M3.9 Earthquake 244 km NW of Attu Station, Alaska — March 14, 2023
2023-03-14 19:37:54 UTC (2023-03-14) · approx. 6:37 AM UTC+11 local
On March 14, 2023 at 19:37 UTC, a magnitude 3.9 shallow crustal earthquake struck 244 km NW of Attu Station, Alaska, at a depth of 10.0 km and coordinates 54.3841°, 170.5401°.
Physical scale: An earthquake of magnitude 3.9 releases seismic energy equivalent to roughly 11 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 296 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
170.5401°E
Technical Information
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Common Questions
How strong was the magnitude 3.9 earthquake near Attu Station, Alaska?
The magnitude 3.9 earthquake that struck 244 km NW of Attu Station, Alaska on March 14, 2023 at 19:37 UTC had a depth of 10.0 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 3.9 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.9 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000jkww). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, March 14, 2023). M3.9 Earthquake 244 km NW of Attu Station, Alaska — March 14, 2023. Retrieved May 20, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000jkww/