"Please stay prepared to evacuate immediately if you feel any shaking, while continuing your socioeconomic activities.”

Osaka Metro Co. conducted a disaster drill early Saturday at a train station in the major western Japan city it serves to prepare for

Japan has been struck by another strong earthquake — a 6.9-magnitude tremor hitting the same Pacific coastal region shaken by Monday’s 7.5 mega-quake. The new quake triggered a tsunami advisory, warning of 1-meter waves across Hokkaido,

Japan’s latest disaster advisory has revived a chilling term in the seismology world: “megaquake.” The warning followed a powerful offshore shock and raised the prospect of a far larger rupture that could unleash towering waves,

Japanese authorities say a megaquake could cause a devastating tsunami to strike eastern coastal areas of Japan

Japan authorities hope the alert will encourage residents to prepare for the worst, recalling the 2011 catastrophe that killed nearly 20,000 people.

Japan is warning about a potential megaquake after a massive earthquake struck parts of the country. CBS News' Errol Barnett reports.

Japan ’s weather agency has issued its highest-level warning that a megaquake could follow Monday’s 7.5-magnitude tremor. Authorities urged anyone living near the Pacific coast to remain vigilant throughout the coming week and to prepare evacuation plans in case they need to flee their homes.