Alberto Condes de la Torre
1994, Open-File Report 94-84
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Publication Extents
Not all publications have extents, not all extents are completely accurateWalter D. Mooney, N.I. Christensen
1994, Tectonophysics (236) 391-408
We infer the composition of the crust beneath and on the flanks of the Kenya rift based on a comparison of the KRISP-90 crustal velocity structure with laboratory measurements of compressional-wave velocities of rock samples from Kenya. The rock samples studied, which are representative of the major lithologies exposed in...
Mark A. Middendorf, K.C. Thomas, C.E. Robertson, J.W. Whitfield, E.E. Glick, W. V. Bush, B.R. Haley, J.D. McFarland
1994, Open-File Report 94-430
T. P. Miller
1994, Journal of Volcanology and Geothermal Research (62) 197-212
Much of the six-month-long 1989-1990 eruption of Redoubt Volcano consisted of a dome-growth and -destructive phase in which 14 short-lived viscous silicic andesite domes were emplaced and 13 subsequently destroyed. The life span of an individual dome ranged from 3 to 21 days and volumes are estimated at 1 ??...
M. E. Ikehara
1994, Hydrological Sciences Journal (39) 417-429
A subsidence research program began in 1985 to document the extent and magnitude of land subsidence in Sacramento Valley, California, an area of about 15 600 km2, using Global Positioning System (GPS) surveying. A brief description of GPS surveying is followed by a summary of each of four surveys between...
D. Shao, E.J. Hutchinson, H. Cao, W.-P. Pan, C. L. Chou
1994, Energy & Fuels (8) 399-401
No abstract available....
R.L. Wershaw, G. R. Aiken, T.E. Imbrigiotta, M. C. Goldberg
1994, Journal of Environmental Quality (23) 792-798
Dense nonaqueous phase liquids (DNAPLS) are important pollutants because of their widespread use as chemical and industrial solvents. An example of the pollution caused by the discharge of DNAPLs is found at the Picatinny Arsenal, New Jersey, where trichloroethylene (TCE) has been discharged directly into the unsaturated zone. This discharge...
Kenneth S. Johnson
Anon, editor(s)
1994, Conference Paper, National Conference Publication - Institution of Engineers, Australia
Saline seeps are an increasingly serious problem in semi-arid regions of the southwestern United States. They result when excessive recharge of the shallow ground water in soils raises the water table locally to within one meter of the land surface, and the salinity of the shallow water is increased through...
Jeffrey S. Kargel, Randolph L. Kirk, Bruce Fegley Jr., Allan H. Treiman
1994, Icarus (112) 219-252
Venusian canali, outflow channels, and associated volcanic deposits resemble fluvial landforms more than they resemble volcanic features on Earth and Mars. Some canali have meandering habits and features indicative of channel migration that are very similar to meandering river channels and flood plains on Earth, venusian outflow channels closely resemble...
L. A. Bradley, Thomas W. Stafford Jr.
1994, Radiocarbon (36) 399-405
A new automated pretreatment system for the preparation of materials submitted for accelerator mass spectrometry (AMS) analysis is less time-consuming and results in a higher sample yield. The new procedure was tested using two groups of plant fossils: one group was pretreated using the traditional method, and the second, using...
Chintu Lai
1994, Journal of Hydraulic Engineering (120) 378-395
For unsteady open-channel flows having N interacting unknown variables, a system of N mutually independent, partial differential equations can be used to describe the flow-field. The system generally belongs to marching-type problems and permits transformation into characteristic equations that are associated with N distinct characteristics directions. Because characteristics can be...
William Panageotou, Jeffrey Halka
McNair Clark E., editor(s)
1994, Conference Paper, International Conference on Dredging and Dredged Material Placement
From the mid 1960's until 1991, dredging and disposal occurred in the northern Chesapeake Bay without guidelines to maximize the capacity and to minimize the spread of the deposits beyond the disposal sites, particularly toward the navigation channel. Planning for future dredging projects is dependant upon the remaining site capacity...
J.C. Hower, C.T. Helfrich, D.A. Williams
1994, International Journal of Coal Geology (26) 117-132
The McLeansboro Group (formerly the Sturgis Formation) in the Western Kentucky coal field spans the upper Desmoinesian (Westphalian D) and the Missourian and Virgilian series (Stephanian). Extensive drilling has demonstrated the lateral continuity of major and minor beds in the group,...
