Overview
- The quake struck at about 5:03 p.m. local time off Iwate at a depth around 10 km, with preliminary magnitude readings of 6.7 from JMA and 6.8 from USGS.
- A JMA advisory warned of waves up to 1 meter, and sensors recorded a first unmeasurable wave at Miyako followed by roughly 10 cm at Ofunato.
- Public broadcaster NHK urged residents to stay away from shorelines as the advisory remained in effect following the initial shock.
- Aftershocks ranging from about magnitude 5.3 to 6.3 were reported in the same offshore area.
- JR East reported bullet train delays and Kyodo News noted power shortages, while authorities said there was no major damage or nuclear plant abnormalities, including at Onagawa.