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Map Layer Info

Landslide Incidence and Susceptibility in the Conterminous United States

What this map layer shows:

Shows where landslides have occurred and areas susceptible to future landsliding.
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Background Information
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Landslides are the downward and outward movement of earth materials on a slope. Landslides generally move by the falling, sliding, or flowing of rock and (or) soil, or by a combination of these and other less common types of movement. Causes include earthquakes, reservoir draw-downs, heavy precipitation, and floods. Landslides constitute a major geologic hazard because they occur in all 50 States, and they cause $1-2 billion in damages and more than 25 fatalities on average each year. This map layer was produced from a landslide overview map compiled by the U.S. Geological Survey National Landslide Hazards Program (NLHP). The NLHP gathers information, conducts research, responds to emergencies and disasters, and produces scientific reports and other products for a variety of users. The primary objective of the NLHP is to reduce long-term losses from landslides by improving understanding of the causes of ground failure and suggesting ways to lessen damages and loss of life.

The Landslide Incidence and Susceptibility in the Conterminous United States map layer shows areas of landslides and areas susceptible to future landsliding. Landslides are defined to include most types of gravitational mass movement such as rockfalls, debris flows, and the failure of engineered soil materials. Descriptive information includes the type of landslide, location, date, number of deaths, and damages in millions of dollars. Further information on these data are available in U.S. Geological Survey Professional Paper 1183. General information on landslide hazards is available from the USGS Landslide Hazards page.


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Landslide Incidence and Susceptibility
Geologic Hazards