An Alaska earthquake touched off a small tsunami and was followed by dozens of aftershocks felt in Alaska's Aleutian Islands. Originally measured as a magnitude 8.0, the earthquake has been downgraded to 7.9.
Magma from the deadly eruption of Irazú in Costa Rica decades ago, recently helped researchers better understand quickly erupting volcanos. Now scientists hope to learn more by investigating other volcanic sites.
Ash billowing from Pavlof Volcano is not high enough to affect international air travel, but Pavlof is just one of a string of active Alaska volcanoes that sits beneath the flight corridor between the US and Asia.