Japan issued a “megaquake advisory” following a 7.1-magnitude earthquake off its coast. That raised the risk of a larger quake on the Nankai Trough, an underwater subduction zone. Japan issued a “megaquake advisory” following a 7.1-magnitude earthquake off its coast. That raised the risk of a larger quake on the Nankai Trough, an underwater subduction zone. NBC News Science
Why Japan issued its first-ever ‘megaquake advisory’ — and what that means
