M3.0 Earthquake 72 km E of Port Alsworth, Alaska — June 20, 2025
2025-06-20 21:01:07 UTC (2025-06-20) · approx. 11:01 AM UTC-10 local
On June 20, 2025 at 21:01 UTC, a magnitude 3.0 intermediate depth earthquake struck 72 km E of Port Alsworth, Alaska, at a depth of 121.3 km and coordinates 60.1570°, -153.0040°.
Physical scale: An earthquake of magnitude 3.0 releases seismic energy equivalent to roughly 477 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 71 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-153.0040°E
Technical Information
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Common Questions
How strong was the magnitude 3.0 earthquake near Port Alsworth, Alaska?
The magnitude 3.0 earthquake that struck 72 km E of Port Alsworth, Alaska on June 20, 2025 at 21:01 UTC had a depth of 121.3 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 3.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.0 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak0257v5eodm). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, June 20, 2025). M3.0 Earthquake 72 km E of Port Alsworth, Alaska — June 20, 2025. Retrieved September 2, 2025 from https://www.earthquaketracker.org/earthquakes/event/ak0257v5eodm/