M4.7 Earthquake 295 km WSW of Adak, Alaska — April 20, 2026
2026-04-20 09:54:45 UTC (4 hours ago)
On April 20, 2026 at 09:54 UTC, a magnitude 4.7 shallow crustal earthquake struck 295 km WSW of Adak, Alaska, at a depth of 43.3 km and coordinates 51.0635°, 179.3113°. This earthquake was detected by 45 seismic stations with moderate location accuracy and was assigned a USGS significance rating of 340, placing it among routine seismic activity.
The epicenter is located in Alaska, a region characterized by Pacific Plate subduction beneath the North American Plate, producing frequent megathrust and crustal earthquakes along the Aleutian arc. The nearest mapped fault system is the Aleutian megathrust. View all earthquakes in Alaska.
Learn more: Magnitude scale · Aftershock sequences
Earthquake Details
179.3113°E
Technical Information
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Common Questions
How strong was the magnitude 4.7 earthquake near Adak, Alaska?
The magnitude 4.7 earthquake that struck 295 km WSW of Adak, Alaska on April 20, 2026 at 09:54 UTC had a depth of 43.3 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 51.0635°, 179.3113°, which is 295 km WSW of Adak, Alaska. View all earthquakes in Alaska.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.7 earthquakes can continue for several days and gradually diminish over time.
Has Alaska had earthquakes this big before?
The largest recorded earthquake in Alaska was the M9.2 Great Alaska earthquake of March 27, 1964. Today's magnitude 4.7 event is significantly smaller than that historical record.
What should I do after an earthquake?
If you were in the affected area: check yourself and others for injuries, inspect your home for damage, and be prepared for aftershocks. For detailed guidance, see our earthquake safety guide and emergency planning resources.