M3.1 Earthquake 80 km WSW of Adak, Alaska — May 21, 2026
2026-05-21 22:01:21 UTC (2026-05-21) · approx. 10:01 AM UTC-12 local
On May 21, 2026 at 22:01 UTC, a magnitude 3.1 intermediate depth earthquake struck 80 km WSW of Adak, Alaska, at a depth of 81.6 km and coordinates 51.6554°, -177.7383°.
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
-177.7383°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake near Adak, Alaska?
The magnitude 3.1 earthquake that struck 80 km WSW of Adak, Alaska on May 21, 2026 at 22:01 UTC had a depth of 81.6 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: us6000szma). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, May 21, 2026). M3.1 Earthquake 80 km WSW of Adak, Alaska — May 21, 2026. Retrieved June 8, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000szma/