131 km SE of Itoman, Japan

19 days ago

USGS

A magnitude 4.6 earthquake struck 131 km SE of Itoman, Japan on 30 Sept 2026, 21:11 UTC. The hypocentre was 10 km below the surface — shallow by seismological convention.

Depth: 10 km
Latitude: 25.22°N
Time: 21:11 UTC
Magnitude: M4.6

EPICENTRE

View the official report↗

MAGNITUDE 4.6

Noticeable shaking of indoor objects. Damage is unlikely.

The scale is logarithmic: this released about 250 times the energy of a magnitude 3.0, roughly the energy of 120 tonnes of TNT.

10 KM DEEP

Shallow earthquakes release their energy close to the surface, so they are felt more strongly, and do more damage, than deeper earthquakes of the same magnitude.