M3.2 Earthquake 280 km ESE of Attu Station, Alaska — October 21, 2023
2023-10-21 16:44:28 UTC (2023-10-21) · approx. 4:44 AM UTC+12 local
On October 21, 2023 at 16:44 UTC, a magnitude 3.2 shallow crustal earthquake struck 280 km ESE of Attu Station, Alaska, at a depth of 66.6 km and coordinates 51.7451°, 176.8777°.
Physical scale: An earthquake of magnitude 3.2 releases seismic energy equivalent to roughly 951 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 97 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
176.8777°E
Technical Information
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Common Questions
How strong was the magnitude 3.2 earthquake near Attu Station, Alaska?
The magnitude 3.2 earthquake that struck 280 km ESE of Attu Station, Alaska on October 21, 2023 at 16:44 UTC had a depth of 66.6 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 3.2 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.2 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000l9cs). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, October 21, 2023). M3.2 Earthquake 280 km ESE of Attu Station, Alaska — October 21, 2023. Retrieved December 26, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000l9cs/