X is located along the West Coast of South America where the Nazca oceanic plate is subducting (D) underneath the South American continent.

Earthquakes due to tear faulting (A) or along a transform fault (C) occur in places such as the San Andreas fault where the North American plate and the Pacific plate are slipping and sliding past each other.

Earthquakes due to diverging plates (B) occur, for instance, along the Mid-Atlantic Ridge.