On Tuesday, Japan’s weather agency issued its highest-level warning that a megaquake could follow Monday’s initial tremor. A megaquake is an earthquake measuring 8.0 or higher. The warning covers ...

TOKYO (AP) — Japan issued a megaquake advisory Tuesday after a magnitude 7.5 earthquake struck off the eastern coast of Aomori, the northernmost prefecture of Japan’s main island of Honshu, and just ...

TOKYO (AP) — Japan, one of the most earthquake-prone nations on earth, issued its first-ever “megaquake advisory” last week after a powerful quake struck off the southeastern coast of the southern ...

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 ...

TOKYO — Japan, one of the most earthquake-prone nations on earth, issued its first-ever “megaquake advisory” last week after a powerful quake struck off the southeastern coast of the southern main ...

There's a small chance a megaquake could hit Japan in the following week. But what even is that? Here's our explainer, drawing from scientific measures, historical quakes and how the unique geological ...