I think a lot of scientists worldwide wondered whether this particular subduction zone - the Japan trench, the southern part - could ever produce a great earthquake.

我想世界上有很多科学家都想知道这一俯冲带——日本海沟南部——是否会发生一次大型地震。

youdao

Where the Pacific plate collides with the Indo-Australian plate, it is forced downwards into the trench, a subduction zone, and the volcanoes are carried with it.

BBC: Undersea mountains march into the abyss