ANCHORAGE, Alaska (AP) -- Two significant earthquakes shook Alaska's seismically active Aleutian Islands, but there were no immediate reports of any damages or injuries.
The magnitude-5.9 and 6.1 quakes struck about one minute apart starting at 9:23 p.m. on Thursday. Both were centered about 100 miles west of Adak in the island chain, according to a preliminary report by the U.S. Geological Survey.
"There were two tonight and that was very unusual," said geophysicist Paul Huang of the West Coast and Alaska Tsunami Warning Center. "We're going to study this a little more closely."
Huang said there was no tsunami warning expected.
On Tuesday, a magnitude-7.2 quake hit the chain about 125 miles west of Adak.
The Aleutian Islands are a chain of more than 300 islands that extend southwestward from Alaska into the northern Pacific Ocean.
The earth's most active seismic feature, the circum-Pacific seismic belt, brushes Alaska and the Aleutian Islands, where more earthquakes occur than in the other 49 States combined.
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