M3.7 Earthquake in the Unimak Island region, Alaska — June 18, 2023
2023-06-18 23:25:31 UTC (2023-06-18) · approx. 12:25 PM UTC-11 local
On June 18, 2023 at 23:25 UTC, a magnitude 3.7 shallow crustal earthquake struck in the Unimak Island region, Alaska, at a depth of 57.2 km and coordinates 54.0144°, -163.6729°.
Physical scale: An earthquake of magnitude 3.7 releases seismic energy equivalent to roughly 5.4 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 215 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-163.6729°E
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Common Questions
How strong was the magnitude 3.7 earthquake in the Unimak Island region, Alaska?
The magnitude 3.7 earthquake that struck in the Unimak Island region, Alaska on June 18, 2023 at 23:25 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 3.7 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.7 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000k9gp). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, June 18, 2023). M3.7 Earthquake in the Unimak Island region, Alaska — June 18, 2023. Retrieved August 26, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000k9gp/