8.2 magnitude earthquake off Alaskan peninsula, small tsunami

Alaska quake
Map of Alaska locating an 8.2-magnitude earthquake that struck late Wednesday.

An 8.2 magnitude earthquake struck off the Alaskan peninsula late Wednesday, the United States Geological Survey said, generating small waves but no major tsunami before all warnings were canceled.

The earthquake hit 56 miles (91 kilometers) southeast of the town of Perryville, the USGS said.

The quake struck at 10:15 pm Wednesday (0615 GMT Thursday). Perryville is a small village about 500 miles from Anchorage, Alaska's biggest city.

The US government's National Tsunami Warning Center immediately issued an alert for south Alaska and the Alaskan peninsula but canceled all warnings about three hours later.

The maximum wave height detected by the center was eight inches (21 centimeters) above tide level with small tsunamis hitting at least six points off Alaska's coastline.

Tsunami warning sirens had been broadcast across Kodiak, an island with a population of about 6,000 people, along Alaska's coastline. Locals living close to sea level were told to evacuate to higher ground.

Small waves hit the coast of Kodiak, according to a broadcaster on local radio station KMXT. She said authorities had lifted evacuation orders, with no reports of any damage.

"This is the largest earthquake to happen in the Alaska region since 1965," Michael West, state seismologist with the Alaska Earthquake Center, told Alaska Public Media.

Alaska is part of the seismically active Pacific Ring of Fire.

The state was hit by a 9.2-magnitude earthquake in March 1964, the strongest ever recorded in North America.

It devastated Anchorage and unleashed a tsunami that slammed the Gulf of Alaska, the US west coast, and Hawaii.

More than 250 people were killed by the quake and the tsunami.

A 7.5 magnitude earthquake also caused tsunami waves in Alaska's southern coast in October, but no casualties were reported.


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Citation: 8.2 magnitude earthquake off Alaskan peninsula, small tsunami (2021, July 29) retrieved 27 September 2021 from https://phys.org/news/2021-07-magnitude-earthquake-alaskan-peninsula-tsunami.html
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