M3.3 Earthquake 173 km E of Atka, Alaska — June 4, 2026
2026-06-04 15:37:08 UTC (8 hours ago) · approx. 4:37 AM UTC-11 local
On June 4, 2026 at 15:37 UTC, a magnitude 3.3 shallow crustal earthquake struck 173 km E of Atka, Alaska, at a depth of 10.0 km and coordinates 52.2920°, -171.6670°.
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.
This earthquake is part of an ongoing aftershock sequence following the magnitude 5.6 mainshock that occurred 13 days ago 173 km E of Atka, Alaska. Since the mainshock, the USGS has recorded 11 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
-171.6670°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.3 earthquake near Atka, Alaska?
The magnitude 3.3 earthquake that struck 173 km E of Atka, Alaska on June 4, 2026 at 15:37 UTC had a depth of 10.0 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.
Is this the same earthquake as the M5.6 one earlier?
No. This magnitude 3.3 earthquake is an aftershock of the larger magnitude 5.6 mainshock that occurred earlier 173 km E of Atka, Alaska. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
What should I do after an earthquake?
If you were in the affected area: check yourself and others for injuries, inspect your home for damage, and be prepared for aftershocks. For detailed guidance, see our earthquake safety guide and emergency planning resources.
Actions
Understanding This Data
Magnitude 3.3 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: aka2026kzqqia). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, June 4, 2026). M3.3 Earthquake 173 km E of Atka, Alaska — June 4, 2026. Retrieved June 4, 2026 from https://www.earthquaketracker.org/earthquakes/event/aka2026kzqqia/