M3.4 Earthquake 75 km SSE of False Pass, Alaska — August 26, 2025
2025-08-26 19:56:03 UTC (2025-08-26) · approx. 8:56 AM UTC-11 local
On August 26, 2025 at 19:56 UTC, a magnitude 3.4 shallow crustal earthquake struck 75 km SSE of False Pass, Alaska, at a depth of 35.0 km and coordinates 54.2612°, -162.8515°.
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.
This earthquake is part of an ongoing aftershock sequence following the magnitude 5.4 mainshock that occurred 7 days ago 90 km SSE of False Pass, Alaska. Since the mainshock, the USGS has recorded 19 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
-162.8515°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.4 earthquake near False Pass, Alaska?
The magnitude 3.4 earthquake that struck 75 km SSE of False Pass, Alaska on August 26, 2025 at 19:56 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 3.4 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M5.4 one earlier?
No. This magnitude 3.4 earthquake is an aftershock of the larger magnitude 5.4 mainshock that occurred earlier 90 km SSE of False Pass, Alaska. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
Actions
Understanding This Data
Magnitude 3.4 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us6000rlnd). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, August 26, 2025). M3.4 Earthquake 75 km SSE of False Pass, Alaska — August 26, 2025. Retrieved November 12, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000rlnd/