Philippine Trench, also called Philippine Deep, Mindanao Trench, or
Mindanao Deep, is a submarine trench in the floor of the Philippine Sea of the
western North Pacific Ocean bordering the east coast of the island of Mindanao. The
abyss, which reaches the second greatest depth known in any ocean, was first
plumbed in 1927 by the German ship Emden and found to have a depth of 34,440
feet (10,497 meters). How was this trench is formed?
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Answer:
The trench formed from a collision between the Palawan and Zamboanga plates. This caused a change in geological processes going from a convergent zone to a subduction zone. The subduction zone is located west to east of the Philippine Islands. ... It hit the trench with a hypocenter depth of 34.9 km