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Earthquakes, January-February 1981
W. J. Person
1981, Earthquake Information Bulletin (USGS) (13) 191-194
The first 2 months of the year were somewhat active, seismically speaking. Two major earthquakes (magnitude 7.0-7.9) occurred during the month of January, a magnitude 7.1 Japan on the 8th and a magntidue 7.1 in the Aleutian Islands on the 30th. Fatalities and damage were experienced in Irian Jaya (formerly...
Toxicity of six bird control chemicals to aquatic organisms
L. L. Marking, J. H. Chandler Jr.
1981, Bulletin of Environmental Contamination and Toxicology (26) 705-716
The U.S. Fish and Wildlife Service (FWS) has supported research on control methods for nuisance birds, mammals, plants, and fish. Although chemical agents have shown great promise, resource managers and regulatory agencies must be assured that these materials are safe to man and the environment. Standardized toxicity tests are conducted...
Seismology program; California Division of Mines and Geology
R. W. Sherburne
1981, Earthquake Information Bulletin (USGS) (13) 65-68
The year 1980 marked the centennial of the California Division of Mines and Geology (CDMG) and a decade of the Division's involvement in seismology. Factors which contributed to the formation of a Seismology Group within CDMG included increased concerns for environmental and earthquake safety, interest in earthquake prediction, the 1971...
U-Th-Pb systematics of some granitoids from the northeastern Yilgarn Block, Western Australia and implications for uranium source rock potential
J. S. Stuckless, J.A. Bunting, Ignatius T. Nkomo
1981, Journal of the Geological Society of Australia (28) 365-375
The Mount Boreas‐type granite and spatially associated syenitic granitoid of Western Australia yield Pb‐Pb ages of 2370 ± 100 Ma and 2760 ± 210 Ma, respectively. Th‐Pb ages, although less precise, are concordant with these ages, and therefore the apparent ages are interpreted to be the crystallisation ages for these two units....
The U.S. Earthquake Prediction Program
R. L. Wesson, J.R. Filson
1981, Earthquake Information Bulletin (USGS) (13) 164-174
Following on from the concepts of plate tectonics, the earth sciences are now embarking on a challenging course- the time prediction of geologic phenomena. Earthquake prediction is an outstanding example of this. However, earthquake prediction is not the only scientific goal. The destructive power of a large earthquake requires that...
A stochastic fault model. 2. Time-dependent case
D.J. Andrews
1981, Journal of Geophysical Research Solid Earth (86) 10821-10834
A random model of fault motion in an earthquake is formulated by assuming that the slip velocity is a random function of position and time truncated at zero, so that it does not have negative values. This random function is chosen to be self-affine; that is, on change of length...
U-Pb isotope systematics and age of uranium mineralization, Midnite mine, Washington.
K.R. Ludwig, J. T. Nash, C. W. Naeser
1981, Economic Geology (76) 89-110
Uranium ores at the Midnite mine, near Spokane, Washington, occur in phyllites and calcsilicates of the Proterozoic Togo Formation, near the margins of an anomalously uraniferous, porphyritic quartz monzonite of Late Cretaceous age. The present geometry of the ore zones is tabular, with the thickest zones above depressions in the...
Regional geochemical studies in the Patagonia Mountains, Santa Cruz County, Arizona
M.A. Chaffee, R. H. Hill, S. J. Sutley, J.R. Watterson
1981, Journal of Geochemical Exploration (14) 135-153
The Patagonia Mountains in southern Arizona contain the deeply buried porphyry copper system at Red Mountain as well as a number of other base- and precious-metal mines and prospects. The range contains complex Basin and Range geology with units ranging in age from Precambrian to Holocene. Rock types present include...
The earliest seeds
W.H. Gillespie, G.W. Rothwell, S.E. Scheckler
1981, Nature (293) 462-464
Lagenostomalean-type seeds in bifurcating cupule systems have been discovered in the late Devonian Hampshire Formation of Randolph County, West Virginia, USA (Fig. 1). The associated megaflora, plants from coal balls, and vertebrate and invertebrate faunas demonstrate that the material is Famennian; the microflora indicates a more specific Fa2c age. Consequently,...
Variations in stable- isotope ratios of ground waters in seismically active regions of California
J. R. O’Neil, Chi-Yu King
1981, Geophysical Research Letters (8) 429-432
Measurements of D and 18O concentrations of ground waters in seismically active regions are potentially useful in earthquake prediction and in elucidating mechanisms operative during earthquakes. Principles of this method are discussed and some preliminary data regarding a magnitude 5.7 earthquake at the Oroville Dam in 1975...
The distribution of uranium and thorium in granitic rocks of the basin and range province, Western United States
J.M. McNeal, D. E. Lee, Hugh T. Millard Jr.
1981, Journal of Geochemical Exploration (14) 25-40
Some secondary uranium deposits are thought to have formed from uranium derived by the weathering of silicic igneous rocks such as granites, rhyolites, and tuffs. A regional geochemical survey was made to determine the distribution of uranium and thorium in granitic rocks of the Basin and Range province in order...
Interaction between diapirism and sediment loading at the shelf-slope boundary, northwest Gulf of Mexico
A. R. Trippet
1981, Geo-Marine Letters (1) 111-114
During the last low stand of sea level, rivers and streams drained across the present northwestern Gulf of Mexico continental shelf depositing sediments in several shallow-water deltas near the present shelf-slope boundary. The weight of these wedges of prograded sediments triggered or augmented both subsidence of local depositional basins and...
Use of 35-mm color aerial photography to acquire mallard sex ratio data
Edgar L. Ferguson, Dennis G. Jorde, John L. Sease
1981, Photogrammetric Engineering and Remote Sensing (47) 823-827
A conventional 35-mm camera equipped with an f2.8 135-mm lens and ASA 64 color film was used to acquire sex ratio data on mallards (Anas platyrhynchos) wintering in the Platte River Valley of south-central Nebraska. Prelight focusing for a distance of 30.5 metres and setting of shutter speed at 1/2000...
Earthquakes, May-June 1981
W. J. Person
1981, Earthquake Information Bulletin (USGS) (13) 225-227
The months of May and June were somewhat quiet, seismically speaking. There was one major earthquake (7.0-7.9) off the west coast of South Island, New Zealand. The most destructive earthquake during this reporting period was in southern Iran on June 11 which caused fatalities and extensive damage. Peru also experienced...
Sterilization of sea lampreys (Petromyzon marinus) by immersion in an aqueous solution of bisazir
Lee H. Hanson
1981, Canadian Journal of Fisheries and Aquatic Sciences (38) 1285-1289
Groups of sea lamprey (Petromyzon marinus) eggs fertilized by males previously immersed in an aqueous solution of p,p-bis(1-aziridinyl)-N-methylphosphinothioic amide (bisazir) at concentrations of 10–100 mg/L produced fewer normal, live prolarvae after 15–17 d of incubation than did groups of eggs fertilized by normal males. Mortality of embryos or prolarvae was nearly 100% in...
Culture, feeding, and growth of alewives hatched in the laboratory
John W. Heinrich
1981, Progressive Fish-Culturist (43) 3-7
Alewives (Alosa pseudoharengus) were reared from the egg to the early juvenile life stage. The major obstacle to rearing alewives from the egg — providing an acceptable food that facilitates first feeding — was overcome by presenting a mixture of wild Zooplankton to the larvae twice daily, beginning on the...