M3.7 Earthquake 133 km SSE of Perryville, Alaska — November 23, 2020
2020-11-23 22:53:22 UTC (2020-11-23) · approx. 11:53 AM UTC-11 local
On November 23, 2020 at 22:53 UTC, a magnitude 3.7 shallow crustal earthquake struck 133 km SSE of Perryville, Alaska, at a depth of 37.7 km and coordinates 54.8295°, -158.2402°.
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
-158.2402°E
Technical Information
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Common Questions
How strong was the magnitude 3.7 earthquake near Perryville, Alaska?
The magnitude 3.7 earthquake that struck 133 km SSE of Perryville, Alaska on November 23, 2020 at 22:53 UTC had a depth of 37.7 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 3.7 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: ak020f2tos6z). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, November 23, 2020). M3.7 Earthquake 133 km SSE of Perryville, Alaska — November 23, 2020. Retrieved February 3, 2021 from https://www.earthquaketracker.org/earthquakes/event/ak020f2tos6z/