M3.4 Earthquake 42 km ESE of Nikolski, Alaska — July 23, 2025
2025-07-23 23:06:12 UTC (2025-07-23) · approx. 12:06 PM UTC-11 local
On July 23, 2025 at 23:06 UTC, a magnitude 3.4 shallow crustal earthquake struck 42 km ESE of Nikolski, Alaska, at a depth of 44.3 km and coordinates 52.8181°, -168.2594°.
Physical scale: An earthquake of magnitude 3.4 releases seismic energy equivalent to roughly 1.9 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 134 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-168.2594°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.4 earthquake near Nikolski, Alaska?
The magnitude 3.4 earthquake that struck 42 km ESE of Nikolski, Alaska on July 23, 2025 at 23:06 UTC had a depth of 44.3 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 3.4 earthquakes can continue for several days and gradually diminish over time.
Actions
Understanding This Data
Magnitude 3.4 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us6000qzzm). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, July 23, 2025). M3.4 Earthquake 42 km ESE of Nikolski, Alaska — July 23, 2025. Retrieved October 11, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000qzzm/