Novarupta, meaning "new eruption",'s a volcano located on the Alaska Peninsula in Katmai National Park and Preserve, about southwest of Anchorage. Formed in 1912 during one of the largest volcanic eruptions of the 20th century, Novarupta released 30 times the volume of magma as the 1980 eruption of Mount St. Helens. Eruption of 1912 One of the largest eruptions of the 20th century occurred in 1912, from June 6 to June 8, to form Novarupta. Rated a 6 on the volcanic explosivity index, the 60 ho… (More on Novarupta)