It's the line between two plates, the Nazca Plate, the South American plate here, the Nazca Plate here.

它是位于南美板块和纳斯卡板块两个板块之间。

But since the end of the Jurassic, the South American plate of that whole landmass had been moving westward.

但自侏罗纪末期以来，整个大陆的南美板块一直在向西移动。

The collision caused the edge of the Nazca plate to get pushed under the South American plate, in a process called subduction.

碰撞导致纳斯卡板块的边缘被推到南美板块下方，这个过程称为俯冲。