M3.4 Earthquake 174 km WSW of Nikolski, Alaska — July 20, 2023
2023-07-20 16:10:03 UTC (2023-07-20) · approx. 5:10 AM UTC-11 local
On July 20, 2023 at 16:10 UTC, a magnitude 3.4 shallow crustal earthquake struck 174 km WSW of Nikolski, Alaska, at a depth of 57.2 km and coordinates 52.2450°, -171.1705°.
Physical scale: An earthquake of magnitude 3.4 releases seismic energy equivalent to roughly 1.9 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 134 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-171.1705°E
Technical Information
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Common Questions
How strong was the magnitude 3.4 earthquake near Nikolski, Alaska?
The magnitude 3.4 earthquake that struck 174 km WSW of Nikolski, Alaska on July 20, 2023 at 16:10 UTC had a depth of 57.2 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 3.4 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.4 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us6000kwaj). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, July 20, 2023). M3.4 Earthquake 174 km WSW of Nikolski, Alaska — July 20, 2023. Retrieved September 28, 2023 from https://www.earthquaketracker.org/earthquakes/event/us6000kwaj/