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Alaska earthquake measuring 7.5 triggers tsunami warning JUNEAU, Alaska -- A reported 7.5 magnitude earthquake off the Alaska Peninsula on Monday prompted tsunami warnings for a vast swath of communities, leading some schools to evacuate and send students to higher ground. The size of the quake was originally reported to have been a magnitude of 7.4, but has been revised to a 7.5, said Paul Caruso, a geophysicist with the U.S. Geological Survey. He said an earthquake of this size, in this area, is not a surprise. "This is an area where the Pacific Plate is subducting underneath the North American Plate. And because of that, the Pacific Plate actually goes underneath the North American Plate, where it melts," Caruso said, noting that's why there are volcanoes in the region. "And so we commonly have large, magnitude 7 earthquakes in that area." Public safety officials in King Cove sent out an alert urging residents in the coastal area to move inland to higher grou...