M3.9 Earthquake 183 km SSW of Nikolski, Alaska — August 25, 2023
2023-08-25 18:03:27 UTC (2023-08-25) · approx. 7:03 AM UTC-11 local
On August 25, 2023 at 18:03 UTC, a magnitude 3.9 shallow crustal earthquake struck 183 km SSW of Nikolski, Alaska, at a depth of 10.0 km and coordinates 51.3367°, -169.5180°.
Physical scale: An earthquake of magnitude 3.9 releases seismic energy equivalent to roughly 11 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 296 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-169.5180°E
Technical Information
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Common Questions
How strong was the magnitude 3.9 earthquake near Nikolski, Alaska?
The magnitude 3.9 earthquake that struck 183 km SSW of Nikolski, Alaska on August 25, 2023 at 18:03 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 3.9 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.9 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000kuew). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, August 25, 2023). M3.9 Earthquake 183 km SSW of Nikolski, Alaska — August 25, 2023. Retrieved October 28, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000kuew/