A powerful magnitude 7.9 earthquake struck off the coast of Alaska today, prompting officials to issue a tsunami warning for the state's coastal regions. The warning was later downgraded to an advisory.
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The quake, which shook an area about 15 miles from Little Sitkin Island, was initially deemed a 7.1 on the Richter scale before it was upgraded to an 7.9.
Tsunami waves in Unalaska and Saint Paul, Alaska, were expected to be under a foot tall, the the National Weather Service advisory said. Waves had already reached other locations in Alaska, none higher than a foot.
Widespread inundation was no longer expected in advisory areas, according to the National Tsunami Warning Center.
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