M3.2 Earthquake 45 km NNW of Atka, Alaska — September 12, 2023
2023-09-12 23:23:16 UTC (2023-09-12) · approx. 11:23 AM UTC-12 local
On September 12, 2023 at 23:23 UTC, a magnitude 3.2 intermediate depth earthquake struck 45 km NNW of Atka, Alaska, at a depth of 180.2 km and coordinates 52.5813°, -174.4375°.
Physical scale: An earthquake of magnitude 3.2 releases seismic energy equivalent to roughly 951 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 97 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-174.4375°E
Technical Information
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Common Questions
How strong was the magnitude 3.2 earthquake near Atka, Alaska?
The magnitude 3.2 earthquake that struck 45 km NNW of Atka, Alaska on September 12, 2023 at 23:23 UTC had a depth of 180.2 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 3.2 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.2 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us6000lb00). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, September 12, 2023). M3.2 Earthquake 45 km NNW of Atka, Alaska — September 12, 2023. Retrieved November 18, 2023 from https://www.earthquaketracker.org/earthquakes/event/us6000lb00/