Japan has issued a megaquake advisory after Monday's 7.6 magnitude earthquake, warning of increased risk of a magnitude-8 or larger quake within the next week that could trigger a devastating 98-foot tsunami Prime Minister Sanae Takaichi speaks to reporters after the quake (Image: AP)

Japan has issued a megaquake warning following Monday's earthquake that rocked the country's eastern coast, resulting in over 30 injuries and a residential fire.

Monday's quake, registering at a significant 7.6 on the Richter scale , could have wreaked extensive damage across vast areas, prompting the Japan Meteorological Agency to warn of an increased risk of a subsequent, magnitude-8 or larger quake within the next week, reports the Mirror .

Government reports suggest another offshore megaq

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