Overview
- The Japan Meteorological Agency reported an undersea quake off the Sanriku coast at 4:53 p.m. Monday, putting its magnitude near 7.5.
- Tsunami warnings for Hokkaido, Iwate and Aomori forecast waves up to three meters, prompting orders to move to higher ground and designated shelters.
- Shaking reached Upper 5 in Hashikami and Lower 5 in parts of Iwate and Miyagi on Japan’s 0–7 intensity scale, a level that can make walking hard and damage weak walls.
- Safety protocols halted Tohoku Shinkansen service between Tokyo and Shin-Anmori while operators inspected tracks and nearby nuclear plants reported no immediate problems.
- Officials warned of strong aftershocks and hours of sea‑level swings, a risk well known on the tsunami‑prone Sanriku coast since 2011.