M3.1 Earthquake 251 km W of Adak, Alaska — December 21, 2022
2022-12-21 18:30:30 UTC (2022-12-21) · approx. 6:30 AM UTC+12 local
On December 21, 2022 at 18:30 UTC, a magnitude 3.1 intermediate depth earthquake struck 251 km W of Adak, Alaska, at a depth of 95.8 km and coordinates 51.7189°, 179.7227°.
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
179.7227°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 251 km W of Adak, Alaska on December 21, 2022 at 18:30 UTC had a depth of 95.8 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 3.1 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: us7000j3aw). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, December 21, 2022). M3.1 Earthquake 251 km W of Adak, Alaska — December 21, 2022. Retrieved January 18, 2024 from https://www.earthquaketracker.org/earthquakes/event/us7000j3aw/