M3.1 Earthquake 39 km SSW of Nanwalek, Alaska — April 3, 2021
2021-04-03 20:47:03 UTC (2021-04-03) · approx. 10:47 AM UTC-10 local
On April 3, 2021 at 20:47 UTC, a magnitude 3.1 shallow crustal earthquake struck 39 km SSW of Nanwalek, Alaska, at a depth of 69.9 km and coordinates 59.0477°, -152.2619°.
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
-152.2619°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake near Nanwalek, Alaska?
The magnitude 3.1 earthquake that struck 39 km SSW of Nanwalek, Alaska on April 3, 2021 at 20:47 UTC had a depth of 69.9 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: ak0214a560v7). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, April 3, 2021). M3.1 Earthquake 39 km SSW of Nanwalek, Alaska — April 3, 2021. Retrieved June 12, 2021 from https://www.earthquaketracker.org/earthquakes/event/ak0214a560v7/