M4.8 Earthquake 8 km N of Toba, Japan — July 31, 2025
2025-07-31 23:24:16 UTC (2025-07-31) · approx. 8:24 AM UTC+9 local
On July 31, 2025 at 23:24 UTC, a magnitude 4.8 deep-focus earthquake struck 8 km N of Toba, Japan, at a depth of 337.2 km and coordinates 34.5635°, 136.8457°. This earthquake was detected by 98 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 354, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.8 releases seismic energy equivalent to roughly 239 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.2 km — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in Japan, a region characterized by the intersection of four tectonic plates — Pacific, Philippine Sea, Eurasian, and North American — creating multiple subduction zones. The nearest mapped fault system is the Japan Trench. View all earthquakes in Japan.
Learn more: Magnitude scale · Aftershock sequences
Earthquake Details
136.8457°E
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Common Questions
How strong was the magnitude 4.8 earthquake near Toba, Japan?
The magnitude 4.8 earthquake that struck 8 km N of Toba, Japan on July 31, 2025 at 23:24 UTC had a depth of 337.2 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 34.5635°, 136.8457°, which is 8 km N of Toba, Japan. View all earthquakes in Japan.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.8 earthquakes can continue for several days and gradually diminish over time.
Has Japan had earthquakes this big before?
The largest recorded earthquake in Japan was the M9.1 Tohoku earthquake of March 11, 2011. Today's magnitude 4.8 event is significantly smaller than that historical record.
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Location
Authoritative source: USGS event page (event ID: us6000qx4e). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, July 31, 2025). M4.8 Earthquake 8 km N of Toba, Japan — July 31, 2025. Retrieved October 17, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000qx4e/