M3.1 Earthquake 240 km SE of Attu Station, Alaska — October 29, 2022
2022-10-29 20:36:19 UTC (2022-10-29) · approx. 8:36 AM UTC+12 local
On October 29, 2022 at 20:36 UTC, a magnitude 3.1 shallow crustal earthquake struck 240 km SE of Attu Station, Alaska, at a depth of 35.0 km and coordinates 51.6376°, 176.1141°.
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
176.1141°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake near Attu Station, Alaska?
The magnitude 3.1 earthquake that struck 240 km SE of Attu Station, Alaska on October 29, 2022 at 20:36 UTC had a depth of 35.0 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: us7000iq18). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, October 29, 2022). M3.1 Earthquake 240 km SE of Attu Station, Alaska — October 29, 2022. Retrieved January 12, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000iq18/