Overview
- A shallow offshore earthquake struck off Iwate at 5:03 p.m. JST, with agencies reporting magnitudes between 6.7 and 6.9.
- JMA issued a tsunami advisory for up to about 1 meter, and small waves of roughly 10–20 cm were measured at Miyako, Ofunato, Kamaishi and Kuji.
- The advisory was lifted about three hours after the mainshock as authorities reported no immediate injuries or major damage.
- Operators reported no abnormalities at nearby nuclear facilities, and JR East briefly delayed bullet train services before resuming.
- Dozens of aftershocks followed, including events up to M6.4, and officials warned of elevated risk for about a week as agency assessments continued to vary.