M4.0 Earthquake near Rat Islands, Aleutian Islands, Alaska — September 20, 2022
2022-09-20 23:04:59 UTC (2022-09-20) · approx. 11:04 AM UTC+12 local
On September 20, 2022 at 23:04 UTC, a magnitude 4.0 shallow crustal earthquake struck near Rat Islands, Aleutian Islands, Alaska, at a depth of 7.6 km and coordinates 51.4162°, 175.2711°.
Physical scale: An earthquake of magnitude 4.0 releases seismic energy equivalent to roughly 15 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 347 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
175.2711°E
Technical Information
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Common Questions
How strong was the magnitude 4.0 earthquake near Rat Islands, Aleutian Islands, Alaska?
The magnitude 4.0 earthquake that struck near Rat Islands, Aleutian Islands, Alaska on September 20, 2022 at 23:04 UTC had a depth of 7.6 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.0 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000innz). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, September 20, 2022). M4.0 Earthquake near Rat Islands, Aleutian Islands, Alaska — September 20, 2022. Retrieved November 26, 2022 from https://www.earthquaketracker.org/earthquakes/event/us6000innz/