M3.3 Earthquake 44 km E of Pedro Bay, Alaska — September 16, 2020
2020-09-16 23:20:20 UTC (2020-09-16) · approx. 1:20 PM UTC-10 local
On September 16, 2020 at 23:20 UTC, a magnitude 3.3 intermediate depth earthquake struck 44 km E of Pedro Bay, Alaska, at a depth of 130.2 km and coordinates 59.8513°, -153.3320°.
Physical scale: An earthquake of magnitude 3.3 releases seismic energy equivalent to roughly 1.3 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 114 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-153.3320°E
Technical Information
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Common Questions
How strong was the magnitude 3.3 earthquake near Pedro Bay, Alaska?
The magnitude 3.3 earthquake that struck 44 km E of Pedro Bay, Alaska on September 16, 2020 at 23:20 UTC had a depth of 130.2 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 3.3 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.3 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak020bydjj7o). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, September 16, 2020). M3.3 Earthquake 44 km E of Pedro Bay, Alaska — September 16, 2020. Retrieved November 28, 2020 from https://www.earthquaketracker.org/earthquakes/event/ak020bydjj7o/