M3.3 Earthquake 51 km SE of Atka, Alaska — July 29, 2026
2026-07-29 20:32:35 UTC (2026-07-29) · approx. 8:32 AM UTC-12 local
On July 29, 2026 at 20:32 UTC, a magnitude 3.3 intermediate depth earthquake struck 51 km SE of Atka, Alaska, at a depth of 73.9 km and coordinates 51.9110°, -173.6158°.
Physical scale: An earthquake of magnitude 3.3 releases seismic energy equivalent to roughly 1.3 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 114 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-173.6158°E
Technical Information
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Common Questions
How strong was the magnitude 3.3 earthquake near Atka, Alaska?
The magnitude 3.3 earthquake that struck 51 km SE of Atka, Alaska on July 29, 2026 at 20:32 UTC had a depth of 73.9 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 3.3 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.3 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us6000th1s). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, July 29, 2026). M3.3 Earthquake 51 km SE of Atka, Alaska — July 29, 2026. Retrieved August 21, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000th1s/