Special Report

50 Most Dangerous Volcanoes in America

Thomas C. Frohlich

Source: NOAA / Wikimedia Commons

40. Anatahan, Northern Mariana Islands
> Threat score: 81
> Last eruption year: 2008
> Pop. within 30 km: 0
> Pop. within 100 km: 0

Source: USGS - McGimsey R.G. / Wikimedia Commons

39. Gareloi, Alaska
> Threat score: 82
> Last eruption year: 1989
> Pop. within 30 km: 0
> Pop. within 100 km: 0

Source: U.S. Geological Survey

38. Churchill, Alaska
> Threat score: 83
> Last eruption year: 847
> Pop. within 30 km: 0
> Pop. within 100 km: 95

Source: Katmai National Park and Preserve / Flickr

37. Aniakchak, Alaska
> Threat score: 88
> Last eruption year: 1931
> Pop. within 30 km: 36
> Pop. within 100 km: 479

Source: Michael Overstreet / iStock

36. Clear Lake, California
> Threat score: 89
> Last eruption year: 8000 B.C.
> Pop. of Soda Bay, the closest town: 1,495