Contemporary block tectonics: California and Nevada
D.P. Hill
1982, Journal of Geophysical Research Solid Earth (87) 5433-5450
Well-determined fault plane solution and the gross pattern of late-Cenozoic faulting in California and Nevada show a systematic relation between the orientation of fault planes and slip directions. In general, normal faults have northerly strikes, reverse faults have easterly strikes, and dextral and sinstral strike slip faults have northwesterly and...
The impact of entrainment and impingement on fish populations in the Hudson River estuary: Volume II: Impingement impact analyses, evaluations of alternative screening devices, and critiques of utility testimony relating to density-dependent growth, the age-composition of the striped bass Spawning stock, and the LMS Real-Time Life Cycle Model
L.W. Barnthouse, W. Van Winkle, J. Golumbek, G. F. Cada, C.P. Goodyear, S.W. Christensen, J.B. Cannon, D.W. Lee
1982, Report
No abstract available at this time...
Numerical models of hydrothermal circulation for the intrusion zone at an ocean ridge axis
P.L. Patterson, R.P. Lowell
Kent A. Fanning, Frank T. Manheim, editor(s)
1982, Book chapter, The dynamic environment of the ocean floor
No abstract available....
Deep structure and evolution of the Carolina Trough
D. R. Hutchinson, J. A. Grow, Kim D. Klitgord, B.A. Swift
1982, Book chapter, Studies in continental margin geology
Multichannel seismic-reflection data together with two-dimensional gravity and magnetic models suggest that the crustal structure off North Carolina consists of normal continental crust landward of the Brunswick magnetic anomaly (BMA), rift-stage crust in the 80-km-wide zone between the BMA and the East Coast magnetic anomaly (ECMA), and normal oceanic crust...
Earthquake location in island arcs
E.R. Engdahl, J. W. Dewey, K. Fujita
1982, Physics of the Earth and Planetary Interiors (30) 145-156
A comprehensive data set of selected teleseismic P-wave arrivals and local-network P- and S-wave arrivals from large earthquakes occurring at all depths within a small section of the central Aleutians is used to examine the general problem of earthquake location in island arcs. Reference hypocenters for this special data set...
Chemical and light-stable isotope characteristics of waters from the Raft River geothermal area and environs, Cassia County, Idaho; Box Elder County, Utah
M. Nathenson, N.L. Nehring, E. G. Crosthwaite, R.S. Harmon, C. Janik, J. Borthwick
1982, Geothermics (11) 215-237
Chemical and light-stable isotope data are presented for water samples from the Raft River geothermal area and environs. On the basis of chemical character, as defined by a trilinear plot of per cent milliequivalents, and light-stable isotope data, the waters in the geothermal area can be divided into waters that...
Recommended procedures and techniques for the petrographic description of bituminous coals
E. C. T. Chao, J.A. Minkin, C.L. Thompson
1982, International Journal of Coal Geology (2) 151-179
Modern coal petrology requires rapid and precise description of great numbers of coal core or bench samples in order to acquire the information required to understand and predict vertical and lateral variation of coal quality for correlation with coal-bed thickness, depositional environment, suitability for technological uses, etc. Procedures for coal...
Evolution of continental crust and mantle heterogeneity: Evidence from Hf isotopes
Patchett P. Jonathan, O. Kouvo, C. E. Hedge, M. Tatsumoto
1982, Contributions to Mineralogy and Petrology (78) 279-297
We present initial 176Hf/177 Hf ratios for many samples of continental crust 3.7-0.3 Gy old. Results are based chiefly on zircons (1% Hf) and whole rocks: zircons are shown to be reliable carriers of essentially the initial Hf itself when properly chosen on the basis of U-Pb studies. Pre-3.0 Gy...
International geomagnetic reference field 1980: a report by IAGA Division I working group.
N.W. Peddie
1982, Geophysical Journal of the Royal Astronomical Society (68) 265-268
Describes the recommendations of the working group, which suggested additions to IGRF because of the cumulative effect of the inevitable uncertainties in the secular variation models which had led to unacceptable inaccuracies in the IGRF by the late 1970's. The recommendations were accepted by the International Association of Geomagnetism and...
Unroofing history of a suture zone in the Himalaya of Pakistan by means of fission-track annealing ages
P.K. Zeitler, R.A.K. Tahirkheli, C. W. Naeser, N.M. Johnson
1982, Earth and Planetary Science Letters (57) 227-240
The uplift history of the Swat Valley and Hazara region of northwestern Pakistan has been established using 22 fission-track dates on apatite, zircon and sphene. A major fault, the Main Mantle Thrust (MMT) strikes east-west across the Swat Valley, separates regions...
Geochemical indices of fine sediment transport, northwest Gulf of Mexico
C. W. Holmes
1982, Journal of Sedimentary Petrology (52) 307-321
The 210 Pb distribution, the clay mineralogy distribution, and the distribution of three trace metals, barium, lead, and manganese, in the sediments of the south Texas shelf are related to the dynamics of the sedimentary transport process. 210 Pb, whose concentration is time dependent, defines three loci...
Late Pleistocene- Holocene transgressive sedimentation in deltaic and non-deltaic areas of the northeastern Bering epicontinental shelf.
C.H. Nelson
1982, Geologie en Mijnbouw (61) 5-18
The distribution of late Pleistocene and Holocene surface sediments on the northern Bering Seafloor is patchy and dependent upon locations of seafloor bedrock and pre-late Pleistocene glacial debris, late Holocene river sediment influx, and modern strong bottom currents. Seafloor vibracores and high-resolution profiles record two different sedimentary environments in the...
