M3.1 Earthquake in the Unimak Island region, Alaska — March 28, 2021
2021-03-28 19:51:30 UTC (2021-03-28) · approx. 8:51 AM UTC-11 local
On March 28, 2021 at 19:51 UTC, a magnitude 3.1 shallow crustal earthquake struck in the Unimak Island region, Alaska, at a depth of 65.8 km and coordinates 53.6521°, -164.8161°.
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
-164.8161°E
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Common Questions
How strong was the magnitude 3.1 earthquake in the Unimak Island region, Alaska?
The magnitude 3.1 earthquake that struck in the Unimak Island region, Alaska on March 28, 2021 at 19:51 UTC had a depth of 65.8 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: us6000e45m). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, March 28, 2021). M3.1 Earthquake in the Unimak Island region, Alaska — March 28, 2021. Retrieved June 8, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000e45m/