M3.9 Earthquake near Rat Islands, Aleutian Islands, Alaska — February 20, 2023
2023-02-20 18:42:29 UTC (2023-02-20) · approx. 6:42 AM UTC+12 local
On February 20, 2023 at 18:42 UTC, a magnitude 3.9 intermediate depth earthquake struck near Rat Islands, Aleutian Islands, Alaska, at a depth of 155.6 km and coordinates 51.9176°, 178.0907°.
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
178.0907°E
Technical Information
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Common Questions
How strong was the magnitude 3.9 earthquake near Rat Islands, Aleutian Islands, Alaska?
The magnitude 3.9 earthquake that struck near Rat Islands, Aleutian Islands, Alaska on February 20, 2023 at 18:42 UTC had a depth of 155.6 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: us6000jqdl). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, February 20, 2023). M3.9 Earthquake near Rat Islands, Aleutian Islands, Alaska — February 20, 2023. Retrieved April 29, 2023 from https://www.earthquaketracker.org/earthquakes/event/us6000jqdl/