M3.8 Earthquake 98 km SW of Adak, Alaska — September 23, 2025
2025-09-23 17:24:20 UTC (2025-09-23) · approx. 5:24 AM UTC-12 local
On September 23, 2025 at 17:24 UTC, a magnitude 3.8 shallow crustal earthquake struck 98 km SW of Adak, Alaska, at a depth of 43.3 km and coordinates 51.2337°, -177.6055°.
Physical scale: An earthquake of magnitude 3.8 releases seismic energy equivalent to roughly 7.6 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 252 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-177.6055°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.8 earthquake near Adak, Alaska?
The magnitude 3.8 earthquake that struck 98 km SW of Adak, Alaska on September 23, 2025 at 17:24 UTC had a depth of 43.3 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 3.8 earthquakes can continue for several days and gradually diminish over time.
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.
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Understanding This Data
Magnitude 3.8 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us6000rhiw). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, September 23, 2025). M3.8 Earthquake 98 km SW of Adak, Alaska — September 23, 2025. Retrieved May 28, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000rhiw/