Tokyo: Japan's Meteorological Agency issued an alert Tuesday for a potential megaquake following Monday's magnitude 7.5 earthquake off Aomori Prefecture's eastern coast, as reported by NHK Japan.

The warning cautions of possible tsunamis along the Pacific coast from Hokkaido to Chiba Prefecture, advising residents to stay vigilant for the next week without issuing evacuation orders, the first such alert since the category began in 2022.

The quake struck at 11:15 p.m. local time at a depth of 54 kilometres. As of 1:00 a.m., six people in Aomori suffered injuries from falls or falling objects at home.

Tsunami advisories, initially covering Iwate, parts of Hokkaido, and Aomori, have been lifted. Waves measured 70 centimetres at Kuji Port in Iwate, 50 centimetres in Urakawa Town, Hokkaido, and 40 centimetres at Mutsuogawara Port, Aomori, the first warning since July's Kamchatka quake.

Tohoku Shinkansen services remain suspended between Morioka and Shin-Aomori for track inspections, aiming to resume by 3:00 p.m. local time. All Nippon Airways and Japan Airlines report normal operations on Tuesday.

Prime Minister Sanae Takaichi activated a task force at the crisis management centre, directing prompt tsunami information, evacuation guidance, damage assessment, and harm prevention measures.

With inputs from ANI