M3.1 Earthquake 48 km S of Unalaska, Alaska — March 14, 2021
2021-03-14 17:40:07 UTC (2021-03-14) · approx. 6:40 AM UTC-11 local
On March 14, 2021 at 17:40 UTC, a magnitude 3.1 shallow crustal earthquake struck 48 km S of Unalaska, Alaska, at a depth of 67.2 km and coordinates 53.4487°, -166.6629°.
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
-166.6629°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake near Unalaska, Alaska?
The magnitude 3.1 earthquake that struck 48 km S of Unalaska, Alaska on March 14, 2021 at 17:40 UTC had a depth of 67.2 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: us6000dyp2). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, March 14, 2021). M3.1 Earthquake 48 km S of Unalaska, Alaska — March 14, 2021. Retrieved May 26, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000dyp2/