EARTHQUAKE ADVISORY

12 December 2025: With regard to the recent earthquake that occurred at 2315hrs on Monday, 8 December 2025 that struck Northern Japan and affected Hokkaido, Aomori and Iwate Prefectures; the Japanese Government has issued a Subsequent Earthquake Advisory.

Off the Coast of Hokkaido and Sanriku Subsequent Earthquake Advisory

If a M7.0 or greater earthquake occurs in or around the probable source region of megaquakes along the Japan and Chishima Trenches, the possibility of a large earthquake is considered to be relatively high. JMA issues Off the Coast of Hokkaido and Sanriku Subsequent Earthquake Advisory in such cases, even though probability based on actual worldwide records is only about 1/100.