M3.8 Earthquake near Rat Islands, Aleutian Islands, Alaska — August 22, 2023
2023-08-22 21:39:21 UTC (2023-08-22) · approx. 9:39 AM UTC+12 local
On August 22, 2023 at 21:39 UTC, a magnitude 3.8 intermediate depth earthquake struck near Rat Islands, Aleutian Islands, Alaska, at a depth of 78.3 km and coordinates 51.5708°, 178.6563°.
Physical scale: An earthquake of magnitude 3.8 releases seismic energy equivalent to roughly 7.6 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 252 m — a useful intuition for the size of the slip patch on the fault.
ShakeMap — predicted shaking intensity
Modeled ground-motion intensity contoured on the Modified Mercalli scale (MMI). Computed by the USGS from the moment-tensor solution and regional ground-motion prediction equations.
Source: U.S. Geological Survey ShakeMap. View interactive ShakeMap on USGS
Earthquake Details
178.6563°E
Technical Information
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Common Questions
How strong was the magnitude 3.8 earthquake near Rat Islands, Aleutian Islands, Alaska?
The magnitude 3.8 earthquake that struck near Rat Islands, Aleutian Islands, Alaska on August 22, 2023 at 21:39 UTC had a depth of 78.3 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 3.8 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.8 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000kq7i). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, August 22, 2023). M3.8 Earthquake near Rat Islands, Aleutian Islands, Alaska — August 22, 2023. Retrieved October 28, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000kq7i/