M3.1 Earthquake 71 km S of Unalaska, Alaska — October 11, 2022
2022-10-11 23:46:11 UTC (2022-10-11) · approx. 12:46 PM UTC-11 local
On October 11, 2022 at 23:46 UTC, a magnitude 3.1 shallow crustal earthquake struck 71 km S of Unalaska, Alaska, at a depth of 45.8 km and coordinates 53.2362°, -166.4343°.
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
-166.4343°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake near Unalaska, Alaska?
The magnitude 3.1 earthquake that struck 71 km S of Unalaska, Alaska on October 11, 2022 at 23:46 UTC had a depth of 45.8 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: us7000ilvh). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, October 11, 2022). M3.1 Earthquake 71 km S of Unalaska, Alaska — October 11, 2022. Retrieved December 17, 2022 from https://www.earthquaketracker.org/earthquakes/event/us7000ilvh/