M4.1 Earthquake 123 km SSW of Attu Station, Alaska — October 8, 2022
2022-10-08 14:23:29 UTC (2022-10-08) · approx. 1:23 AM UTC+11 local
On October 8, 2022 at 14:23 UTC, a magnitude 4.1 shallow crustal earthquake struck 123 km SSW of Attu Station, Alaska, at a depth of 10.0 km and coordinates 51.9132°, 172.2166°.
Physical scale: An earthquake of magnitude 4.1 releases seismic energy equivalent to roughly 21 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 406 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
172.2166°E
Technical Information
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Common Questions
How strong was the magnitude 4.1 earthquake near Attu Station, Alaska?
The magnitude 4.1 earthquake that struck 123 km SSW of Attu Station, Alaska on October 8, 2022 at 14:23 UTC had a depth of 10.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.1 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.1 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000itct). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, October 8, 2022). M4.1 Earthquake 123 km SSW of Attu Station, Alaska — October 8, 2022. Retrieved December 17, 2022 from https://www.earthquaketracker.org/earthquakes/event/us6000itct/