M3.9 Earthquake 123 km WSW of Nikolski, Alaska — February 28, 2025
2025-02-28 19:48:01 UTC (2025-02-28) · approx. 8:48 AM UTC-11 local
On February 28, 2025 at 19:48 UTC, a magnitude 3.9 shallow crustal earthquake struck 123 km WSW of Nikolski, Alaska, at a depth of 49.1 km and coordinates 52.3792°, -170.4303°.
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
-170.4303°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 123 km WSW of Nikolski, Alaska on February 28, 2025 at 19:48 UTC had a depth of 49.1 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: us6000pw6g). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, February 28, 2025). M3.9 Earthquake 123 km WSW of Nikolski, Alaska — February 28, 2025. Retrieved May 8, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000pw6g/