M4.2 Earthquake 8 km NNE of Old Harbor, Alaska — April 23, 2026
2026-04-23 07:12:55 UTC (3 hours ago)
Felt by 33 people across nearby locations.
On April 23, 2026 at 07:12 UTC, a magnitude 4.2 shallow crustal earthquake struck 8 km NNE of Old Harbor, Alaska, at a depth of 39.3 km and coordinates 57.2750°, -153.2600°. The earthquake was reported felt by 33 peopleacross nearby locations, with a maximum shaking intensity of Modified Mercalli Intensity (MMI) 3.5 (light). This earthquake was detected by 203 seismic stations with good location accuracy and was assigned a USGS significance rating of 284, 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
-153.2600°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.2 earthquake near Old Harbor, Alaska?
The magnitude 4.2 earthquake that struck 8 km NNE of Old Harbor, Alaska on April 23, 2026 at 07:12 UTC had a depth of 39.3 km. It was felt by 33 people with maximum shaking intensity of MMI 3.5 (light). For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 57.2750°, -153.2600°, which is 8 km NNE of Old Harbor, Alaska. View all earthquakes in Alaska.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.2 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 4.2 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.