M4.8 Earthquake 7 km E of Nanao, Japan — February 23, 2026
2026-02-23 23:03:41 UTC (2026-02-23) · approx. 8:03 AM UTC+9 local
On February 23, 2026 at 23:03 UTC, a magnitude 4.8 intermediate depth earthquake struck 7 km E of Nanao, Japan, at a depth of 259.4 km and coordinates 37.0384°, 137.0444°. This earthquake was detected by 107 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
137.0444°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.8 earthquake near Nanao, Japan?
The magnitude 4.8 earthquake that struck 7 km E of Nanao, Japan on February 23, 2026 at 23:03 UTC had a depth of 259.4 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 37.0384°, 137.0444°, which is 7 km E of Nanao, 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.
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.
Authoritative source: USGS event page (event ID: us7000rzvv). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, February 23, 2026). M4.8 Earthquake 7 km E of Nanao, Japan — February 23, 2026. Retrieved May 15, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000rzvv/