M4.0 Earthquake 32 km E of Pedro Bay, Alaska — August 8, 2020
2020-08-08 22:54:20 UTC (2020-08-08) · approx. 12:54 PM UTC-10 local
On August 8, 2020 at 22:54 UTC, a magnitude 4.0 intermediate depth earthquake struck 32 km E of Pedro Bay, Alaska, at a depth of 142.1 km and coordinates 59.7705°, -153.5246°.
Physical scale: An earthquake of magnitude 4.0 releases seismic energy equivalent to roughly 15 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 347 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-153.5246°E
Technical Information
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Common Questions
How strong was the magnitude 4.0 earthquake near Pedro Bay, Alaska?
The magnitude 4.0 earthquake that struck 32 km E of Pedro Bay, Alaska on August 8, 2020 at 22:54 UTC had a depth of 142.1 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.0 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: ak020a5v6uly). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, August 8, 2020). M4.0 Earthquake 32 km E of Pedro Bay, Alaska — August 8, 2020. Retrieved October 21, 2020 from https://www.earthquaketracker.org/earthquakes/event/ak020a5v6uly/