A significant tsunami warning has been issued for Japan following a powerful 7.4 magnitude earthquake that struck off the northeastern coast. The Japan Meteorological Agency and the US Geological Survey have both confirmed the earthquake's magnitude. Officials are warning that tsunami waves could potentially reach up to three meters (9.8 feet) in height, particularly in vulnerable coastal areas. This warning has immediately prompted emergency services to prepare for potential evacuations, with a strong emphasis on closely monitoring the unfolding situation to ensure public safety.