Special Report

50 Most Dangerous Volcanoes in America

Thomas C. Frohlich

Source: National Park Service

45. Martin, Alaska
> Threat score: 75
> Last eruption year: 1953
> Pop. within 30 km: 0
> Pop. within 100 km: 914

Source: Katmai National Park and Preserve / Flickr

44. Mageik, Alaska
> Threat score: 75
> Last eruption year: 500 B.C.
> Pop. within 30 km: 0
> Pop. within 100 km: 376

Source: troutnut / iStock

43. Hayes, Alaska
> Threat score: 75
> Last eruption year: 1200
> Pop. within 30 km: 0
> Pop. within 100 km: 151

Source: R. McGimsey, U.S. Geological Survey / Wikimedia Commons

42. Griggs, Alaska
> Threat score: 75
> Last eruption year: 1790 B.C.
> Pop. within 30 km: 0
> Pop. within 100 km: 654

Source: Dick Moore, U.S. Geological Survey / Wikimedia Commons

41. Agrigan, Northern Mariana Islands
> Threat score: 77
> Last eruption year: 1917
> Pop. within 30 km: 0
> Pop. within 100 km: 0