M3.1 Earthquake 121 km E of Chignik, Alaska — July 23, 2026
2026-07-23 21:19:59 UTC (2026-07-23) · approx. 11:19 AM UTC-10 local
On July 23, 2026 at 21:19 UTC, a magnitude 3.1 intermediate depth earthquake struck 121 km E of Chignik, Alaska, at a depth of 70.8 km and coordinates 56.2620°, -156.4500°.
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
-156.4500°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake near Chignik, Alaska?
The magnitude 3.1 earthquake that struck 121 km E of Chignik, Alaska on July 23, 2026 at 21:19 UTC had a depth of 70.8 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: aka2026ompdjf). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, July 23, 2026). M3.1 Earthquake 121 km E of Chignik, Alaska — July 23, 2026. Retrieved August 10, 2026 from https://www.earthquaketracker.org/earthquakes/event/aka2026ompdjf/