M3.1 Earthquake 147 km S of False Pass, Alaska — May 21, 2023
2023-05-21 22:32:07 UTC (2023-05-21) · approx. 11:32 AM UTC-11 local
On May 21, 2023 at 22:32 UTC, a magnitude 3.1 shallow crustal earthquake struck 147 km S of False Pass, Alaska, at a depth of 31.0 km and coordinates 53.5279°, -163.5627°.
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
-163.5627°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake near False Pass, Alaska?
The magnitude 3.1 earthquake that struck 147 km S of False Pass, Alaska on May 21, 2023 at 22:32 UTC had a depth of 31.0 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 3.1 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: us7000k41t). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, May 21, 2023). M3.1 Earthquake 147 km S of False Pass, Alaska — May 21, 2023. Retrieved July 29, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000k41t/