JMA issues advisory of elevated megathrust earthquake risk along Japan Trench after December 8 M7.6 Sanriku quake

"Following the M7.6 Sanriku offshore earthquake on December 8, 2025, the Japan
Meteorological Agency (JMA) warned that the likelihood of a new large-scale earthquake of Mw8 or higher occurring along the Japan Trench–Kuril Trench has increased relative to normal. While the probability remains low, JMA urged residents of Hokkaido and Tohoku’s Pacific coast to review disaster preparedness and evacuation plans." W