M3.1 Earthquake 28 km NW of Atka, Alaska — August 13, 2020
2020-08-13 20:08:48 UTC (2020-08-13) · approx. 8:08 AM UTC-12 local
On August 13, 2020 at 20:08 UTC, a magnitude 3.1 intermediate depth earthquake struck 28 km NW of Atka, Alaska, at a depth of 229.7 km and coordinates 52.3407°, -174.5464°.
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
-174.5464°E
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Common Questions
How strong was the magnitude 3.1 earthquake near Atka, Alaska?
The magnitude 3.1 earthquake that struck 28 km NW of Atka, Alaska on August 13, 2020 at 20:08 UTC had a depth of 229.7 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 3.1 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: us7000bfd8). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, August 13, 2020). M3.1 Earthquake 28 km NW of Atka, Alaska — August 13, 2020. Retrieved October 24, 2020 from https://www.earthquaketracker.org/earthquakes/event/us7000bfd8/