A powerful 7.7-magnitude earthquake struck off the northeastern coast of Japan, prompting immediate tsunami warnings and advisories across the region. Residents were evacuated and urged to carry emergency supplies amid fears of a potential mega-quake following the seismic activity. While initial warnings indicated a tsunami threat, reports confirmed that alerts were later downgraded with no immediate reports of casualties or significant damage. Authorities remain on high alert for aftershocks and additional seismic events in the days to come, warning residents of a slightly increased risk of further major quakes.