M3.1 Earthquake 50 km WNW of Happy Valley, Alaska — March 8, 2021
2021-03-08 20:32:23 UTC (2021-03-08) · approx. 10:32 AM UTC-10 local
On March 8, 2021 at 20:32 UTC, a magnitude 3.1 intermediate depth earthquake struck 50 km WNW of Happy Valley, Alaska, at a depth of 91.2 km and coordinates 60.0964°, -152.5857°.
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
-152.5857°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake near Happy Valley, Alaska?
The magnitude 3.1 earthquake that struck 50 km WNW of Happy Valley, Alaska on March 8, 2021 at 20:32 UTC had a depth of 91.2 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: ak0213353tvy). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, March 8, 2021). M3.1 Earthquake 50 km WNW of Happy Valley, Alaska — March 8, 2021. Retrieved May 21, 2021 from https://www.earthquaketracker.org/earthquakes/event/ak0213353tvy/