M3.0 Earthquake 203 km SE of Chignik, Alaska — June 18, 2025
2025-06-18 17:22:47 UTC (2025-06-18) · approx. 7:22 AM UTC-10 local
On June 18, 2025 at 17:22 UTC, a magnitude 3.0 shallow crustal earthquake struck 203 km SE of Chignik, Alaska, at a depth of 11.2 km and coordinates 54.9199°, -156.2757°.
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
-156.2757°E
Technical Information
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Common Questions
How strong was the magnitude 3.0 earthquake near Chignik, Alaska?
The magnitude 3.0 earthquake that struck 203 km SE of Chignik, Alaska on June 18, 2025 at 17:22 UTC had a depth of 11.2 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: ak0257rs2tva). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, June 18, 2025). M3.0 Earthquake 203 km SE of Chignik, Alaska — June 18, 2025. Retrieved September 2, 2025 from https://www.earthquaketracker.org/earthquakes/event/ak0257rs2tva/