M3.6 Earthquake 33 km SSW of Atka, Alaska — October 6, 2021
2021-10-06 19:09:09 UTC (2021-10-06) · approx. 7:09 AM UTC-12 local
On October 6, 2021 at 19:09 UTC, a magnitude 3.6 intermediate depth earthquake struck 33 km SSW of Atka, Alaska, at a depth of 75.0 km and coordinates 51.9017°, -174.2964°.
Physical scale: An earthquake of magnitude 3.6 releases seismic energy equivalent to roughly 3.8 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 184 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-174.2964°E
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Common Questions
How strong was the magnitude 3.6 earthquake near Atka, Alaska?
The magnitude 3.6 earthquake that struck 33 km SSW of Atka, Alaska on October 6, 2021 at 19:09 UTC had a depth of 75.0 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 3.6 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.6 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000frja). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, October 6, 2021). M3.6 Earthquake 33 km SSW of Atka, Alaska — October 6, 2021. Retrieved December 10, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000frja/