Major earthquake strikes off Japan

Japan's northern Pacific coast was jolted by a massive 7.7-magnitude tremor on Monday afternoon, prompting immediate emergency responses.

Tsunami advisories were issued for Iwate and Aomori prefectures, with reports of waves already reaching some ports.

The earthquake caused significant disruptions to transportation, including the halting of bullet train services and major motorways.

Officials have warned of an increased risk of a potential 'mega-quake' in the region over the coming week and urged citizens to remain vigilant.