Torrential rain and fast-moving mudslides, a type of landslide, have shut down a Southern California town, stranding thousands of people and trapping 500 children and adults at a church camp. At least one person has been found dead.
While landslides can happen anywhere with elevated terrain, some areas of the nation are more prone to the phenomenon than others.
Regions like the Appalachian Mountains, the Rocky Mountains and the Pacific Coast all have "severe landslide problems," according to the U.S. Geological Survey.
The states of California, Oregon, Washington, Alaska and Hawaii are especially prone, according to the agency.
In fact, the USGS is currently monitoring the following sites for possible landslides because of their history and current geography:
1. Seattle area
2. Highway 50 between Placerville and South Lake Tahoe, Calif.
3. Arroyo Seco near Pasadena, Calif.
4. Chalk Cliffs near Buena Vista, Colo.
5. Jesusita Fire area near Santa Barbara, Calif.
6. Gap Fire area near Goleta, Calif.
7. Dunsmore Canyon near Glendale, Calif.
8. Devil's Punchbowl landslide in Lincoln County, Ore.