M3.1 Earthquake 65 km ESE of Atka, Alaska — April 7, 2025
2025-04-07 17:41:52 UTC (2025-04-07) · approx. 5:41 AM UTC-12 local
On April 7, 2025 at 17:41 UTC, a magnitude 3.1 shallow crustal earthquake struck 65 km ESE of Atka, Alaska, at a depth of 33.9 km and coordinates 51.9573°, -173.3317°.
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 5.0 mainshock that occurred 3 days ago 91 km SE of Atka, Alaska. Since the mainshock, the USGS has recorded 36 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
-173.3317°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.1 earthquake near Atka, Alaska?
The magnitude 3.1 earthquake that struck 65 km ESE of Atka, Alaska on April 7, 2025 at 17:41 UTC had a depth of 33.9 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 M5.0 one earlier?
No. This magnitude 3.1 earthquake is an aftershock of the larger magnitude 5.0 mainshock that occurred earlier 91 km SE of Atka, 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: us7000pvm5). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, April 7, 2025). M3.1 Earthquake 65 km ESE of Atka, Alaska — April 7, 2025. Retrieved June 9, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000pvm5/