M3.3 Earthquake 148 km W of Adak, Alaska — September 29, 2022
2022-09-29 22:29:38 UTC (2022-09-29) · approx. 10:29 AM UTC-12 local
On September 29, 2022 at 22:29 UTC, a magnitude 3.3 shallow crustal earthquake struck 148 km W of Adak, Alaska, at a depth of 18.8 km and coordinates 51.6663°, -178.7500°.
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
-178.7500°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 148 km W of Adak, Alaska on September 29, 2022 at 22:29 UTC had a depth of 18.8 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: us6000iphj). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, September 29, 2022). M3.3 Earthquake 148 km W of Adak, Alaska — September 29, 2022. Retrieved December 3, 2022 from https://www.earthquaketracker.org/earthquakes/event/us6000iphj/