M3.9 Earthquake 167 km WNW of Attu Station, Alaska — July 1, 2026
2026-07-01 20:55:39 UTC (2026-07-01) · approx. 7:55 AM UTC+11 local
On July 1, 2026 at 20:55 UTC, a magnitude 3.9 shallow crustal earthquake struck 167 km WNW of Attu Station, Alaska, at a depth of 39.1 km and coordinates 53.3513°, 170.8311°.
Physical scale: An earthquake of magnitude 3.9 releases seismic energy equivalent to roughly 11 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 296 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
170.8311°E
Technical Information
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Common Questions
How strong was the magnitude 3.9 earthquake near Attu Station, Alaska?
The magnitude 3.9 earthquake that struck 167 km WNW of Attu Station, Alaska on July 1, 2026 at 20:55 UTC had a depth of 39.1 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 3.9 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.9 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us6000taxx). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, July 1, 2026). M3.9 Earthquake 167 km WNW of Attu Station, Alaska — July 1, 2026. Retrieved July 29, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000taxx/