M4.8 Earthquake Kuji, Japan

On June 25, 2026 at 11:58 UTC, a magnitude 4.8 shallow crustal earthquake struck 39 km NE of Kuji, Japan, at a depth of 66.6 km and coordinates 40.4809°, 142.0284°. This earthquake was detected by 173 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.

This earthquake is part of an ongoing aftershock sequence following the magnitude 6.9 mainshock that occurred 17 hours ago 30 km ENE of Kuji, Japan. Since the mainshock, the USGS has recorded 2 aftershocks in this area. Aftershock activity is expected to continue for weeks to months as stresses on surrounding faults redistribute.

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

Common Questions

How strong was the magnitude 4.8 earthquake near Kuji, Japan?

The magnitude 4.8 earthquake that struck 39 km NE of Kuji, Japan on June 25, 2026 at 11:58 UTC had a depth of 66.6 km. For context, this was a light earthquake commonly felt near the epicenter.

Where did the earthquake occur?

The earthquake epicenter was located at 40.4809°, 142.0284°, which is 39 km NE of Kuji, 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.

Is this the same earthquake as the M6.9 one earlier?

No. This magnitude 4.8 earthquake is an aftershock of the larger magnitude 6.9 mainshock that occurred earlier 30 km ENE of Kuji, Japan. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.

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.

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.

M4.8 Earthquake 39 km NE of Kuji, Japan — June 25, 2026

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