M3.1 Earthquake 230 km ESE of Attu Station, Alaska — July 20, 2026
2026-07-20 05:58:54 UTC (2 days ago) · approx. 5:58 PM UTC+12 local
On July 20, 2026 at 05:58 UTC, a magnitude 3.1 shallow crustal earthquake struck 230 km ESE of Attu Station, Alaska, at a depth of 11.2 km and coordinates 51.9700°, 176.2500°.
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
176.2500°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake near Attu Station, Alaska?
The magnitude 3.1 earthquake that struck 230 km ESE of Attu Station, Alaska on July 20, 2026 at 05:58 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 3.1 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: aka2026ofwiwd). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, July 20, 2026). M3.1 Earthquake 230 km ESE of Attu Station, Alaska — July 20, 2026. Retrieved July 22, 2026 from https://www.earthquaketracker.org/earthquakes/event/aka2026ofwiwd/