M3.0 Earthquake 126 km SSE of Old Harbor, Alaska — September 1, 2025
2025-09-01 22:40:44 UTC (2025-09-01) · approx. 12:40 PM UTC-10 local
On September 1, 2025 at 22:40 UTC, a magnitude 3.0 shallow crustal earthquake struck 126 km SSE of Old Harbor, Alaska, at a depth of 9.7 km and coordinates 56.2659°, -152.1487°.
Physical scale: An earthquake of magnitude 3.0 releases seismic energy equivalent to roughly 477 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 71 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-152.1487°E
Technical Information
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Common Questions
How strong was the magnitude 3.0 earthquake near Old Harbor, Alaska?
The magnitude 3.0 earthquake that struck 126 km SSE of Old Harbor, Alaska on September 1, 2025 at 22:40 UTC had a depth of 9.7 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 3.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.0 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak025b7wgwls). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, September 1, 2025). M3.0 Earthquake 126 km SSE of Old Harbor, Alaska — September 1, 2025. Retrieved November 19, 2025 from https://www.earthquaketracker.org/earthquakes/event/ak025b7wgwls/