Tonga Trench
Tonga Trench : A deep depression in the floor of the southwestern Pacific Ocean. Its average depth is almost 11,000 m (33,000 feet), and it is about 1,400 km (900 miles) long. This fairly narrow, steep-walled break in the Earth's crust lies south-southwest of Samoa. A belt of volcanic and seismic activity is west of the trench. The Tonga Trench and the Kermadec Trench, with which it is almost continuous, form a line which, together with the Great Alpine Fault of New Zealand, creates a long slip-strike fault that is analogous to the fault in the Caribbean. Tsunamis are known to originate from the Tonga trench region. See crust, Kermadec Trench, plate tectonics, Puerto Rico Trench, trench
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