There are 50 active volcanoes in Alaska, two of which blow their tops every year. But nothing compares to the 15 cubic kilometers of magma that spewed from the valcano, Novarupta in 1912.
Novarupta is a volcano that was formed in 1912, located on the Alaska Peninsula in Katmai National Park and Preserve, about 290 miles southwest of Anchorage. Formed during the largest volcanic eruption of the 20th century, Novarupta released 30 times the volume of magma of the 1980 eruption of Mount St. Helens.
Volcanoes 101 | National Geographic
About 1,500 active volcanoes can be found around the world. Learn about the major types of volcanoes, the geological process behind eruptions, and where the most destructive volcanic eruption ever witnessed occurred.