M3.1 Earthquake 68 km S of Akhiok, Alaska — October 21, 2025
2025-10-21 19:26:51 UTC (2025-10-21) · approx. 9:26 AM UTC-10 local
On October 21, 2025 at 19:26 UTC, a magnitude 3.1 shallow crustal earthquake struck 68 km S of Akhiok, Alaska, at a depth of 56.7 km and coordinates 56.3326°, -154.1442°.
Physical scale: An earthquake of magnitude 3.1 releases seismic energy equivalent to roughly 674 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 83 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-154.1442°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.1 earthquake near Akhiok, Alaska?
The magnitude 3.1 earthquake that struck 68 km S of Akhiok, Alaska on October 21, 2025 at 19:26 UTC had a depth of 56.7 km. For context, this was a minor earthquake typically detected only by instruments.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.1 earthquakes can continue for several days and gradually diminish over time.
Actions
Understanding This Data
Magnitude 3.1 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak025dijh26w). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, October 21, 2025). M3.1 Earthquake 68 km S of Akhiok, Alaska — October 21, 2025. Retrieved October 21, 2025 from https://www.earthquaketracker.org/earthquakes/event/ak025dijh26w/