oceanic trough

oceanic trough

      an elongate depression in the seafloor that is characteristically shallower, shorter, narrower, and topographically gentler than oceanic trenches. Maximal depths of oceanic troughs range between 2,300 m (7,500 feet) in the Papuan Trough and 7,440 m in the Banda Trough. More typical maximum depths lie between 4 and 5 km (2.5 and 3 miles) below sea level. Lengths of the 25 best-known troughs range between 270 and 2,300 km and average about 700 km; their widths are from 20 to 100 km and average about 50 km. Unlike trenches, oceanic troughs probably owe their origins to a wide variety of geologic mechanisms.

* * *


Universalium. 2010.

Игры ⚽ Поможем написать реферат

Look at other dictionaries:

  • Oceanic trench — Oceanic crust is formed at an oceanic ridge, while the lithosphere is subducted back into the asthenosphere at trenches. The oceanic trenches are hemispheric scale long but narrow topographic depressions of the sea floor. They are also the… …   Wikipedia

  • Trough (geology) — In geology, a trough generally refers to a linear structural depression that extends laterally over a distance, while being less steep than a trench. A trough can be a narrow basin or a geologic rift. There are various oceanic troughs, troughs… …   Wikipedia

  • Nankai Trough — The Nankai Trough 南海トラフ (Nankai Torafu?) is a submarine trough located south of Japan s island of Honshū, extending approximately 900 km offshore. In plate tectonics, the Nankai Trough marks a subduction zone that is caused by subduction of… …   Wikipedia

  • Cayman Trough — Coordinates: 18°30′N 83°0′W / 18.5°N 83°W / 18.5; 83 …   Wikipedia

  • Near-equatorial trough — Since 1954, studies concluded that the near equatorial trough was associated with a maximum in oceanic sea surface temperature. It is sometimes used as a synonym for the terms near equatorial tradewind convergence,[1] Intertropical convergence… …   Wikipedia

  • Monsoon trough — August position of the ITCZ and monsoon trough in the Pacific Ocean, depicted by area of convergent streamlines in the northern Pacific The monsoon trough is that portion of the Intertropical Convergence Zone (ITCZ) which extends into or through… …   Wikipedia

  • Dawson-Lambton Trough — (76°0′S 26°0′W / 76°S 26°W / 76; 26) is an undersea trough extending from the Dawson Lambton Glacier terminus. The name proposed by Dr. Heinrich Hinze, Alfred Wegener Institute for Pol …   Wikipedia

  • Dubinin Trough — (67°10′S 80°30′E / 67.167°S 80.5°E / 67.167; 80.5) is an undersea trough named for Soviet Captain A.I. Dubinin, leader of 1957 Antarctic expedition. Name proposed by Dr. G. Agapova, Geological Institute of the Russian Ac …   Wikipedia

  • Moller Trough — (76°35′S 30°40′W / 76.583°S 30.667°W / 76.583; 30.667) is an undersea trough in the Weddell Sea named for Dietrich Moller, geodesist and former President, German Society for Pol …   Wikipedia

  • Hawaiian Trough — The Hawaiian Trough, also known as the Hawaiian Deep, is a depression of the sea floor surrounding the Hawaiian Islands, where the massive weight of the island chain downwarps the oceanic lithosphere; surrounding the islands like a moat, it is… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”