Special Report

50 Most Dangerous Volcanoes in America

Thomas C. Frohlich

Source: Paxson Woelber / Flickr

35. Trident, Alaska
> Threat score: 90
> Last eruption year: 1974
> Pop. within 30 km: 0
> Pop. within 100 km: 117

Source: NOAA

34. Katmai, Alaska
> Threat score: 90
> Last eruption year: 1912
> Pop. within 30 km: 0
> Pop. within 100 km: 128

Source: Ted Bank Jr / Three Lions / Hulton Archive / Getty Images

33. Great Sitkin, Alaska
> Threat score: 90
> Last eruption year: 1974
> Pop. within 30 km: 0
> Pop. within 100 km: 0

Source: NASA's Earth Observatory / Wikimedia Commons

32. Pagan, Northern Mariana Islands
> Threat score: 91
> Last eruption year: 2012
> Pop. within 30 km: 0
> Pop. within 100 km: 0

Source: Tina Power / Getty Images

31. Hualalai, Hawaii
> Threat score: 92
> Last eruption year: 1801
> Pop. within 30 km: 46,959
> Pop. within 100 km: 166,240