M3.2 Earthquake 123 km SE of Atka, Alaska — December 18, 2025
2025-12-18 22:33:17 UTC (2025-12-18) · approx. 10:33 AM UTC-12 local
On December 18, 2025 at 22:33 UTC, a magnitude 3.2 shallow crustal earthquake struck 123 km SE of Atka, Alaska, at a depth of 35.0 km and coordinates 51.4075°, -172.9352°.
Physical scale: An earthquake of magnitude 3.2 releases seismic energy equivalent to roughly 951 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 97 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-172.9352°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.2 earthquake near Atka, Alaska?
The magnitude 3.2 earthquake that struck 123 km SE of Atka, Alaska on December 18, 2025 at 22:33 UTC had a depth of 35.0 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 3.2 earthquakes can continue for several days and gradually diminish over time.
What should I do after an earthquake?
If you were in the affected area: check yourself and others for injuries, inspect your home for damage, and be prepared for aftershocks. For detailed guidance, see our earthquake safety guide and emergency planning resources.
Actions
Understanding This Data
Magnitude 3.2 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000s0c1). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, December 18, 2025). M3.2 Earthquake 123 km SE of Atka, Alaska — December 18, 2025. Retrieved May 24, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000s0c1/