Special Report

50 Most Dangerous Volcanoes in America

Thomas C. Frohlich

Source: fdastudillo / Getty Images

30. Medicine Lake, California
> Threat score: 92
> Last eruption year: 1060
> Pop. within 30 km: 254
> Pop. within 100 km: 120,685

Source: M.E.. Yount, U.S. Geological Survey / Wikimedia Commons

29. Ugashik-Peulik, Alaska
> Threat score: 93
> Last eruption year: 1814
> Pop. within 30 km: 0
> Pop. within 100 km: 102

Source: Brandon Wilson / AVO / NASA Goddard Space Flight Center / Flickr

28. Pavlof, Alaska
> Threat score: 95
> Last eruption year: 2016
> Pop. within 30 km: 0
> Pop. within 100 km: 3,002

Source: SashaBuzko / iStock

27. Mono Craters, California
> Threat score: 98
> Last eruption year: 1380
> Pop. within 30 km: 9,048
> Pop. within 100 km: 82,160

Source: brewbooks / Flickr

26. Wrangell, Alaska
> Threat score: 100
> Last eruption year: 1912
> Pop. within 30 km: 0
> Pop. within 100 km: 1,844