The Alaska Peninsula and the Aleutian Islands have about 80 major volcanic centers that consist of one or more volcanoes. Learn More:
Alaskan volcanoes have produced one or two eruptions per year since 1900.
The largest eruption in the world in the 20th century occurred in 1912 at Novarupta on the Alaska Peninsula. An estimated 15 cubic kilometers of magma was explosively erupted during 60 hours beginning on June 6th.
USGS Volcano Observatory for information on Alaska Volcanoes.You can learn more about the AVO Webicorders at this USGS webpage.