M3.1 Earthquake 42 km NE of Nelson Lagoon, Alaska — September 17, 2021
2021-09-17 22:04:20 UTC (2021-09-17) · approx. 11:04 AM UTC-11 local
On September 17, 2021 at 22:04 UTC, a magnitude 3.1 intermediate depth earthquake struck 42 km NE of Nelson Lagoon, Alaska, at a depth of 179.9 km and coordinates 56.2307°, -160.6635°.
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
-160.6635°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake near Nelson Lagoon, Alaska?
The magnitude 3.1 earthquake that struck 42 km NE of Nelson Lagoon, Alaska on September 17, 2021 at 22:04 UTC had a depth of 179.9 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: ak021bycuo9t). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, September 17, 2021). M3.1 Earthquake 42 km NE of Nelson Lagoon, Alaska — September 17, 2021. Retrieved December 3, 2021 from https://www.earthquaketracker.org/earthquakes/event/ak021bycuo9t/