M4.3 Earthquake 268 km SSE of Katsuura, Japan — July 10, 2025
2025-07-10 17:39:53 UTC (2025-07-10) · approx. 2:39 AM UTC+9 local
On July 10, 2025 at 17:39 UTC, a magnitude 4.3 shallow crustal earthquake struck 268 km SSE of Katsuura, Japan, at a depth of 10.0 km and coordinates 33.1158°, 141.9006°.
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
141.9006°E
Technical Information
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Common Questions
How strong was the magnitude 4.3 earthquake near Katsuura, Japan?
The magnitude 4.3 earthquake that struck 268 km SSE of Katsuura, Japan on July 10, 2025 at 17:39 UTC had a depth of 10.0 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.
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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: us6000qu78). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, July 10, 2025). M4.3 Earthquake 268 km SSE of Katsuura, Japan — July 10, 2025. Retrieved September 20, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000qu78/