Publications
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Monterey Bay marine sanctuary geological processes and framework Monterey Bay marine sanctuary geological processes and framework
No abstract available.
Authors
Michael E. Field
Remote rainfall sensing for landslide hazard analysis Remote rainfall sensing for landslide hazard analysis
Methods of assessing landslide hazards and providing warnings are becoming more advanced as remote sensing of rainfall provides more detailed temporal and spatial data on rainfall distribution. Two recent landslide disasters are examined noting the potential for using remotely sensed rainfall data for landslide hazard analysis. For the June 27, 1995, storm in Madison County, Virginia...
Authors
Gerald F. Wieczorek, Harry McWreath, Clay Davenport
Abstracts of the Annual planetary geologic mappers meeting; June 22-24, 2000, Flagstaff, Arizona Abstracts of the Annual planetary geologic mappers meeting; June 22-24, 2000, Flagstaff, Arizona
No abstract available.
Authors
Kenneth L. Tanaka, Derrick D. Hirsch
Landslides induced by Hurricane Mitch in El Salvador -- an inventory and descriptions of selected features Landslides induced by Hurricane Mitch in El Salvador -- an inventory and descriptions of selected features
No abstract available.
Authors
Anthony J. Crone, Rex L. Baum, David J. Lidke, Damon Sather, Lee-Ann Bradley, Arthur C. Tarr
Landslides triggered by Hurricane Mitch in Guatemala -- inventory and discussion Landslides triggered by Hurricane Mitch in Guatemala -- inventory and discussion
The torrential rains that accompanied Hurricane Mitch in October and November of 1998 triggered thousands of landslides in the moderate to steep terrain bordering the Motagua and Polochic Rivers in eastern Guatemala. Using aerial photographs taken between January and March 2000 we mapped all visible landslides larger than about 15 m in minimum dimension in a study area of 10,000 km2...
Authors
Robert C. Bucknam, Jeffrey A. Coe, Manuel Mota Chavarria, Jonathan W. Godt, Arthur C. Tarr, Lee-Ann Bradley, Sharon A. Rafferty, Dean Hancock, Richard L. Dart, Margo L. Johnson
Borehole, surface geologic, and geotechnical data for the Aspen Grove landslide, Sanpete County, Utah Borehole, surface geologic, and geotechnical data for the Aspen Grove landslide, Sanpete County, Utah
No abstract available.
Authors
Rex L. Baum, Robert W. Fleming
Implications for the formation of the Hollywood Basin from gravity interpretations of the northern Los Angeles Basin, California Implications for the formation of the Hollywood Basin from gravity interpretations of the northern Los Angeles Basin, California
Gravity data provide insights on the complex tectonic history and structural development of the northern Los Angeles Basin region. The Hollywood basin appears to be a long (> 12 km), narrow (up to 2 km wide) trough lying between the Santa Monica Mountains and the Wilshire arch. In the deepest parts of the Hollywood basin, the modeled average thickness ranges from roughly 250 m if filled...
Authors
Thomas G. Hildenbrand, Jeffrey G. Davidson, Daniel J. Ponti, V.E. Langenheim
By
Natural Hazards Mission Area, Geology, Energy, and Minerals Mission Area, Earthquake Hazards Program, Energy Resources Program, Mineral Resources Program, Science and Decisions Center, Groundwater and Streamflow Information Program, Earthquake Science Center, Geology, Minerals, Energy, and Geophysics Science Center
How brucite may affect the frictional properties of serpentinite How brucite may affect the frictional properties of serpentinite
The frictional strength of brucite gouge has been measured at hydrothermal conditions to 450°C. At room temperature, brucite has a coefficient of friction, μ ≈ 0.30, making it one of the weakest minerals identified to date. With increasing temperature at a constant effective normal stress, the coefficient of friction of brucite decreases to a minimum of μ ≈ 0.20 near 300°C, and μ ≈ 0.22...
Authors
Diane E. Moore, David A. Lockner, K. Iwata, H. Tanaka, J.D. Byerlee
Energy-to-moment ratios for damaging intraslab earthquakes: preliminary results on a few case studies Energy-to-moment ratios for damaging intraslab earthquakes: preliminary results on a few case studies
We use the energy-to-moment ratio, as introduced by Newman and Okal [1998] to examine the source characteristics of normal-faulting intraslab earthquakes, compared to nearby interplate thrust events, based on recent case studies in central Chile and southeastern Mexico. In Chile, we find that the 1997 intraslab event had an exceptionally large E/M0 ratio, 30 times greater than the nearby
Authors
Emile A. Okal, S. H. Kirby
Density and velocity relationships for digital sonic and density logs from coastal Washington and laboratory measurements of Olympic Peninsula mafic rocks and greywackes Density and velocity relationships for digital sonic and density logs from coastal Washington and laboratory measurements of Olympic Peninsula mafic rocks and greywackes
Three-dimensional velocity models for the basins along the coast of Washington and in Puget Lowland provide a means for better understanding the lateral variations in strong ground motions recorded there. We have compiled 16 sonic and 18 density logs from 22 oil test wells to help us determine the geometry and physical properties of the Cenozoic basins along coastal Washington. The depth...
Authors
Thomas M. Brocher, Nikolas I. Christensen
Map showing plutons and accreted terranes of the Sierra Nevada, California, with a tabulation of U/Pb isotopic ages Map showing plutons and accreted terranes of the Sierra Nevada, California, with a tabulation of U/Pb isotopic ages
No abstract available.
Authors
William P. Irwin, Joseph L. Wooden
Debris-flow and flooding hazards associated with the December 1999 storm in coastal Venezuela and strategies for mitigation Debris-flow and flooding hazards associated with the December 1999 storm in coastal Venezuela and strategies for mitigation
Heavy rainfall from the storm of December 14-16, 1999 triggered thousands of landslides on steep slopes of the Sierra de Avila north of Caracas, Venezuela. In addition to landslides, heavy rainfall caused flooding and massive debris flows that damaged coastal communities in the State of Vargas along the Caribbean Sea. Examination of the rainfall pattern obtained from the GOES-8 satellite...
Authors
G. F. Wieczorek, M. C. Larsen, L.S. Eaton, B. A. Morgan, J. L. Blair