M3.1 Earthquake 69 km ENE of Adak, Alaska — December 28, 2022
2022-12-28 21:46:37 UTC (2022-12-28) · approx. 9:46 AM UTC-12 local
On December 28, 2022 at 21:46 UTC, a magnitude 3.1 intermediate depth earthquake struck 69 km ENE of Adak, Alaska, at a depth of 147.4 km and coordinates 52.1401°, -175.7206°.
Physical scale: An earthquake of magnitude 3.1 releases seismic energy equivalent to roughly 674 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 83 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-175.7206°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake near Adak, Alaska?
The magnitude 3.1 earthquake that struck 69 km ENE of Adak, Alaska on December 28, 2022 at 21:46 UTC had a depth of 147.4 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 3.1 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.1 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000j4h5). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, December 28, 2022). M3.1 Earthquake 69 km ENE of Adak, Alaska — December 28, 2022. Retrieved March 7, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000j4h5/