南なん海かいトラフ巨きょ大だい地じ震しん

noun

Nankai megathrust earthquake

Refers to a hypothetical massive earthquake expected to occur along the Nankai Trough off Japan's Pacific coast. Used in disaster preparedness and scientific contexts.

• 南なん海かいトラフ巨きょ大だい地じ震しんに備そなえて、防ぼう災さい訓くん練れんが行おこなわれた。

  Disaster drills were conducted in preparation for the Nankai megathrust earthquake.