Special Report

50 Most Dangerous Volcanoes in America

Thomas C. Frohlich

Source: WolfmanSF / Wikimedia Commons

10. Crater Lake, Oregon
> Threat score: 161
> Last eruption year: 2850 B.C.
> Pop. within 30 km: 366
> Pop. within 100 km: 272,674

Source: Jamey Jones U.S. Geological Survey / Wikimedia Commons

9. Redoubt, Alaska
> Threat score: 164
> Last eruption year: 2009
> Pop. within 30 km: 1
> Pop. within 100 km: 32,410

Source: Brocken Inaglory / Wikimedia Commons

8. Mauna Loa, Hawaii
> Threat score: 170
> Last eruption year: 1984
> Pop. within 30 km: 1,906
> Pop. within 100 km: 175,315

Source: James St. John / Flickr

7. Lassen Volcanic Center, California
> Threat score: 186
> Last eruption year: 1917
> Pop. within 30 km: 2,340
> Pop. within 100 km: 439,135

Source: Oregon State University

6. Three sisters, Oregon
> Threat score: 194
> Last eruption year: 440
> Pop. within 30 km: 5,672
> Pop. within 100 km: 279,885