Publications
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The Loma Prieta, California, earthquake of October 17, 1989: Preseismic observations The Loma Prieta, California, earthquake of October 17, 1989: Preseismic observations
The October 17, 1989, Loma Prieta, Calif., Ms=7.1 earthquake provided the first opportunity in the history of fault monitoring in the United States to gather multidisciplinary preearthquake data in the near field of an M=7 earthquake. The data obtained include observations on seismicity, continuous strain, long-term ground displacement, magnetic field, and hydrology. The papers in this...
Authors
Malcolm J. S. Johnston, Jean A. Olson, David P. Hill, Anthony C. Fraser-Smith, Arman Bernardi, Robert A. Helliwell, Paul R. McGill, O.G. Villard, Robert J. Mueller, Randall A. White, William L. Ellsworth, Evelyn A. Roeloffs, Alan T. Linde, M. T. Gladwin, R. L. Gwyther, R.H.G. Hart, Michael Lisowski, James C. Savage, William H. Prescott, Jerry L. Svarc, Mark Hunter Murray, P.G. Silver, N. J. Valette-Silver, Olga Kolbek
Age and origin of fluvial terraces in the central Coast Range, western Oregon Age and origin of fluvial terraces in the central Coast Range, western Oregon
No abstract available.
Authors
Stephen F. Personius
Landslide hazards in Vermont Landslide hazards in Vermont
No abstract available.
Authors
Charles A. Baskerville, Fitzhugh T. Lee, Charles A. Ratte
Mapping debris-flow hazard in Honolulu using a DEM Mapping debris-flow hazard in Honolulu using a DEM
A method for mapping hazard posed by debris flows has been developed and applied to an area near Honolulu, Hawaii. The method uses studies of past debris flows to characterize sites of initiation, volume at initiation, and volume-change behavior during flow. Digital simulations of debris flows based on these characteristics are then routed through a digital elevation model (DEM) to...
Authors
Stephen D. Ellen, Robert K. Mark
Directions of the US Geological Survey Landslide Hazards Reduction Program Directions of the US Geological Survey Landslide Hazards Reduction Program
The US Geological Survey (USGS) Landslide Hazards Reduction Program includes studies of landslide process and prediction, landslide susceptibility and risk mapping, landslide recurrence and slope evolution, and research application and technology transfer. Studies of landslide processes have been recently conducted in Virginia, Utah, California, Alaska, and Hawaii, Landslide...
Authors
G. F. Wieczorek
Instrumental shaking thresholds for seismically induced landslides and preliminary report on landslides triggered by the October 17, 1989, Loma Prieta, California earthquake Instrumental shaking thresholds for seismically induced landslides and preliminary report on landslides triggered by the October 17, 1989, Loma Prieta, California earthquake
The generation of seismically induced landslide depends on the characteristics of shaking as well as mechanical properties of geologic materials. A very important parameter in the study of seismically induced landslide is the intensity based on a strong-motion accelerogram: it is defined as Arias intensity and is proportional to the duration of the shaking record as well as the amplitude...
Authors
E. L. Harp
A rainfall intensity-duration threshold for landslides in a humid- tropical environment, Puerto Rico A rainfall intensity-duration threshold for landslides in a humid- tropical environment, Puerto Rico
Landslides are triggered by factors such as heavy rainfall, seismic activity, and construction on hillslopes. The leading cause of landslides in Puerto Rico is intense and/or prolonged rainfall. A rainfall threshold for rainfall-triggered landsliding is delimited by 256 storms that occurred between 1959 and 1991 in the central mountains of Puerto Rico, where mean annual rainfall is close...
Authors
M. C. Larsen, A. Simon
Maps of major active faults, Western Hemisphere, International Lithosphere Program (ILP), Project II-2; guidelines for U.S. database and map, June 1993 Maps of major active faults, Western Hemisphere, International Lithosphere Program (ILP), Project II-2; guidelines for U.S. database and map, June 1993
No abstract available.
Authors
K. M. Haller, M. N. Machette, R. L. Dart
Map of debris-flow hazard in the Honolulu District of Oahu, Hawaii Map of debris-flow hazard in the Honolulu District of Oahu, Hawaii
No abstract available.
Authors
Stephen D. Ellen, Robert K. Mark, Susan H. Cannon, Donna L. Knifong
Antarctic glacier-tongue velocities from Landsat images: First results Antarctic glacier-tongue velocities from Landsat images: First results
We measured the velocities of six glacier tongues and a few tongues within ice shelves distributed around the Antarctic coastline by determining the displacement of crevasse patterns seen on sequential Landsat images. The velocities range from less than 0.2 km a−1 for East Antarctic ice-shelf tongues to more than 2.5 km a−1 for the Thwaites Glacier Tongue. All glacier tongues show...
Authors
Baerbel K. Lucchitta, K.F. Mullins, A.L. Allison, Jane G. Ferrigno
Volcanic gases create air pollution on the Island of Hawai’i Volcanic gases create air pollution on the Island of Hawai’i
In a handful of molten magma weighing about a pound, there is less than a tenth of an ounce, by weight, of idssolved gas-roughly the same weight as a pinch of table salt. Yet this tiny amount of gas produces spectacular lava foundations hundreds of meters high (see accompanying photograph). The fountain occurs as magma reaches the surface, because dissolved volcanic gases exolve and...
Authors
J. Sutton, T. Elias