M3.9 Earthquake 69 km S of King Cove, Alaska — September 8, 2020
2020-09-08 23:36:06 UTC (2020-09-08) · approx. 12:36 PM UTC-11 local
On September 8, 2020 at 23:36 UTC, a magnitude 3.9 intermediate depth earthquake struck 69 km S of King Cove, Alaska, at a depth of 80.8 km and coordinates 54.4408°, -162.4070°.
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.
Earthquake Details
-162.4070°E
Technical Information
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Common Questions
How strong was the magnitude 3.9 earthquake near King Cove, Alaska?
The magnitude 3.9 earthquake that struck 69 km S of King Cove, Alaska on September 8, 2020 at 23:36 UTC had a depth of 80.8 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: us7000bk4d). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, September 8, 2020). M3.9 Earthquake 69 km S of King Cove, Alaska — September 8, 2020. Retrieved November 17, 2020 from https://www.earthquaketracker.org/earthquakes/event/us7000bk4d/