M4.3 Earthquake 125 km S of Honchō, Japan — December 11, 2025
2025-12-11 21:39:54 UTC (2025-12-11) · approx. 7:39 AM UTC+10 local
On December 11, 2025 at 21:39 UTC, a magnitude 4.3 shallow crustal earthquake struck 125 km S of Honchō, Japan, at a depth of 47.7 km and coordinates 41.0014°, 143.0109°.
Physical scale: An earthquake of magnitude 4.3 releases seismic energy equivalent to roughly 43 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 558 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
143.0109°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.3 earthquake near Honchō, Japan?
The magnitude 4.3 earthquake that struck 125 km S of Honchō, Japan on December 11, 2025 at 21:39 UTC had a depth of 47.7 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 4.3 earthquakes can continue for several days and gradually diminish over time.
What should I do after an earthquake?
If you were in the affected area: check yourself and others for injuries, inspect your home for damage, and be prepared for aftershocks. For detailed guidance, see our earthquake safety guide and emergency planning resources.
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Understanding This Data
Magnitude 4.3 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000ru9s). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, December 11, 2025). M4.3 Earthquake 125 km S of Honchō, Japan — December 11, 2025. Retrieved May 24, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000ru9s/