M3.1 Earthquake 232 km ESE of Attu Station, Alaska — August 21, 2026
2026-08-21 01:13:27 UTC (5 hours ago) · approx. 1:13 PM UTC+12 local
On August 21, 2026 at 01:13 UTC, a magnitude 3.1 shallow crustal earthquake struck 232 km ESE of Attu Station, Alaska, at a depth of 17.8 km and coordinates 52.0030°, 176.3120°.
Physical scale: An earthquake of magnitude 3.1 releases seismic energy equivalent to roughly 674 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 83 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
176.3120°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake near Attu Station, Alaska?
The magnitude 3.1 earthquake that struck 232 km ESE of Attu Station, Alaska on August 21, 2026 at 01:13 UTC had a depth of 17.8 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 3.1 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.1 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: aka2026qmpnvs). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, August 21, 2026). M3.1 Earthquake 232 km ESE of Attu Station, Alaska — August 21, 2026. Retrieved August 21, 2026 from https://www.earthquaketracker.org/earthquakes/event/aka2026qmpnvs/