The world's largest volcanic eruption in over 100 years occurred June 6-8, 1912 in what is now Katmai National Park in Southwest Alaska. The Novarupta-Katmai eruption of 1912 was 30 times larger than Mt. St. Helen's 1980 blast. In 2012, 100 years after the eruption, I had a piece of the Novarupta lava dome (in … Continue reading Age Calibration of the Ar/Ar method against Novarupta