M4.4 Earthquake 112 km E of Namie, Japan — October 21, 2025
2025-10-21 18:48:32 UTC (2025-10-21) · approx. 3:48 AM UTC+9 local
On October 21, 2025 at 18:48 UTC, a magnitude 4.4 shallow crustal earthquake struck 112 km E of Namie, Japan, at a depth of 35.0 km and coordinates 37.5486°, 142.2691°.
Physical scale: An earthquake of magnitude 4.4 releases seismic energy equivalent to roughly 60 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 655 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
142.2691°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.4 earthquake near Namie, Japan?
The magnitude 4.4 earthquake that struck 112 km E of Namie, Japan on October 21, 2025 at 18:48 UTC had a depth of 35.0 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 4.4 earthquakes can continue for several days and gradually diminish over time.
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.
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Understanding This Data
Magnitude 4.4 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000riih). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, October 21, 2025). M4.4 Earthquake 112 km E of Namie, Japan — October 21, 2025. Retrieved May 26, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000riih/