M3.5 Earthquake 205 km SE of Perryville, Alaska — July 18, 2023
2023-07-18 21:11:48 UTC (2023-07-18) · approx. 11:11 AM UTC-10 local
On July 18, 2023 at 21:11 UTC, a magnitude 3.5 shallow crustal earthquake struck 205 km SE of Perryville, Alaska, at a depth of 11.9 km and coordinates 54.6257°, -156.8310°.
Physical scale: An earthquake of magnitude 3.5 releases seismic energy equivalent to roughly 2.7 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 157 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-156.8310°E
Technical Information
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Common Questions
How strong was the magnitude 3.5 earthquake near Perryville, Alaska?
The magnitude 3.5 earthquake that struck 205 km SE of Perryville, Alaska on July 18, 2023 at 21:11 UTC had a depth of 11.9 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 3.5 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.5 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak02395gimfs). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, July 18, 2023). M3.5 Earthquake 205 km SE of Perryville, Alaska — July 18, 2023. Retrieved September 28, 2023 from https://www.earthquaketracker.org/earthquakes/event/ak02395gimfs/