Japan bracing for a massive megaquake: After a 7.7 tremor and tsunami, authorities warn of a possible magnitude 8+ earthquake. PM Sanae Takaichi has urged people to stay alert.

How serious is this rare advisory? Scroll down to read more.

Japan issues rare ‘megaquake’ warning after 7.7 magnitude tremor jolts country: 'Likelihood of huge earthquake occurring' high

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Japan issues rare ‘megaquake’ warning after 7.7 magnitude tremor jolts country: 'Likelihood of huge earthquake occurring' high