The quakes struck Omachi at 1.20pm and 2.54pm, with the nation’s weather agency warning of aftershocks over the next week or so.

The quakes struck Omachi at 1.20pm and 2.54pm, with the nation’s weather agency warning of aftershocks over the next week or so.

A 7.5-magnitude earthquake struck off Japan’s northeastern coast Monday, prompting authorities to warn residents to avoid coastal areas where tsunami...