M3.0 Earthquake 60 km WNW of Ninilchik, Alaska — September 22, 2023
2023-09-22 22:03:14 UTC (2023-09-22) · approx. 12:03 PM UTC-10 local
On September 22, 2023 at 22:03 UTC, a magnitude 3.0 intermediate depth earthquake struck 60 km WNW of Ninilchik, Alaska, at a depth of 115.7 km and coordinates 60.3317°, -152.5965°.
Physical scale: An earthquake of magnitude 3.0 releases seismic energy equivalent to roughly 477 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 71 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-152.5965°E
Technical Information
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Common Questions
How strong was the magnitude 3.0 earthquake near Ninilchik, Alaska?
The magnitude 3.0 earthquake that struck 60 km WNW of Ninilchik, Alaska on September 22, 2023 at 22:03 UTC had a depth of 115.7 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 3.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.0 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak023c6mj6ex). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, September 22, 2023). M3.0 Earthquake 60 km WNW of Ninilchik, Alaska — September 22, 2023. Retrieved December 2, 2023 from https://www.earthquaketracker.org/earthquakes/event/ak023c6mj6ex/