M3.3 Earthquake 69 km SSE of Adak, Alaska — October 1, 2023
2023-10-01 19:23:09 UTC (2023-10-01) · approx. 7:23 AM UTC-12 local
On October 1, 2023 at 19:23 UTC, a magnitude 3.3 shallow crustal earthquake struck 69 km SSE of Adak, Alaska, at a depth of 35.0 km and coordinates 51.3316°, -176.1241°.
Physical scale: An earthquake of magnitude 3.3 releases seismic energy equivalent to roughly 1.3 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 114 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-176.1241°E
Technical Information
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Common Questions
How strong was the magnitude 3.3 earthquake near Adak, Alaska?
The magnitude 3.3 earthquake that struck 69 km SSE of Adak, Alaska on October 1, 2023 at 19:23 UTC had a depth of 35.0 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 3.3 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.3 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us6000lfff). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, October 1, 2023). M3.3 Earthquake 69 km SSE of Adak, Alaska — October 1, 2023. Retrieved December 14, 2023 from https://www.earthquaketracker.org/earthquakes/event/us6000lfff/