M3.8 Earthquake 211 km SSE of Atka, Alaska — October 21, 2024
2024-10-21 22:35:36 UTC (2024-10-21) · approx. 10:35 AM UTC-12 local
On October 21, 2024 at 22:35 UTC, a magnitude 3.8 shallow crustal earthquake struck 211 km SSE of Atka, Alaska, at a depth of 10.0 km and coordinates 50.3590°, -173.4071°.
Physical scale: An earthquake of magnitude 3.8 releases seismic energy equivalent to roughly 7.6 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 252 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-173.4071°E
Technical Information
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Common Questions
How strong was the magnitude 3.8 earthquake near Atka, Alaska?
The magnitude 3.8 earthquake that struck 211 km SSE of Atka, Alaska on October 21, 2024 at 22:35 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 3.8 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.8 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000nqq1). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2024, October 21, 2024). M3.8 Earthquake 211 km SSE of Atka, Alaska — October 21, 2024. Retrieved January 4, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000nqq1/