Landslides
USGS + NWS · Updated Daily · Source: USGS + NWS
About Landslides
Landslides, including debris flows, rockfalls, and slumps, occur in all 50 states and cause an estimated $3.5 billion in damages and 25–50 deaths annually in the US. They are triggered by rainfall, snowmelt, earthquakes, volcanic eruptions, and human modification of slopes. The Appalachians, Cascades, Rockies, and coastal ranges have the highest natural landslide susceptibility.
Data Source
Landslide susceptibility data is derived from the USGS National Landslide Hazards Program products, based on slope-unit modeling using NLCD land cover, SSURGO soils, and 1/3 arc-second elevation data. Event-based debris flow warnings come from the NWS api.weather.gov alerts feed, filtering for FFW (Flash Flood Warning) products with debris flow statements and dedicated SMW (Special Marine Warning) landslide mentions.
| Detail | Value |
|---|---|
| Provider | USGS Landslide Hazards Program and NOAA National Weather Service |
| Update Frequency | Daily |
| Coverage | United States (all 50 states and territories) |
| API / Data Feed | landslides.usgs.gov and api.weather.gov |
What the Map Shows
USGS landslide susceptibility zones showing areas with high and very high landslide potential based on geology, slope angle, and soil type. Active NWS debris flow warnings and flash flood statements (which often indicate debris flow conditions) are overlaid to highlight areas where triggering conditions are currently present.
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