M3.0 Earthquake in the Kodiak Island region, Alaska — November 21, 2023
2023-11-21 14:43:43 UTC (2023-11-21) · approx. 4:43 AM UTC-10 local
On November 21, 2023 at 14:43 UTC, a magnitude 3.0 shallow crustal earthquake struck in the Kodiak Island region, Alaska, at a depth of 11.9 km and coordinates 56.3639°, -152.0992°.
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
-152.0992°E
Technical Information
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Common Questions
How strong was the magnitude 3.0 earthquake in the Kodiak Island region, Alaska?
The magnitude 3.0 earthquake that struck in the Kodiak Island region, Alaska on November 21, 2023 at 14:43 UTC had a depth of 11.9 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 3.0 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: ak023exq9ahu). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, November 21, 2023). M3.0 Earthquake in the Kodiak Island region, Alaska — November 21, 2023. Retrieved February 1, 2024 from https://www.earthquaketracker.org/earthquakes/event/ak023exq9ahu/