M3.1 Earthquake 92 km W of Tyonek, Alaska — January 13, 2021
2021-01-13 21:59:39 UTC (2021-01-13) · approx. 11:59 AM UTC-10 local
On January 13, 2021 at 21:59 UTC, a magnitude 3.1 intermediate depth earthquake struck 92 km W of Tyonek, Alaska, at a depth of 169.8 km and coordinates 61.1569°, -152.8491°.
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
-152.8491°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake near Tyonek, Alaska?
The magnitude 3.1 earthquake that struck 92 km W of Tyonek, Alaska on January 13, 2021 at 21:59 UTC had a depth of 169.8 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: ak021luubp6). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, January 13, 2021). M3.1 Earthquake 92 km W of Tyonek, Alaska — January 13, 2021. Retrieved March 20, 2021 from https://www.earthquaketracker.org/earthquakes/event/ak021luubp6/