M3.9 Earthquake 31 km ESE of Atka, Alaska — September 16, 2024
2024-09-16 18:52:27 UTC (2024-09-16) · approx. 6:52 AM UTC-12 local
On September 16, 2024 at 18:52 UTC, a magnitude 3.9 intermediate depth earthquake struck 31 km ESE of Atka, Alaska, at a depth of 80.4 km and coordinates 52.0687°, -173.7876°.
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.
ShakeMap — predicted shaking intensity
Modeled ground-motion intensity contoured on the Modified Mercalli scale (MMI). Computed by the USGS from the moment-tensor solution and regional ground-motion prediction equations.
Source: U.S. Geological Survey ShakeMap. View interactive ShakeMap on USGS
Earthquake Details
-173.7876°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.9 earthquake near Atka, Alaska?
The magnitude 3.9 earthquake that struck 31 km ESE of Atka, Alaska on September 16, 2024 at 18:52 UTC had a depth of 80.4 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: us7000nebk). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2024, September 16, 2024). M3.9 Earthquake 31 km ESE of Atka, Alaska — September 16, 2024. Retrieved November 23, 2024 from https://www.earthquaketracker.org/earthquakes/event/us7000nebk/