Publications
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Hayward Fault rocks: porosity, density, and strength measurements Hayward Fault rocks: porosity, density, and strength measurements
Porosity, density and strength measurements were conducted on rock samples collected from the Hayward Fault region in Northern California as part of the Hayward Fault Working Group’s efforts to create a working model of the Hayward Fault. The rocks included in this study were both fine and coarse grained gabbros, altered keratophyre, basalt, sandstone, and serpentinite from various rock...
Authors
C.A. Morrow, D.A. Lockner
Landslide response to Hurricane Mitch rainfall in seven study areas in Nicaragua Landslide response to Hurricane Mitch rainfall in seven study areas in Nicaragua
No abstract available.
Authors
Susan H. Cannon, Kathleen M. Haller, Ingrid Ekstrom, Eugene S. Schweig, Graziella Devoli, David W. Moore, Sharon A. Rafferty, Arthur C. Tarr
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
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
Rock types of South Pole-Aitken basin and extent of basaltic volcanism Rock types of South Pole-Aitken basin and extent of basaltic volcanism
The enormous pre-Nectarian South Pole-Aitken (SPA) basin represents a geophysically and compositionally unique region on the Moon. We present and analyze the mineralogical diversity across this basin and discuss the implications for basin evolution. Rock types are derived from Clementine multispectral data based on diagnostic characteristics of ferrous absorptions in fresh materials...
Authors
Carle M. Pieters, James W. Head, Lisa R. Gaddis, B. Jolliff, M. Duke
Compilation of post-wildfire runoff-event data from the Western United States Compilation of post-wildfire runoff-event data from the Western United States
No abstract available.
Authors
Erica R. Bigio, Susan H. Cannon
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, National Laboratories Program, Science and Decisions Center, Groundwater and Streamflow Information Program, Earthquake Science Center, Geology, Minerals, Energy, and Geophysics Science Center
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
Monterey Bay marine sanctuary geological processes and framework Monterey Bay marine sanctuary geological processes and framework
No abstract available.
Authors
Michael E. Field
Antarctic ice streams and outflow channels on Mars Antarctic ice streams and outflow channels on Mars
New sonar images of the Antarctic sea floor reveal mega-scale glacial lineations that are strikingly similar to longitudinal flutes in martian outflow channels. The analogs suggest that ice moved through the martian channels in places and carved the flutes. The ice in martian channels may have moved like Antarctic ice streams on deformable debris saturated with water under high pore...
Authors
Baerbel K. Lucchitta
U.S. Geological Survey Karst Interest Group: proceedings, St Petersburg, Florida February 13-16, 2001 U.S. Geological Survey Karst Interest Group: proceedings, St Petersburg, Florida February 13-16, 2001
Karst and similar landscapes are found in a wide range of biogeographic classes. In the U.S. for example, Everglades, Mammoth Cave, and Hawaii Volcanoes National Parks have little in common - except karst or pseudokarst, and a cultural past (even though these are very different). This diversity of geologic settings makes karst difficult to categorize and work with when designing a...
Authors
Eve L. Kuniansky