M3.1 Earthquake 113 km SE of Ugashik, Alaska — July 13, 2025
2025-07-13 23:13:11 UTC (2025-07-13) · approx. 1:13 PM UTC-10 local
On July 13, 2025 at 23:13 UTC, a magnitude 3.1 shallow crustal earthquake struck 113 km SE of Ugashik, Alaska, at a depth of 64.4 km and coordinates 56.7348°, -156.1842°.
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
-156.1842°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake near Ugashik, Alaska?
The magnitude 3.1 earthquake that struck 113 km SE of Ugashik, Alaska on July 13, 2025 at 23:13 UTC had a depth of 64.4 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.
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Understanding This Data
Magnitude 3.1 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak0258x813xy). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, July 13, 2025). M3.1 Earthquake 113 km SE of Ugashik, Alaska — July 13, 2025. Retrieved September 20, 2025 from https://www.earthquaketracker.org/earthquakes/event/ak0258x813xy/