Overview
- Updated observations show a maximum tsunami height of 64 cm at Kuji Port in Iwate and 50 cm at Urakawa in Hokkaido.
- Tsunami waves were recorded across five prefectures, including Aomori, Miyagi and Fukushima, according to the JMA.
- The magnitude-7.5 earthquake struck on December 8 off the east coast of Aomori Prefecture.
- More than 50 earthquakes of intensity 1 or greater followed the main shock, with activity easing but ongoing.
- The JMA issued the Hokkaido–Sanriku offshore later-earthquake caution advisory for the first time after the event.