M3.3 Earthquake 43 km WNW of Akhiok, Alaska — May 27, 2021
2021-05-27 22:51:54 UTC (2021-05-27) · approx. 12:51 PM UTC-10 local
On May 27, 2021 at 22:51 UTC, a magnitude 3.3 shallow crustal earthquake struck 43 km WNW of Akhiok, Alaska, at a depth of 63.0 km and coordinates 57.1325°, -154.8047°.
Physical scale: An earthquake of magnitude 3.3 releases seismic energy equivalent to roughly 1.3 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 114 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-154.8047°E
Technical Information
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Common Questions
How strong was the magnitude 3.3 earthquake near Akhiok, Alaska?
The magnitude 3.3 earthquake that struck 43 km WNW of Akhiok, Alaska on May 27, 2021 at 22:51 UTC had a depth of 63.0 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 3.3 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.3 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak0216rhelnu). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, May 27, 2021). M3.3 Earthquake 43 km WNW of Akhiok, Alaska — May 27, 2021. Retrieved July 31, 2021 from https://www.earthquaketracker.org/earthquakes/event/ak0216rhelnu/