Seismic velocities and attenuation from borehole measurements near the Parkfield prediction zone, Central California
James F. Gibbs, Edward F. Roth
1989, Earthquake Spectra (5) 513-537
Shear (S)- and compressional (P)- wave velocities were measured to a depth of 195 m in a borehole near the San Andreas fault where a recurrence of a moderate Parkfield earthquake is predicted. S-wave velocities determined from orthogonal directions of the S-wave source show velocity differences of approximately 20 percent....
New evidence for global tectonic zones on Venus
R.C. Kozak, G. G. Schaber
1989, Geophysical Research Letters (16) 175-178
Venera 15 and 16 spacecraft images show clear evidence of major crustal disruptions on Venus which have been interpreted to indicate crustal divergence. Complementary to the divergent zones are mountain belts that border the continent-like high terrains. The requisite transcurrent motions appear to be manifested as diffuse shear zones. The...
Mechanisms of Cenozoic tectonic rotation, Pacific Northwest Convergent Margin, U.S.A.
Ray E. Wells
1989, Book chapter, Paleomagnetic rotations and continental deformation. NATO ASI Series (C: Mathematical and Physical Sciences)
Large clockwise rotations (15–80°) are characteristic of Cenozoic volcanic and sedimentary rocks along the convergent margin of the northwestern United States. Abundant paleomagnetic data from 62–12 m.y. old rocks in forearc, arc, and backarc regions show that rotation increases with age and with proximity to the coast. Paleomagnetic and structural...
Evaluating the intensity of United States earthquakes
C. W. Stover
1989, Earthquakes & Volcanoes (USGS) (21) 45-53
Measuring the size of an earthquake
W. Spence, S.A. Sipkin, G. L. Choy
1989, Earthquakes & Volcanoes (USGS) (21) 58-63
Earthquakes range broadly in size. A rock-burst in an Idaho silver mine may involve the fracture of 1 meter of rock; the 1965 Rat Island earthquake in the Aleutian arc involved a 650-kilometer length of the Earth's crust. Earthquakes can be even smaller and even larger. If an earthquake is...
Answers from deep inside the Earth; Continental Scientific Drilling at Cajon Pass, California
D. P. Russ
1989, Earthquakes & Volcanoes (USGS) (21) 79-84
Drilling of a 12,000-foot-deep scientific well has been completed at Cajon Pass in southern California to measure crustal properties, to determine crustal structure, and to better understanding the generation of earthquakes along the San Andreas fault. A joint effort of the National Science Foundation (NFS) and the U.S Geological Survey...
Paleomagnetism and tectonic rotation of the lower Miocene Peach Springs Tuff: Colorado Plateau, Arizona, to Barstow, California
Ray E. Wells, John W. Hillhouse
1989, GSA Bulletin (101) 846-863
We have determined remanent magnetization directions of the lower Miocene Peach Springs Tuff at 41 localities in western Arizona and southeastern California. An unusual northeast and shallow magnetization direction confirms the proposed geologic correlation of isolated outcrops of the tuff from the Colorado Plateau to Barstow, California, a distance of...
NEIC; the National Earthquake Information Center
R.P. Masse, R.E. Needham
1989, Earthquakes & Volcanoes (USGS) (21) 4-45
Mexico was hit by one of the most devastating earthquakes in its history on September 19, 1985 at 7:18 a.m. MDT time. this earthquake, which was centered about 380 kilometers west-southwest of Mexico City, had a surface-wave magnitude of 8.1. In less than a minute, seismic waves from this earthquake...
Status of the flora and fauna on the Nevada Test Site in 1987
R.B. Hunter, P.A. Medica
1989, Technical Report DOE/NV/10630-2
No abstract available at this time...
The use of non-riparian habitats by least Bell's vireos (Vireo bellii pusillus)
B.E. Kus, K.L. Miner
1989, General Technical Report PSW-110
No abstract available at this time...
Duck harvest on public hunting areas in California
D.S. Gilmer, J.M. Hicks, J. P. Fleskes, D.P. Connelly
1989, California Fish and Game (75) 155-168
We summarized hunter visits and success, and the magnitude and species composition of the duck harvest recorded on California public hunting areas (PHAs) during 1950-87. Hunter visits and harvest increased during 1950-74 as new PHAs were added, then declined concurrently with duck populations. Of six geographic regions, the Sacramento Valley,...
Geology and K-Ar geochronology of the Paradise Peak Mine and the relationship of pre-Basin and Range extension to Early Miocene precious metal mineralization in west-central Nevada
D. A. John, R.E. Thomason, E.H. McKee
1989, Economic Geology (84) 631-649
The Paradise Peak mine is a major gold-silver-mercury deposit located in the southwestern part of the Paradise Range near the eastern edge of the Walker Lane in the western Great Basin, Nevada. The Tertiary volcanic rocks of the area can be divided into...
Revised paleomagnetic pole for the Sonoma Volcanics, California
E. A. Mankinen
1989, Geophysical Research Letters (16) 1081-1084
Paleomagnetic sampling of the Miocene and Pliocene Sonoma Volcanics, northern California, was undertaken to supplement an earlier collection. Data from 25 cooling units yield positive fold and reversal tests, and a paleomagnetic pole located at 80.2°N., 069.2°E., with α95 = 6.8°. This paleopole is significantly displaced (9.6°...
