M3.3 Earthquake 56 km NW of Skwentna, Alaska — August 9, 2026
2026-08-09 09:53:46 UTC (27 min ago) · approx. 11:53 PM UTC-10 local
On August 9, 2026 at 09:53 UTC, a magnitude 3.3 shallow crustal earthquake struck 56 km NW of Skwentna, Alaska, at a depth of 5.0 km and coordinates 62.2850°, -152.2750°.
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 1 day ago 57 km WNW of Skwentna, 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
-152.2750°E
Technical Information
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Common Questions
How strong was the magnitude 3.3 earthquake near Skwentna, Alaska?
The magnitude 3.3 earthquake that struck 56 km NW of Skwentna, Alaska on August 9, 2026 at 09:53 UTC had a depth of 5.0 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 57 km WNW of Skwentna, Alaska. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Understanding This Data
Magnitude 3.3 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: aka2026prcpvq). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, August 9, 2026). M3.3 Earthquake 56 km NW of Skwentna, Alaska — August 9, 2026. Retrieved August 9, 2026 from https://www.earthquaketracker.org/earthquakes/event/aka2026prcpvq/