M3.9 Earthquake 235 km WSW of Adak, Alaska — December 19, 2023
2023-12-19 17:41:49 UTC (2023-12-19) · approx. 5:41 AM UTC-12 local
On December 19, 2023 at 17:41 UTC, a magnitude 3.9 shallow crustal earthquake struck 235 km WSW of Adak, Alaska, at a depth of 46.4 km and coordinates 51.0702°, -179.7668°.
Physical scale: An earthquake of magnitude 3.9 releases seismic energy equivalent to roughly 11 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 296 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-179.7668°E
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Common Questions
How strong was the magnitude 3.9 earthquake near Adak, Alaska?
The magnitude 3.9 earthquake that struck 235 km WSW of Adak, Alaska on December 19, 2023 at 17:41 UTC had a depth of 46.4 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 3.9 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.9 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us6000m1y6). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, December 19, 2023). M3.9 Earthquake 235 km WSW of Adak, Alaska — December 19, 2023. Retrieved February 27, 2024 from https://www.earthquaketracker.org/earthquakes/event/us6000m1y6/