M3.8 Earthquake 153 km S of Nikolski, Alaska — June 29, 2025
2025-06-29 23:52:30 UTC (2025-06-29) · approx. 12:52 PM UTC-11 local
On June 29, 2025 at 23:52 UTC, a magnitude 3.8 shallow crustal earthquake struck 153 km S of Nikolski, Alaska, at a depth of 10.0 km and coordinates 51.5761°, -168.5438°.
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
-168.5438°E
Technical Information
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Common Questions
How strong was the magnitude 3.8 earthquake near Nikolski, Alaska?
The magnitude 3.8 earthquake that struck 153 km S of Nikolski, Alaska on June 29, 2025 at 23:52 UTC had a depth of 10.0 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.
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Understanding This Data
Magnitude 3.8 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000q9mt). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, June 29, 2025). M3.8 Earthquake 153 km S of Nikolski, Alaska — June 29, 2025. Retrieved September 4, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000q9mt/