M3.1 Earthquake 54 km SE of Adak, Alaska — August 18, 2025
2025-08-18 19:18:29 UTC (2025-08-18) · approx. 7:18 AM UTC-12 local
On August 18, 2025 at 19:18 UTC, a magnitude 3.1 shallow crustal earthquake struck 54 km SE of Adak, Alaska, at a depth of 35.0 km and coordinates 51.4755°, -176.1640°.
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.
Earthquake Details
-176.1640°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake near Adak, Alaska?
The magnitude 3.1 earthquake that struck 54 km SE of Adak, Alaska on August 18, 2025 at 19:18 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.
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Understanding This Data
Magnitude 3.1 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us6000ridj). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, August 18, 2025). M3.1 Earthquake 54 km SE of Adak, Alaska — August 18, 2025. Retrieved November 4, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000ridj/