M3.5 Earthquake 278 km SE of Chiniak, Alaska — October 15, 2023
2023-10-15 21:05:23 UTC (2023-10-15) · approx. 11:05 AM UTC-10 local
On October 15, 2023 at 21:05 UTC, a magnitude 3.5 shallow crustal earthquake struck 278 km SE of Chiniak, Alaska, at a depth of 15.6 km and coordinates 55.8004°, -149.1450°.
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
-149.1450°E
Technical Information
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Common Questions
How strong was the magnitude 3.5 earthquake near Chiniak, Alaska?
The magnitude 3.5 earthquake that struck 278 km SE of Chiniak, Alaska on October 15, 2023 at 21:05 UTC had a depth of 15.6 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 3.5 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: us6000lfsd). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, October 15, 2023). M3.5 Earthquake 278 km SE of Chiniak, Alaska — October 15, 2023. Retrieved December 26, 2023 from https://www.earthquaketracker.org/earthquakes/event/us6000lfsd/