Heat flow and thermotectonic problems of the central Ventura Basin, southern California
R. F. De Rito, A.H. Lachenbruch, T. H. Moses Jr., R. J. Munroe
1989, Journal of Geophysical Research Solid Earth (94) 681-699
The Ventura Basin, southern California, is located near the Big Bend area of the San Andreas fault system, within the Transverse Ranges physiographic province. Continuous equilibrium temperature logs were measured in 12 idle oil wells located within the onshore Ventura Avenue, San Miguelito, Filmore, Oxnard, and West Montalvo fields to...
Discussion of "Influence of temperature on oxygen transfer" by Allen C. Chao, David S. Chang, Charles Smallwood, Jr., and William S. Galler (August, 1987, Vol. 113, No. 4)
R.E. Rathburn
1989, Journal of Environmental Engineering (115) 868-869
No abstract available....
Spectroscopic evidence for organic diacid complexation with dissolved silica in aqueous systems—I. Oxalic acid
N.A. Marley, P. Bennett, D.R. Janecky, J.S. Gaffney
1989, Organic Geochemistry (14) 525-528
Increased solubility of quartz and mobilization in contaminated groundwater due to the complexation with dissolved organic acids has been recently proposed [Bennett and Siegel, Nature326, 684–686 (1987)]. Using laser Raman and Fourier transform infrared spectroscopies, we have examined mixed solutions of oxalic and silicic acids at near neutral pH in...
Potentiometric surface of the lower Cape Fear aquifer in the central coastal plain of North Carolina, December 1986
M. D. Winner Jr., William L. Lyke, Allen R. Brockman
1989, Water-Resources Investigations Report 87-4234
Water level measurements were made in four wells open to the lower Cape Fear aquifer at the end of 1986 to determine the configuration of its potentiometric surface over an area of approximately 4,100 sq mi. Because of the scarcity of data, five earlier measurements were also used to help...
Remote characterization of marine bird habitats with satellite imagery
J. Christopher Haney
1989, Colonial Waterbirds (12) 67-77
Remote sensing techniques such as radar altimetry, synthetic aperture radar, coastal zone color scanning, and infrared radiometry provide effective, instantaneous, and relatively inexpensive means for characterizing critical habitats of marine birds. In order to make optimal use of satellite-derived data, the rationale for marine habitat classification is presented, and advantages...
Continued studies on opiods and hibernation: Does the polar bear (Ursus maritimus) hibernate?
David S. Bruce, Nancy K. Darling, Katheleen J. Seeland, Peter R. Oeltgen, Sita P. Nilekani, Steven C. Amstrup
Andre Malan, Bernard Canguilhem, editor(s)
1989, Conference Paper, Proceedings of the second international symposium on living in the cold (Colloque Inserm volume 193)
No abstract available....
Earthquakes, January-February 1989
W. J. Person
1989, Earthquakes & Volcanoes (USGS) (21) 125-127
there were no major earthquakes (7.0-7.9) during the first 2 months of the year. the USSR was the only country reporting earthquake-related deaths during this period. In the United States a magnitude 5.0 earthquake in southern California on Januray 19 caused several injuries and minor damage. ...
Compaction of basin sediments: Modeling based on time-temperature history
J. W. Schmoker, D. L. Gautier
1989, Journal of Geophysical Research Solid Earth (94) 7379-7386
Porosity decrease of sandstones, carbonates, and shales during burial is modeled here in terms of time-temperature exposure rather than in terms of depth. Loss of porosity (ϕ) in the subsurface is represented by a power function, ϕ = A(M)B, where A and B are constants and M is a measure of integrated time-temperature history. Regression lines of...
Retention and transport of nutrients in a third-order stream in northwestern California; hyporheic processes
F.J. Triska, V. C. Kennedy, R.J. Avanzino, G. W. Zellweger, K.E. Bencala
1989, Ecology (70) 1893-1905
Chloride and nitrate were coinjected into the surface waters of a third—order stream for 20 d to examine solute retention, and the fate of nitrate during subsurface transport. A series of wells (shallow pits) 0.5—10 m from the adjacent channel were sampled to estimate the lateral interflow of water. Two...
Origin and transport of chloride in superheated geothermal steam
A.H. Truesdell, J.R. Haizlip, H. Armannsson, F. D’Amore
1989, Geothermics (18) 295-304
Hydrogen chloride (HCl) is a known component of some volcanic gases and volcanic-related hydrothermal systems. It has recently been discovered in superheated steam in exploited geothermal systems, usually as a result of HCl-induced corrosion of well casing and steam gathering systems....
Heavy-mineral reconnaissance off the coast of the Apalachicola river delta, northwest Florida: A summary and new interpretations
J. D. Arthur, S. Melkote, J. Applegate, T.M. Scott
1989, Marine Geology (90) 51-57
Two-hundred-and-fifty sediment samples were collected for heavy-mineral and textural analysis along the northwest Florida coastline from approximately 24 km offshore of Apalachee Bay to the same distance offshore of Pensacola Bay. The heavy-mineral suite characterizing sediments within this region consists of...
Louisiana's statewide beach cleanup
Dianne M. Lindstedt, Joseph C. Holmes Jr.
1989, Conference Paper, Coastal Zone: Proceedings of the Symposium on Coastal and Ocean Management
Litter along Lousiana's beaches has become a well-recognized problem. In September 1987, Louisiana's first statewide beach cleanup attracted about 3300 volunteers who filled 16,000 bags with trash collected along 15 beaches. An estimated 800,173 items were gathered. Forty percent of the items were made of plastic and 11% were of...
