M3.1 Earthquake 96 km SE of False Pass, Alaska — April 1, 2025
2025-04-01 19:49:25 UTC (2025-04-01) · approx. 8:49 AM UTC-11 local
On April 1, 2025 at 19:49 UTC, a magnitude 3.1 shallow crustal earthquake struck 96 km SE of False Pass, Alaska, at a depth of 35.0 km and coordinates 54.1899°, -162.4497°.
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.
This earthquake is part of an ongoing aftershock sequence following the magnitude 5.4 mainshock that occurred 14 days ago 93 km SE 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
-162.4497°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake near False Pass, Alaska?
The magnitude 3.1 earthquake that struck 96 km SE of False Pass, Alaska on April 1, 2025 at 19:49 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 3.1 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 3.1 earthquake is an aftershock of the larger magnitude 5.4 mainshock that occurred earlier 93 km SE of False Pass, Alaska. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Understanding This Data
Magnitude 3.1 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us6000q4l2). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, April 1, 2025). M3.1 Earthquake 96 km SE of False Pass, Alaska — April 1, 2025. Retrieved June 6, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000q4l2/