M4.2 Earthquake 137 km E of Atka, Alaska — March 10, 2021
2021-03-10 23:37:46 UTC (2021-03-10) · approx. 12:37 PM UTC-11 local
On March 10, 2021 at 23:37 UTC, a magnitude 4.2 intermediate depth earthquake struck 137 km E of Atka, Alaska, at a depth of 79.9 km and coordinates 52.3434°, -172.1987°.
Physical scale: An earthquake of magnitude 4.2 releases seismic energy equivalent to roughly 30 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 476 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-172.1987°E
Technical Information
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Common Questions
How strong was the magnitude 4.2 earthquake near Atka, Alaska?
The magnitude 4.2 earthquake that struck 137 km E of Atka, Alaska on March 10, 2021 at 23:37 UTC had a depth of 79.9 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.2 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.2 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000di00). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, March 10, 2021). M4.2 Earthquake 137 km E of Atka, Alaska — March 10, 2021. Retrieved May 21, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000di00/