M3.5 Earthquake 249 km ESE of Attu Station, Alaska — March 11, 2025
2025-03-11 22:36:46 UTC (2025-03-11) · approx. 10:36 AM UTC+12 local
On March 11, 2025 at 22:36 UTC, a magnitude 3.5 shallow crustal earthquake struck 249 km ESE of Attu Station, Alaska, at a depth of 35.0 km and coordinates 51.8219°, 176.4382°.
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
176.4382°E
Technical Information
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Common Questions
How strong was the magnitude 3.5 earthquake near Attu Station, Alaska?
The magnitude 3.5 earthquake that struck 249 km ESE of Attu Station, Alaska on March 11, 2025 at 22:36 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: us6000q5wa). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, March 11, 2025). M3.5 Earthquake 249 km ESE of Attu Station, Alaska — March 11, 2025. Retrieved May 16, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000q5wa/