An analysis of input errors in precipitation-runoff models using regression with errors in the independent variables
Brent M. Troutman
1982, Water Resources Research (18) 947-964
Errors in runoff prediction caused by input data errors are analyzed by treating precipitation-runoff models as regression (conditional expectation) models. Independent variables of the regression consist of precipitation and other input measurements; the dependent variable is runoff. In models using erroneous input data, prediction errors are inflated and estimates of...
The graphic cell method: a new look at digitizing geologic maps
J.T. Hanley
1982, Computers & Geosciences (8) 149-161
The graphic cell method is an alternative method of digitizing areal geologic information. It involves a discrete-point sampling scheme in which the computer establishes a matrix of cells over the map. Each cell and the whole cell is assigned the identity or value of the geologic information that is recognized...
Periodic climate change on Mars: Review of evidence and effects on distribution of volatiles
M. H. Carr
1982, Icarus (50) 129-139
The polar regions of Mars preserve, in both their layering and their topography, a record of recent climate changes. Because of the coincidence of the growth of the northern seasonal cap with global dust storms, dust may be currently accumulating on...
The oxygen isotope composition of granitoid and sedimentary rocks of the southern Snake Range, Nevada
D. E. Lee, I. Friedman, J.D. Gleason
1982, Contributions to Mineralogy and Petrology (79) 150-158
Six diverse intrusive igneous types are exposed as discrete outcrops within an area of 900 km2 in the southern Snake Range, White Pine County, Nevada. The previously recognized variety among these igneous types is reflected in the wide range of ??18O values (-1.1 to 13.4 permil) found in these rocks....
Stability of βMnOOH and manganese oxide deposition from springwater
J.D. Hem, C. E. Roberson, Reba B. Fournier
1982, Water Resources Research (18) 563-570
Beta MnOOH is precipitated preferentially (with respect to Mn3O4) at temperatures near O°C when Mn2+ is oxidized in aerated aqueous solutions. Upon aging in solutions open to the atmosphere a slurry of βMnOOH tends to disproportionate to form MnO2 and Mn2+. In such aged solutions, Mn2+ and H+ activities can be constant, and both...
Incorporation of prior information on parameters into nonlinear regression groundwater flow models: 1. Theory
Richard L. Cooley
1982, Water Resources Research (18) 965-976
Prior information on the parameters of a groundwater flow model can be used to improve parameter estimates obtained from nonlinear regression solution of a modeling problem. Two scales of prior information can be available: (1) prior information having known reliability (that is, bias and random error structure) and (2) prior...
Upper crustal structure of the Mount Hood, Oregon, region as revealed by time term analysis
W.M. Kohler, J. H. Healy, S.S. Wegener
1982, Journal of Geophysical Research Solid Earth (87) 339-355
Seismic refraction data with a dense areal distribution were collected to study the seismic structure of Mount Hood and the surrounding region. This area is typical of Cascade volcanoes and is geologically quite complex. The prime goals of this project were to search for velocity variations in the upper crustal...
Comparison of techniques for estimating annual lake evaporation using climatological data
M.E. Andersen, H.E. Jobson
1982, Water Resources Research (18) 630-636
Mean annual evaporation estimates were determined for 30 lakes by use of a numerical model (Morton, 1979) and by use of an evaporation map prepared by the U.S. Weather Service (Kohler et al., 1959). These estimates were compared to the reported value of evaporation determined from measurements on each lake....
Huge landslide blocks in the growth of piton de la fournaise, La réunion, and Kilauea volcano, Hawaii
Wendell A. Duffield, Laurent Stieltjes, Jacques Varet
1982, Journal of Volcanology and Geothermal Research (12) 147-160
Piton de la Fournaise, on the island of La Réunion, and Kilauea volcano, on the island of Hawaii, are active, basaltic shield volcanoes growing on the flanks of much larger shield volcanoes in intraplate tectonic environments. Past studies have shown that the average rate of magma production and the chemistry...
Differential compaction mechanism for earth fissures near Casa Grande, Arizona
R.C. Jachens, T.L. Holzer
1982, Geological Society of America Bulletin (93) 998-1012
Precise gravity measurements indicate that earth fissures or tension cracks caused by ground-water withdrawal within a 10-km2 area southeast of Casa Grande, Arizona, are associated with relief on the buried interface between the alluvial aquifer and underlying bedrock. All of the fissure zones; which...
Accumulation rates of Th-230, Pa-231, and some transition metals on the Bermuda Rise
M.P. Bacon, J.N. Rosholt
1982, Geochimica et Cosmochimica Acta (46) 651-666
Measurements of 238U, 234U, 230Th, 232Th, 231Pa, Mn, Fe, Co, Ni, Cu, and Zn were made on 23 samples from core GPC-5, a 29-m giant piston core from a water depth of 4583 m on the northeastern Bermuda Rise (33°41.2′N, 57°36.9′W). This area is characterized by rapid deposition of sediment transported by abyssal currents. Unsupported 230Th...
Application of modulus degradation model of clays
A.T.F. Chen
1982, Journal of the Geotechnical Engineering Division, ASCE (108) 1203-1214
A degradation model is applied in conjunction with different soil models and stress-strain relations to site response analyses during earthquakes. To evaluate the effects of degradation, computations on two clay deposits subjected to both high and low-level input excitations are conducted. In addition, modulus degradation with or without shear strength...
Worth of geophysical data in natural- disaster- insurance rate setting.
E. D. Attanasi, M.R. Karlinger
1982, Journal of Applied Meteorology and Climatology (21) 453-460
Insurance firms that offer natural-disaster insurance base their rates on available information. The benefits from collecting additional data and incorporating this information to improve parameter estimates of probability distributions that are used to characterize natural-disaster events can be determined by computing changes in premiums as a function of additional data....
