M3.5 Earthquake 72 km WSW of Atka, Alaska — July 19, 2023
2023-07-19 19:32:27 UTC (2023-07-19) · approx. 7:32 AM UTC-12 local
On July 19, 2023 at 19:32 UTC, a magnitude 3.5 intermediate depth earthquake struck 72 km WSW of Atka, Alaska, at a depth of 78.5 km and coordinates 52.0137°, -175.2133°.
Physical scale: An earthquake of magnitude 3.5 releases seismic energy equivalent to roughly 2.7 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 157 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-175.2133°E
Technical Information
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Common Questions
How strong was the magnitude 3.5 earthquake near Atka, Alaska?
The magnitude 3.5 earthquake that struck 72 km WSW of Atka, Alaska on July 19, 2023 at 19:32 UTC had a depth of 78.5 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 3.5 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.5 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000kgyi). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, July 19, 2023). M3.5 Earthquake 72 km WSW of Atka, Alaska — July 19, 2023. Retrieved September 28, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000kgyi/