Overview
- A magnitude 7.5–7.6 offshore earthquake struck at 11:15 p.m. JST with a depth of about 50–54 kilometers, delivering a maximum JMA intensity of 6-strong in Aomori’s Hachinohe area.
- The Japan Meteorological Agency issued tsunami warnings for the Pacific coasts of Hokkaido, Aomori and Iwate, with waves observed up to 70 centimeters at Kuji before advisories were downgraded and lifted by early morning.
- The JMA and Cabinet Office announced the first Hokkaido–Sanriku aftershock earthquake advisory, calling for one week of heightened vigilance without pre-evacuation, covering designated areas from Hokkaido to Chiba across 182 municipalities.
- Prime Minister Sanae Takaichi activated the government’s crisis center and ordered life-first rescue operations, with preliminary reports indicating about 30 people injured and no abnormalities reported at the Higashidori and Onagawa nuclear plants at the time.
- JR East suspended Tohoku Shinkansen services between Fukushima and Shin-Aomori for safety checks following the quake.