Japan tells residents to evacuate as powerful earthquake strikes north-east

90,000 people advised to take shelter after 7.5-magnitude quake, with 20 injuries reported

A powerful 7.5-magnitude earthquake has shaken north-eastern Japan, injuring more than 20 people and triggering a tsunami of up to 70cm in Pacific coast communities.

The earthquake and tsunami warnings prompted orders for about 90,000 residents to evacuate their homes, although the warnings were later downgraded to advisories.