M3.1 Earthquake 87 km ENE of Chignik, Alaska — February 18, 2022
2022-02-18 22:07:23 UTC (2022-02-18) · approx. 12:07 PM UTC-10 local
On February 18, 2022 at 22:07 UTC, a magnitude 3.1 shallow crustal earthquake struck 87 km ENE of Chignik, Alaska, at a depth of 41.2 km and coordinates 56.4782°, -157.0289°.
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
-157.0289°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake near Chignik, Alaska?
The magnitude 3.1 earthquake that struck 87 km ENE of Chignik, Alaska on February 18, 2022 at 22:07 UTC had a depth of 41.2 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: ak02229eh3ae). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, February 18, 2022). M3.1 Earthquake 87 km ENE of Chignik, Alaska — February 18, 2022. Retrieved April 30, 2022 from https://www.earthquaketracker.org/earthquakes/event/ak02229eh3ae/