M4.1 Earthquake 137 km NNW of Kameshima, Japan — August 15, 2025
2025-08-15 20:03:17 UTC (2025-08-15) · approx. 5:03 AM UTC+9 local
On August 15, 2025 at 20:03 UTC, a magnitude 4.1 deep-focus earthquake struck 137 km NNW of Kameshima, Japan, at a depth of 390.4 km and coordinates 36.8318°, 134.7880°.
Physical scale: An earthquake of magnitude 4.1 releases seismic energy equivalent to roughly 21 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 406 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
134.7880°E
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Common Questions
How strong was the magnitude 4.1 earthquake near Kameshima, Japan?
The magnitude 4.1 earthquake that struck 137 km NNW of Kameshima, Japan on August 15, 2025 at 20:03 UTC had a depth of 390.4 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 4.1 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.1 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000r1i2). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, August 15, 2025). M4.1 Earthquake 137 km NNW of Kameshima, Japan — August 15, 2025. Retrieved November 4, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000r1i2/