Supervolcanoes likely triggered externally

Supervolcanoes, massive eruptions with potential global consequences, appear not to follow the conventional volcano mechanics of internal pressure building until the volcano blows. Instead, a new study finds, such massive magma chambers might erupt when the roof above them cracks or collapses.

Knowledge of triggering mechanisms is crucial for monitoring supervolcano systems, including ones that lie beneath Yellowstone National Park and Long Valley, Calif., according to the study led by Patricia Gregg, Univ. of Illinois professor of geology, in collaboration with professor Eric Grosfils of Pomona College and professor Shan de Silva of Oregon State Univ. The study was published in the Journal of Volcanology and Geothermal Research.

Read more: http://www.rdmag.com/news/2015/11/supervolcanoes-likely-triggered-externally