M4.0 Earthquake 77 km NNW of False Pass, Alaska — October 20, 2024
2024-10-20 18:43:05 UTC (2024-10-20) · approx. 7:43 AM UTC-11 local
On October 20, 2024 at 18:43 UTC, a magnitude 4.0 intermediate depth earthquake struck 77 km NNW of False Pass, Alaska, at a depth of 208.3 km and coordinates 55.4752°, -163.9548°.
Physical scale: An earthquake of magnitude 4.0 releases seismic energy equivalent to roughly 15 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 347 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-163.9548°E
Technical Information
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Common Questions
How strong was the magnitude 4.0 earthquake near False Pass, Alaska?
The magnitude 4.0 earthquake that struck 77 km NNW of False Pass, Alaska on October 20, 2024 at 18:43 UTC had a depth of 208.3 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.0 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000nzwy). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2024, October 20, 2024). M4.0 Earthquake 77 km NNW of False Pass, Alaska — October 20, 2024. Retrieved December 26, 2024 from https://www.earthquaketracker.org/earthquakes/event/us6000nzwy/