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Preliminary geomagnetic paleointensities from Long Valley Caldera, California Preliminary geomagnetic paleointensities from Long Valley Caldera, California

Paleointensities are being determined in order to characterize geomagnetic intensity variations during Quaternary time. Because the geomagnetic field acts as a shield against cosmic radiation, its intensity directly affects the production rate of radiocarbon (^C) in the upper atmosphere. Coe and others (1978) showed that the variation in dipole moment during Holocene time is nearly...
Authors
Edward A. Mankinen

The importance of earthquake-induced landslides to long-term slope erosion and slope-failure hazards in seismically active regions The importance of earthquake-induced landslides to long-term slope erosion and slope-failure hazards in seismically active regions

This paper describes a general method for determining the amount of earthquake-induced landsliding that occurs in a seismically active region over time; this determination can be used as a quantitative measure of the long-term hazard from seismically triggered landslides as well as a measure of the importance of this process to regional slope-erosion rates and landscape evolution. The...
Authors
D. K. Keefer

Potential for seepage erosion of landslide dam Potential for seepage erosion of landslide dam

The failure potential of the debris-avalanche dam at Castle Lake near Mount St. Helens, Washington, by three processes of seepage erosion (1) Heave; (2) piping; and (3) internal erosion, is examined. Results indicated that the dam is stable against piping but potentially locally unstable against heave. -from Authors
Authors
W. Meyer, R. L. Schuster, M. A. Sabol

Landslides in colluvium Landslides in colluvium

No abstract available.
Authors
Robert W. Fleming, Arvid M. Johnson

Klamath Falls earthquakes, September 20, 1993 — Including the strongest quake ever measured in Oregon Klamath Falls earthquakes, September 20, 1993 — Including the strongest quake ever measured in Oregon

Earthquakes struck the Klamath Falls area on Monday night, September 20, 1993, resulting in two deaths and extensive damage. The quakes were felt as far away as Coos Bay to the west, Eugene to the north, Lakeview to the east, and Chico, California, to the south. A foreshock recorded at 8:16 p.m. had a Richter magnitude of 3.9. The first of two main shocks, measuring 5.9 on the Richter...
Authors
T. J. Wiley, David R. Sherrod, David K. Keefer, Anthony Qamar, Robert L. Schuster, James W. Dewey, Matthew A. Mabey, Gerald L. Black, Ray E. Wells

Landslides triggered by the storm of November 3-5, 1985, Wills Mountain Anticline, West Virginia and Virginia Landslides triggered by the storm of November 3-5, 1985, Wills Mountain Anticline, West Virginia and Virginia

More than 3,000 landslides were triggered by heavy rainfall in the central Appalachian Mountains of West Virginia and Virginia, November 3-5, 1985. These landslides provided the opportunity to study spatial controls on landslides, magnitude and frequency of triggering events, and the effects of landslides on flood-induced geomorphic change. The study area consists of parts of the Wills...
Authors
Robert B. Jacobson, John P. McGeehin, Elizabeth D. Cron, Carolyn E. Carr, John M. Harper, Alan D. Howard
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