FYI NOVA on PBS is currently running an episode "Mystery of the Megavolcano." Here's a map of what they're calling "supereruptions" from around the world (nice

FYI NOVA on PBS is currently running an episode "Mystery of the Megavolcano." Here's a map of what they're calling "supereruptions" from around the world (nice cluster in the Western US): http://www.pbs.org/wgbh/nova/megavolcano/blasts.html http://www.pbs.org/wgbh/nova/megavolcano/blasts.html