M3.1 Earthquake 162 km SSW of Atka, Alaska — August 20, 2020
2020-08-20 22:40:59 UTC (2020-08-20) · approx. 10:40 AM UTC-12 local
On August 20, 2020 at 22:40 UTC, a magnitude 3.1 shallow crustal earthquake struck 162 km SSW of Atka, Alaska, at a depth of 24.6 km and coordinates 50.8024°, -174.9172°.
Physical scale: An earthquake of magnitude 3.1 releases seismic energy equivalent to roughly 674 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 83 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-174.9172°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake near Atka, Alaska?
The magnitude 3.1 earthquake that struck 162 km SSW of Atka, Alaska on August 20, 2020 at 22:40 UTC had a depth of 24.6 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 3.1 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.1 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000bksz). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, August 20, 2020). M3.1 Earthquake 162 km SSW of Atka, Alaska — August 20, 2020. Retrieved October 31, 2020 from https://www.earthquaketracker.org/earthquakes/event/us7000bksz/