M3.7 Earthquake 96 km SSW of Unalaska, Alaska — December 9, 2020
2020-12-09 19:41:03 UTC (2020-12-09) · approx. 8:41 AM UTC-11 local
On December 9, 2020 at 19:41 UTC, a magnitude 3.7 shallow crustal earthquake struck 96 km SSW of Unalaska, Alaska, at a depth of 42.9 km and coordinates 53.0712°, -167.0817°.
Physical scale: An earthquake of magnitude 3.7 releases seismic energy equivalent to roughly 5.4 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 215 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-167.0817°E
Technical Information
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Common Questions
How strong was the magnitude 3.7 earthquake near Unalaska, Alaska?
The magnitude 3.7 earthquake that struck 96 km SSW of Unalaska, Alaska on December 9, 2020 at 19:41 UTC had a depth of 42.9 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 3.7 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.7 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000cr05). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, December 9, 2020). M3.7 Earthquake 96 km SSW of Unalaska, Alaska — December 9, 2020. Retrieved February 20, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000cr05/