At 22:12 local time, a magnitude 7.8 quake struck about 100 kilometres (Over 60 miles) off the Alaska coast at a depth it 28 kilometres (17 miles), initially triggering a tsunami warning for South Alaska, the Alaska Peninsula and the Aleutian Islands that sent residents moving to higher ground. The tsunami warning was called off about 2 hours after the quake without any damaging waves.
No casualties or significant damage have been reported. The United States Geological Survey (USGS) reported that over 20 aftershocks ranging from magnitudes 2.8 to 6.1 were detected after the initial quake.
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