M3.7 Earthquake 255 km W of Adak, Alaska — February 26, 2021
2021-02-26 21:28:58 UTC (2021-02-26) · approx. 9:28 AM UTC+12 local
On February 26, 2021 at 21:28 UTC, a magnitude 3.7 intermediate depth earthquake struck 255 km W of Adak, Alaska, at a depth of 82.5 km and coordinates 51.6051°, 179.6891°.
Physical scale: An earthquake of magnitude 3.7 releases seismic energy equivalent to roughly 5.4 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 215 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
179.6891°E
Technical Information
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Common Questions
How strong was the magnitude 3.7 earthquake near Adak, Alaska?
The magnitude 3.7 earthquake that struck 255 km W of Adak, Alaska on February 26, 2021 at 21:28 UTC had a depth of 82.5 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 3.7 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.7 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000dk13). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, February 26, 2021). M3.7 Earthquake 255 km W of Adak, Alaska — February 26, 2021. Retrieved May 13, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000dk13/