Quake swarms at neighboring Alaska volcanoes raise concerns

Not one but two volcanoes on the same island in Alaska’s Aleutian chain were showing signs of unrest on Friday, rocked by seismic activity. Elevated earthquake activity at both Tanaga and Takawangha volcanoes on uninhabited Tanaga Island hundreds of miles from Anchorage could indicate a possible eruption. The Alaska Volcano Observatory says if an eruption were to occur, it's uncertain at this point which volcano it would come from. The observatory raised the alert level for both. Seismic activity diminished a bit Friday, but frequent earthquakes were reported underneath the center of each volcano and in between them. The quakes were happening about every minute or two, and some measured at magnitude 3.0.