A powerful 7.5-magnitude earthquake struck off northernJapanlate Monday, injuring 23 people and triggering a tsunami in Pacific coast communities, officials said. Authorities warned of possible aftershocks and an increased risk of a megaquake.
The Japanese government was still assessing damages from thetsunamiand late-evening quake, which struck at about 11:15 p.m. in the Pacific Ocean, around 80 kilometres (50 m
