Hillside with a covering and various bulldozers and other heavy equipment after landslide on the hillside.

Landslide

A Landslide is the movement of a mass of rock, debris, or earth down a slope.

In the National Risk Index, a Landslide Risk Index score and rating represent a community's relative risk for Landslides when compared to the rest of the United States. A Landslide Expected Annual Loss score and rating represent a community's relative level of expected building and population loss each year due to Landslides when compared to the rest of the United States.

A map of the United States colored by Landslide Risk Index ratings. Landslide risk is possible and prevalent across the United States with concentrated risk in Oregon and Idaho. For full results, see the National Risk Index Map webpage.

Landslide Exposure

A Landslide exposure value represents a community's building value (in dollars) and population (in both people and population equivalence) exposed to Landslides.

Landslide Annualized Frequency

A Landslide annualized frequency value represents the average number of recorded Landslide hazard occurrences (events) per year over the period of record (10 years).

Landslide Historic Loss Ratio

A Landslide historic loss ratio is the representative percentage of the exposed consequence type value (building or population) expected to be lost due to a Landslide hazard occurrence.

Landslide Processing Methodology

For comprehensive details about the Landslide processing methodology, see the National Risk Index Technical Documentation.