M4.0 Earthquake 60 km SSE of Kokhanok, Alaska — September 29, 2024
2024-09-29 21:29:48 UTC (2024-09-29) · approx. 11:29 AM UTC-10 local
On September 29, 2024 at 21:29 UTC, a magnitude 4.0 intermediate depth earthquake struck 60 km SSE of Kokhanok, Alaska, at a depth of 116.7 km and coordinates 58.9682°, -154.2416°.
Physical scale: An earthquake of magnitude 4.0 releases seismic energy equivalent to roughly 15 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 347 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 5.5 mainshock that occurred 5 days ago 92 km NNW of Aleneva, Alaska. Since the mainshock, the USGS has recorded 4 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
-154.2416°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.0 earthquake near Kokhanok, Alaska?
The magnitude 4.0 earthquake that struck 60 km SSE of Kokhanok, Alaska on September 29, 2024 at 21:29 UTC had a depth of 116.7 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.0 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M5.5 one earlier?
No. This magnitude 4.0 earthquake is an aftershock of the larger magnitude 5.5 mainshock that occurred earlier 92 km NNW of Aleneva, Alaska. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Understanding This Data
Magnitude 4.0 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: ak024cjue5zc). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2024, September 29, 2024). M4.0 Earthquake 60 km SSE of Kokhanok, Alaska — September 29, 2024. Retrieved December 6, 2024 from https://www.earthquaketracker.org/earthquakes/event/ak024cjue5zc/