The world's biggest historic landslide occurred during the 1980 eruption of Mount St. Helens, a volcano in the Cascade Mountain Range in the State of Washington, USA. The volume of material was 2.8 cubic kilometers (km).
See the list of worldwide catastrophic landslides of the 20th century.
At this time there is no collective landslide inventory for the entire United States.
Detailed locations of areas susceptible to debris flows are given on "Preliminary Soil-Slip Susceptibility Maps, Southwestern California" published as U.S.
Several kinds of maps are used to depict danger from landslides.
Under what circumstances do U.S. Geological Survey landslide personnel conduct field work in landslide prone areas?
USGS landslide researchers have ongoing field projects in several areas of the U.S., including parts of the Pacific coastal ranges, Rocky Mountains, and the Appalachians.
It’s not possible to exactly predict the number of days or weeks that landslides remain a danger after heavy rain. Residents near mountain slopes, canyons, and landslide prone areas should stay alert even after heavy rain subsides.
Wild land fires are inevitable in the western United States.
Yes. The USGS Landslide Hazards Program website has recent publications that can help you find landslide information.
The U.S. Geological Survey Landslide Information Center has a toll-free number at 1-800-654-4966, and can be reached by email at NLIC@usgs.gov.
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