M3.8 Earthquake 224 km ESE of Atka, Alaska — August 16, 2020
2020-08-16 22:04:36 UTC (2020-08-16) · approx. 11:04 AM UTC-11 local
On August 16, 2020 at 22:04 UTC, a magnitude 3.8 shallow crustal earthquake struck 224 km ESE of Atka, Alaska, at a depth of 10.0 km and coordinates 51.4773°, -171.1536°.
Physical scale: An earthquake of magnitude 3.8 releases seismic energy equivalent to roughly 7.6 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 252 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-171.1536°E
Technical Information
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Common Questions
How strong was the magnitude 3.8 earthquake near Atka, Alaska?
The magnitude 3.8 earthquake that struck 224 km ESE of Atka, Alaska on August 16, 2020 at 22:04 UTC had a depth of 10.0 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 3.8 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.8 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us6000bibj). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, August 16, 2020). M3.8 Earthquake 224 km ESE of Atka, Alaska — August 16, 2020. Retrieved October 24, 2020 from https://www.earthquaketracker.org/earthquakes/event/us6000bibj/