A.M. Trehu, I. Asudeh, Thomas M. Brocher, James H. Luetgert, Walter D. Mooney, J.L. Nabelek, Y. Nakamura
1994, Science (266) 237-243
Seismic profiling data indicate that the thickness of an accreted oceanic terrane of Paleocene and early Eocene age, which forms the basement of much of the forearc beneath western Oregon and Washington, varies by approximately a factor of 4 along the strike of the Cascadia subduction zone. Beneath the Oregon...
E. Safak, A. Frankel
1994, Journal of Structural Engineering (120) 2820-2839
Structural repsonse to one- and three-dimensional (3D) simulated motions in San Bernardino Valley from a hypothetical earthquake along the San Andreas fault with moment magnitude 6.5 and rupture length of 30km is investigated. The results show that the ground motions and the structural response vary dramatically with the type of...
A. T. Linde, I. S. Sacks, M.J.S. Johnston, D.P. Hill, R.G. Bilham
1994, Nature (371) 408-410
Aftershocks of large earthquakes tend to occur close to the main rupture zone, and can be used to constrain its dimensions. But following the 1992 Landers earthquake (magnitude M(w) = 7.3) in southern California, many aftershocks were reported in areas remote from the mainshock. Intriguingly, this remote seismicity occurred in...
D. W. Peterson, R. T. Holcomb, R.I. Tilling, R.L. Christiansen
1994, Bulletin of Volcanology (56) 343-360
During the 1969-1974 Mauna Ulu eruption on Kilauea's upper east rift zone, lava tubes were observed to develop by four principal processes: (1) flat, rooted crusts grew across streams within confined channels; (2) overflows and spatter accreted to levees to build arched roofs across streams; (3) plates of solidified crust...
W. R. Osterkamp, T.J. Toy
1994, Geological Society of America Bulletin (100) 1233-1241
Results of accelerated erosion on certain constructed surfaces in southeastern Arizona appear similar to those described by Bryan (1940) as gully gravure. Twenty cross-section excavations in eight rills incised into silt-rich lacustrine and fluvial deposits reveal partial filling of the rills by debris derived from overlying fluvial sand, gravel, and...
I.A. Nairn, C.P. Wood, R. A. Bailey
1994, Bulletin of Volcanology (56) 529-537
The Reporoa Caldera occupies the northern end of the Reporoa Depression, previously described as a tectonic fault-angle depression. Earlier confirmation of the topographic basin as a caldera had been hindered by the lack of an associated young pyroclastic flow deposit of large enough volume to have caused caldera collapse. New...
B.H. Bryant
1994, Open-File Report 94-153
L.F.W. Duell
1994, Water Resources Bulletin (30) 841-859
The sensitivity of streamflow to climate change was investigated in the American, Carson, and Truckee River Basins, California and Nevada. Nine gaging stations were used to represent streamflow in the basins. Annual models were developed by regressing 1961-1991 streamflow data on temperature and precipitation. Climate-change scenarios were used as inputs...
J.R. Riehle, J. R. Budahn, M. A. Lanphere, D. A. Brew
1994, Canadian Journal of Earth Sciences (31) 852-864
Pleistocene basalt of the Mount Edgecumbe volcanic field (MEF) is subdivided into a plagioclase type and an olivine type. Olivine basalt crops out farther inboard from the nearby Fairweather transform than plagioclase basalt. Th/La ratios of plagioclase basalt are similar to those of mid-ocean-ridge basalt (MORB), whereas those of olivine...
J. Mechie, Gordon R. Keller, C. Prodehl, S. Gaciri, L.W. Braile, Walter D. Mooney, D. Gajewski, K.-J. Sandmeier
1994, Tectonophysics (236) 179-200
Modelling of the KRISP 90 axial line data shows that major crustal thinning occurs along the axis of the Kenya Rift from Moho depths of 35 km in the south beneath the Kenya Dome in the vicinity of Lake Naivasha to 20 km in the north beneath Lake Turkana. Low...
Nora K. Foley, Robert A. Ayuso
1994, Economic Geology (89) 1842-1859
The North Amethyst vein system, which is hosted by approximately 27 Ma Carpenter Ridge Tuff and approximately 26 Ma Nelson Mountain Tuff, has two mineral associations separated by brecciation and sedimentation in the veins. The early association consists of quartz, rhodonite, hematite, magnetite, electrum (Au (sub 0.3-0.5) Ag (sub...
David S. Mueller, Mark N. Landers
1994, Conference Paper, Proceedings of the Symposium on Fundamentals and Advancements in Hydraulic Measurements and Experimentation
The record flood on the Mississippi River during the summer of 1993 provided a rare opportunity to collect data on scour of the streambed at bridges and to test data collection equipment under extreme hydraulic conditions. Detailed bathymetric and hydraulic information were collected at two bridges crossing the Mississippi River...