M3.4 Earthquake 109 km ESE of Akutan, Alaska — July 27, 2021
2021-07-27 20:20:22 UTC (2021-07-27) · approx. 9:20 AM UTC-11 local
On July 27, 2021 at 20:20 UTC, a magnitude 3.4 shallow crustal earthquake struck 109 km ESE of Akutan, Alaska, at a depth of 21.9 km and coordinates 53.6568°, -164.3229°.
Physical scale: An earthquake of magnitude 3.4 releases seismic energy equivalent to roughly 1.9 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 134 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-164.3229°E
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Common Questions
How strong was the magnitude 3.4 earthquake near Akutan, Alaska?
The magnitude 3.4 earthquake that struck 109 km ESE of Akutan, Alaska on July 27, 2021 at 20:20 UTC had a depth of 21.9 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 3.4 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.4 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us6000ezlx). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, July 27, 2021). M3.4 Earthquake 109 km ESE of Akutan, Alaska — July 27, 2021. Retrieved October 3, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000ezlx/