M3.5 Earthquake 88 km SW of Atka, Alaska — March 21, 2025
2025-03-21 21:58:22 UTC (2025-03-21) · approx. 9:58 AM UTC-12 local
On March 21, 2025 at 21:58 UTC, a magnitude 3.5 shallow crustal earthquake struck 88 km SW of Atka, Alaska, at a depth of 35.0 km and coordinates 51.6803°, -175.1727°.
Physical scale: An earthquake of magnitude 3.5 releases seismic energy equivalent to roughly 2.7 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 157 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-175.1727°E
Technical Information
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Common Questions
How strong was the magnitude 3.5 earthquake near Atka, Alaska?
The magnitude 3.5 earthquake that struck 88 km SW of Atka, Alaska on March 21, 2025 at 21:58 UTC had a depth of 35.0 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 3.5 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.5 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000pmb5). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, March 21, 2025). M3.5 Earthquake 88 km SW of Atka, Alaska — March 21, 2025. Retrieved May 29, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000pmb5/