Question: What tectonic plate is located west of a trench which reaches a maximum-known depth of 10994 m?
Sentence (from "Mariana Trench"): It reaches a maximum-known depth of 10994 m (± 40 m ) at a small slot-shaped valley in its floor known as the Challenger Deep, at its southern end, although some unrepeated measurements place the deepest portion at 11034 m .
Relevant evidence: Yes