M3.9 Earthquake 51 km E of Pedro Bay, Alaska — August 3, 2023
2023-08-03 21:56:48 UTC (2023-08-03) · approx. 11:56 AM UTC-10 local
On August 3, 2023 at 21:56 UTC, a magnitude 3.9 intermediate depth earthquake struck 51 km E of Pedro Bay, Alaska, at a depth of 106.4 km and coordinates 59.7320°, -153.1950°.
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
-153.1950°E
Technical Information
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Common Questions
How strong was the magnitude 3.9 earthquake near Pedro Bay, Alaska?
The magnitude 3.9 earthquake that struck 51 km E of Pedro Bay, Alaska on August 3, 2023 at 21:56 UTC had a depth of 106.4 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: ak0239vxdtm6). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, August 3, 2023). M3.9 Earthquake 51 km E of Pedro Bay, Alaska — August 3, 2023. Retrieved October 7, 2023 from https://www.earthquaketracker.org/earthquakes/event/ak0239vxdtm6/