M3.9 Earthquake 77 km SE of Nikolski, Alaska — April 30, 2022
2022-04-30 15:58:12 UTC (2022-04-30) · approx. 4:58 AM UTC-11 local
On April 30, 2022 at 15:58 UTC, a magnitude 3.9 shallow crustal earthquake struck 77 km SE of Nikolski, Alaska, at a depth of 41.7 km and coordinates 52.3805°, -168.1708°.
Physical scale: An earthquake of magnitude 3.9 releases seismic energy equivalent to roughly 11 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 296 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-168.1708°E
Technical Information
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Common Questions
How strong was the magnitude 3.9 earthquake near Nikolski, Alaska?
The magnitude 3.9 earthquake that struck 77 km SE of Nikolski, Alaska on April 30, 2022 at 15:58 UTC had a depth of 41.7 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 3.9 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.9 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000h636). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, April 30, 2022). M3.9 Earthquake 77 km SE of Nikolski, Alaska — April 30, 2022. Retrieved July 9, 2022 from https://www.earthquaketracker.org/earthquakes/event/us7000h636/