How strong was the 249 km WSW of Adak, Alaska earthquake?
Magnitude 3.9 (mb), minor – felt by people near the epicenter. Depth 9 km. Strongest estimated shaking: intensity 3.9 on the Modified Mercalli scale.
Was it felt?
No felt reports have been submitted to the USGS so far.
Were there aftershocks?
No earthquakes within 100 km have followed so far in our records.
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Source: U.S. Geological Survey (USGS) earthquake catalog, real-time feeds and FDSN event service; magnitudes and locations are revised by seismologists for hours after an event. Times are Eastern (ET) unless marked UTC. Not an alert service: for warnings follow local authorities and tsunami centers.
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M3.9 earthquake 249 km WSW of Adak, Alaska — 77.today