M4.2 Earthquake 65 km NNW of Yonakuni, Japan — September 14, 2025
2025-09-14 18:41:52 UTC (2025-09-14) · approx. 2:41 AM UTC+8 local
On September 14, 2025 at 18:41 UTC, a magnitude 4.2 intermediate depth earthquake struck 65 km NNW of Yonakuni, Japan, at a depth of 153.8 km and coordinates 25.0212°, 122.7764°.
Physical scale: An earthquake of magnitude 4.2 releases seismic energy equivalent to roughly 30 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 476 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
122.7764°E
Technical Information
Common Questions
How strong was the magnitude 4.2 earthquake near Yonakuni, Japan?
The magnitude 4.2 earthquake that struck 65 km NNW of Yonakuni, Japan on September 14, 2025 at 18:41 UTC had a depth of 153.8 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 4.2 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.2 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000qw70). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, September 14, 2025). M4.2 Earthquake 65 km NNW of Yonakuni, Japan — September 14, 2025. Retrieved December 3, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000qw70/