M3.1 Earthquake 60 km SSW of Atka, Alaska — August 10, 2021
2021-08-10 23:40:31 UTC (2021-08-10) · approx. 11:40 AM UTC-12 local
On August 10, 2021 at 23:40 UTC, a magnitude 3.1 intermediate depth earthquake struck 60 km SSW of Atka, Alaska, at a depth of 224.2 km and coordinates 51.7095°, -174.5952°.
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
-174.5952°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 60 km SSW of Atka, Alaska on August 10, 2021 at 23:40 UTC had a depth of 224.2 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: us6000f8gw). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, August 10, 2021). M3.1 Earthquake 60 km SSW of Atka, Alaska — August 10, 2021. Retrieved October 23, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000f8gw/