Question: What tectonic plate is located west of a trench which reaches a maximum-known depth of 10994 m?
Context: The Nazca Plate, named after the Nazca region of southern Peru, is an oceanic tectonic plate in the eastern Pacific Ocean basin off the west coast of South America.  The ongoing subduction, along the Peru–Chile Trench, of the Nazca Plate under the South American Plate is largely responsible for the Andean orogeny.  The Nazca Plate is bounded on the west by the Pacific Plate and to the south by the Antarctic Plate through the East Pacific Rise and the Chile Rise respectively.  The movement of the Nazca Plate over several hotspots has created some volcanic islands as well as east-west running seamount chains that subduct under South America.  Nazca is a relatively young plate both in terms of the age of its rocks and its existence as an independent plate having been formed from the break-up of the Farallon Plate about 23 million years ago.  The oldest rocks of the plate are about 50 million years old. The Okhotsk Plate is a minor tectonic plate covering the Sea of Okhotsk, the Kamchatka Peninsula, Sakhalin Island and Tōhoku and Hokkaidō in Japan.  It was formerly considered a part of the North American Plate, but recent studies indicate that it is an independent plate, bounded on the north by the North American Plate.  The boundary is a left-lateral moving transform fault, the Ulakhan Fault.  On the east, the plate is bounded by the Pacific Plate at the Kuril-Kamchatka Trench and the Japan Trench, on the south by the Philippine Sea Plate at the Nankai Trough, on the west by the Eurasian Plate, and possibly on the southwest by the Amurian Plate. The Mariana Trench or Marianas Trench is the deepest part of the world's oceans.  It is located in the western Pacific Ocean, an average of 200 km to the east of the Mariana Islands, in the Western Pacific East of Philippines.  It is a crescent-shaped scar in the Earth's crust, and measures about 2550 km long and 69 km wide on average.  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 .  If Mount Everest were dropped into the trench at this point, its peak would still be over 1.6 km underwater.  In 2009, Marianas Trench was established as a United States National Monument. The Manila Trench is an oceanic trench in the Pacific Ocean, located west of the islands of Luzon and Mindoro in the Philippines.  The trench reaches a depth of about 5400 m , in contrast with the average depth of the South China Sea of about 1500 m .  It is created by subduction, in which the Sunda Plate (part of Eurasian Plate) is subducting under the Philippine Mobile Belt, producing this almost N-S trending trench.  The convergent boundary is terminated to the north by the Taiwan collision zone, and to the south by the Mindoro terrane (Sulu-Palawan block colliding with SW Luzon).  It is an area pervaded by negative gravity anomalies. Tectonic erosion or subduction erosion is the loss of crust from an overriding tectonic plate due to subduction.  Two types of tectonic erosion exist: frontal erosion at the outer margin of a plate and basal erosion at the base of the plate's crust.  Basal erosion causes a thinning of the overriding plate.  When frontal tectonic erosion consumes a crustal block at the outer margin it may induce a domino effect on upper crustal tectonics causing the remaining blocks to fault and tilt to fill the “gap” left by the consumed block.  Subduction erosion is believed to be enhanced by high convergence rates and low sediment supply to the trench. The Niuafo'ou Plate is a small tectonic plate located west of the islands of Tonga.  This plate is sandwiched between the Pacific Plate to the north, the very unstable Tonga Plate to the east and the Australian Plate to the west.  It is primarily surrounded by convergent boundaries.  This plate is riddled with active faults thus making the area extremely earthquake prone. The Explorer Plate is an oceanic tectonic plate beneath the Pacific Ocean off the west coast of Vancouver Island, Canada and is partially subducted under the North American Plate.  Along with the Juan De Fuca Plate and Gorda Plate, the Explorer Plate is a remnant of the ancient Farallon Plate which has been subducted under the North American Plate.  The Explorer Plate separated from the Juan De Fuca Plate roughly 4 million years ago.  In its smoother, southern half, the average depth of the Explorer plate is roughly 2400 m and rises up in its northern half to a highly variable basin between 1400 m and 2200 m in depth. The Kermadec Plate is a very long and narrow tectonic plate located west of the Kermadec Trench in the south Pacific Ocean.  Also included on this tectonic plate is a small portion of the North Island of New Zealand and the Kermadec Islands.  It is separated from the Australian Plate by a long divergent boundary which forms a back-arc basin.  This area is highly prone to earthquakes and tsunami. The Tonga Plate is a small southwest Pacific tectonic plate or microplate.  It is centered at approximately 19° S. latitude and 173° E. longitude.  The plate is an elongated plate oriented NNE - SSW and is a northward continuation of the Kermadec linear zone north of New Zealand.  The plate is bounded on the east and north by the Pacific Plate, on the northwest by the Niuafo’ou Microplate, on the west and south by the Indo-Australian Plate.  The Tonga plate is subducting the Pacific plate along the Tonga Trench.  This subduction turns into a transform fault boundary north of Tonga.  An active rift or spreading center separates the Tonga from the Australian plate and the Niuafo’ou microplate to the west.  The Tonga plate is seismically very active and is rotating clockwise. The Mariana Plate is a small tectonic plate located west of the Mariana Trench and forms the basement of the Mariana Islands.  It is separated from the Philippine Sea Plate by a long divergent boundary with numerous transform fault offsets.  The boundary between the Mariana and the Pacific Plate to the east is a subduction zone with the Pacific Plate subducting beneath the Mariana.  The Mariana Trench forms the southeastern boundary and the Izu-Ogasawara Trench the northeastern boundary.
Answer: Mariana Plate