M3.3 Earthquake 275 km SE of Chiniak, Alaska — August 11, 2020
2020-08-11 22:21:52 UTC (2020-08-11) · approx. 12:21 PM UTC-10 local
On August 11, 2020 at 22:21 UTC, a magnitude 3.3 shallow crustal earthquake struck 275 km SE of Chiniak, Alaska, at a depth of 10.0 km and coordinates 56.1096°, -148.6904°.
Physical scale: An earthquake of magnitude 3.3 releases seismic energy equivalent to roughly 1.3 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 114 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-148.6904°E
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Common Questions
How strong was the magnitude 3.3 earthquake near Chiniak, Alaska?
The magnitude 3.3 earthquake that struck 275 km SE of Chiniak, Alaska on August 11, 2020 at 22:21 UTC had a depth of 10.0 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 3.3 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.3 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us6000bczn). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, August 11, 2020). M3.3 Earthquake 275 km SE of Chiniak, Alaska — August 11, 2020. Retrieved October 21, 2020 from https://www.earthquaketracker.org/earthquakes/event/us6000bczn/