M3.3 Earthquake 73 km NNE of Petersville, Alaska — June 20, 2023
2023-06-20 22:52:19 UTC (2023-06-20) · approx. 12:52 PM UTC-10 local
On June 20, 2023 at 22:52 UTC, a magnitude 3.3 intermediate depth earthquake struck 73 km NNE of Petersville, Alaska, at a depth of 107.8 km and coordinates 63.1418°, -150.4777°.
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
-150.4777°E
Technical Information
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Common Questions
How strong was the magnitude 3.3 earthquake near Petersville, Alaska?
The magnitude 3.3 earthquake that struck 73 km NNE of Petersville, Alaska on June 20, 2023 at 22:52 UTC had a depth of 107.8 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 3.3 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: ak0237v6b2g4). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, June 20, 2023). M3.3 Earthquake 73 km NNE of Petersville, Alaska — June 20, 2023. Retrieved August 26, 2023 from https://www.earthquaketracker.org/earthquakes/event/ak0237v6b2g4/