M3.7 Earthquake 103 km W of Adak, Alaska — March 11, 2023
2023-03-11 19:43:57 UTC (2023-03-11) · approx. 7:43 AM UTC-12 local
On March 11, 2023 at 19:43 UTC, a magnitude 3.7 shallow crustal earthquake struck 103 km W of Adak, Alaska, at a depth of 11.3 km and coordinates 51.8682°, -178.1370°.
Physical scale: An earthquake of magnitude 3.7 releases seismic energy equivalent to roughly 5.4 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 215 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-178.1370°E
Technical Information
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Common Questions
How strong was the magnitude 3.7 earthquake near Adak, Alaska?
The magnitude 3.7 earthquake that struck 103 km W of Adak, Alaska on March 11, 2023 at 19:43 UTC had a depth of 11.3 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 3.7 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.7 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000jj74). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, March 11, 2023). M3.7 Earthquake 103 km W of Adak, Alaska — March 11, 2023. Retrieved May 16, 2024 from https://www.earthquaketracker.org/earthquakes/event/us7000jj74/