M3.2 Earthquake 40 km WSW of Petersville, Alaska — December 8, 2020
2020-12-08 22:33:19 UTC (2020-12-08) · approx. 12:33 PM UTC-10 local
On December 8, 2020 at 22:33 UTC, a magnitude 3.2 intermediate depth earthquake struck 40 km WSW of Petersville, Alaska, at a depth of 96.6 km and coordinates 62.3659°, -151.4986°.
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
-151.4986°E
Technical Information
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Common Questions
How strong was the magnitude 3.2 earthquake near Petersville, Alaska?
The magnitude 3.2 earthquake that struck 40 km WSW of Petersville, Alaska on December 8, 2020 at 22:33 UTC had a depth of 96.6 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: ak020frmmoq3). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, December 8, 2020). M3.2 Earthquake 40 km WSW of Petersville, Alaska — December 8, 2020. Retrieved February 12, 2021 from https://www.earthquaketracker.org/earthquakes/event/ak020frmmoq3/