Overview
- The quake, which struck Monday off Iwate at 4:53 p.m. local time, measured magnitude 7.7 per Japan’s agency and 7.4 per the USGS and swayed high-rises in Tokyo.
- The meteorological agency issued tsunami warnings that forecast waves up to three meters and told people near coasts and rivers to move to higher ground.
- Ports later logged waves of about 70 to 80 centimeters at Kuji, and authorities lifted the alert after no large surge followed.
- Officials reported six injuries, including two serious, and said there was no major damage to key infrastructure or reports of large fires.
- The JMA issued a special advisory that raises the short-term chance of a magnitude‑8 or larger quake and calls for a week of caution over aftershocks, underscoring Japan’s frequent seismic activity and hard lessons from 2011.