Japan is on alert after a 7.5 magnitude earthquake struck Aomori, prompting tsunami warnings and a government advisory about a potential 'megaquake'. The earthquake occurred off the eastern coast and registered a significant intensity. While initial tsunami warnings were downgraded, authorities warn of a possible stronger tremor that could lead to 3-meter tsunami waves. Hokkaido's winter tourism season is underway, with no immediate impact on travel reported, but travelers are advised to stay informed about safety measures.