India, April 20 -- A powerful 7.4-magnitude earthquake struck northern Japan on Monday, according to national broadcaster NHK, prompting tsunami warnings across coastal regions. Authorities have cautioned that waves as high as 3 metres could reach parts of Iwate Prefecture and Hokkaido, urging residents to move to higher ground. Emergency services are on alert as officials assess potential damage and monitor the evolving situation.

In its advisory, Japan said tsunami waves were already approaching coastal areas and could strike repeatedly, stressing that people must evacuate without delay and remain in safe locations until all warnings are lifted.

It also cautioned that waves could arrive earlier or later than forecast and may be higher...