M3.2 Earthquake 129 km S of Unalaska, Alaska — October 18, 2020
2020-10-18 21:22:45 UTC (2020-10-18) · approx. 10:22 AM UTC-11 local
On October 18, 2020 at 21:22 UTC, a magnitude 3.2 shallow crustal earthquake struck 129 km S of Unalaska, Alaska, at a depth of 29.7 km and coordinates 52.7153°, -166.7272°.
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
-166.7272°E
Technical Information
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Common Questions
How strong was the magnitude 3.2 earthquake near Unalaska, Alaska?
The magnitude 3.2 earthquake that struck 129 km S of Unalaska, Alaska on October 18, 2020 at 21:22 UTC had a depth of 29.7 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: us7000c848). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, October 18, 2020). M3.2 Earthquake 129 km S of Unalaska, Alaska — October 18, 2020. Retrieved December 29, 2020 from https://www.earthquaketracker.org/earthquakes/event/us7000c848/