Publications
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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 with only
Authors
Thomas G. Hildenbrand, Jeffrey G. Davidson, Daniel J. Ponti, V. E. Langenheim
By
Natural Hazards Mission Area, 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
Hydrologic data for Long Valley Caldera, Mono County, California, 1994-96
Hydrologic data were collected during 1994-96 as part of the U.S. Geological Survey's long-term Volcanic Hazards Monitoring Program of the Long Valley Caldera, Mono County, California, and the Long Valley Hydrologic Advisory Committee monitoring program. Hydrologic data collected include continuous record of ground-water levels in 4 wells; instantaneous measurements of ground-water levels in 53 we
Authors
James F. Howle, Christopher D. Farrar
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 interplat
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
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 ranges sa
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
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
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 showed th
Authors
G. F. Wieczorek, M. C. Larsen, L.S. Eaton, B. A. Morgan, J.L. Blair
Volcanoes of the Wrangell Mountains and Cook Inlet region, Alaska: selected photographs
Alaska is home to more than 40 active volcanoes, many of which have erupted violently and repeatedly in the last 200 years. This CD-ROM contains 97 digitized color 35-mm images which represent a small fraction of thousands of photographs taken by Alaska Volcano Observatory scientists, other researchers, and private citizens. The photographs were selected to portray Alaska's volcanoes, to document
Authors
Christina A. Neal, Robert G. McGimsey, Michael F. Diggles
hypoDD-A Program to Compute Double-Difference Hypocenter Locations
HypoDD is a Fortran computer program package for relocating earthquakes with the double-difference algorithm of Waldhauser and Ellsworth (2000). This document provides a brief introduction into how to run and use the programs ph2dt and hypoDD to compute double-difference (DD) hypocenter locations. It gives a short overview of the DD technique, discusses the data preprocessing using ph2dt, and lead
Authors
Felix Waldhauser
A preliminary finite-element analysis of a shallow landslide in the Alki area of Seattle, Washington
No abstract available.
Authors
S. Debray, W. Z. Savage
Monterey Bay marine sanctuary geological processes and framework
No abstract available.
Authors
Michael E. Field
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, USA, Nationa
Authors
Gerald F. Wieczorek, Harry McWreath, Clay Davenport