If such a megaquake were to occur, it could potentially cause a dangerous tsunami that could put thousands of lives at risk.

Thousands gathered in mourning on Thursday, Dec. 26, to mark two decades since the world’s largest tsunami. On Dec. 26, 2004, in one of the worst natural disasters of the modern era, a 9.1 magnitude ...

JAPAN issued a tsunami advisory after a magnitude 6.9 earthquake struck the country on Monday. The quake was at a depth of 23 miles and mainly hit the southwestern Kyushu region, said the ...