M3.9 Earthquake 86 km SE of King Cove, Alaska — July 25, 2023
2023-07-25 15:31:32 UTC (2023-07-25) · approx. 4:31 AM UTC-11 local
On July 25, 2023 at 15:31 UTC, a magnitude 3.9 shallow crustal earthquake struck 86 km SE of King Cove, Alaska, at a depth of 44.3 km and coordinates 54.6201°, -161.2069°.
Physical scale: An earthquake of magnitude 3.9 releases seismic energy equivalent to roughly 11 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 296 m — a useful intuition for the size of the slip patch on the fault.
ShakeMap — predicted shaking intensity
Modeled ground-motion intensity contoured on the Modified Mercalli scale (MMI). Computed by the USGS from the moment-tensor solution and regional ground-motion prediction equations.
Source: U.S. Geological Survey ShakeMap. View interactive ShakeMap on USGS
Earthquake Details
-161.2069°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.9 earthquake near King Cove, Alaska?
The magnitude 3.9 earthquake that struck 86 km SE of King Cove, Alaska on July 25, 2023 at 15:31 UTC had a depth of 44.3 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 3.9 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.9 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000ki98). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, July 25, 2023). M3.9 Earthquake 86 km SE of King Cove, Alaska — July 25, 2023. Retrieved September 30, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000ki98/