proof of this hypothesis has yet to appear in the literature however. This paper considers a model for a gas-water reservoir with a variable production...
The immune response of rainbow trout in a standardized environment: a model for vaccine antigenicity tests
D. P. Anderson, O.L. Dixon, B.S. Roberson
1979, Fish Health News (8) iv-v
Solubility of some alkali and alkaline earth chlorides in water at moderate temperatures
M.A. Clynne, R.W. Potter II
1979, Journal of Chemical and Engineering Data (24) 338-340
Solubilities for the binary systems, salt-H2O, of the chlorides of lithium, rubidium, cesium, magnesium, calcium, strontium, and barium from near 0??C to the saturated boiling point are reported. The experimental data and coefficients of an equation for a smoothed curve describing each system are listed in the tables. The data...
Modern marine sediments as a natural analog to the chemically stressed environment of a landfill
M.J. Baedecker, W. Back
1979, Journal of Hydrology (43) 393-414
Chemical reactions that occur in landfills are analogous to those reactions that occur in marine sediments. Lateral zonation of C, N, S, O, H, Fe and Mn species in landfills is similar to the vertical zonation of these species in marine sediments and results from the following reaction sequence: (1)...
Chemical composition of Mars
J. W. Morgan, E. Anders
1979, Geochimica et Cosmochimica Acta (43) 1601-1610
The composition of Mars has been calculated from the cosmochemical model of Ganapathy and Anders (1974) which assumes that planets and chondrites underwent the same 4 fractionation processes in the solar nebula. Because elements of similar volatility stay together in these processes, only 4 index elements (U, Fe, K and Tl or...
Four-dimensional modeling of recent vertical movements in the area of the southern California uplift
Petr Vanicek, Michael R. Elliot, Robert O. Castle
1979, Tectonophysics (52) 287-300
This paper describes an analytical technique that utilizes scattered geodetic relevelings and tide-gauge records to portray Recent vertical crustal movements that may have been characterized by spasmodic changes in velocity. The technique is based on the fitting of a time-varying algebraic surface of prescribed degree to the geodetic data treated...
