Here are five big volcano-related questions that have been answered in the last decade by volcanologists, according to Alan Robock of the Department of Environmental Sciences at Rutgers University. He summarized them in this week's issue of Eos, a publication of the American Geophysical Union (AGU).
1) What was the largest volcanic eruption on Earth since the historic Mount Pinatubo eruption on 15 June 1991?
It depends on what you are measuring, some of the big ones were Soufrière Hills, Montserrat (May 2006), Kasatochi in Alaska's Aleutian Islands (August 2008), and Sarychev, in Russia's Kuril Islands (June 2009). But the one that launched the most climate-cooling sulfur (1.5 megatons) into the stratosphere since Pinatubo was the Nabro, Eritrea eruption in June of 2011.