Search results
Results from the WOW.Com Content Network
During the 2006 Pingtung earthquake off SW Taiwan, eleven submarine cables across the Kaoping canyon and Manila Trench were broken in sequence from 1500 to 4000 m deep, as a consequence of the associated turbidity currents. [51]
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 5,400 metres (17,700 ft), [ 8 ] in contrast with the average depth of the South China Sea of about 1,500 metres (4,900 ft).
The southern area of the trench contains homogeneous blue clay silt and is poor in lime. Sand grains that were also found contained fresh basaltic andesite. [16] The sediments found in the trenches are hypothesized to have been deposited by turbidity currents. [16] A turbidity current is an underwater current that moves rapidly and carries ...
Turbidity current is caused when the density of water is increased by sediment. This current is the underwater equivalent of a landslide. When sediment increases the density of the water, it falls to the bottom, and then follows the form of the land. In doing so, the sediment inside the current gathers more from the ocean bed, which in turn ...
Tonga Trench: Pacific Ocean 10,882 35,702 6.76 3 Emden Deep: Philippine Trench, Pacific Ocean 10,545 34,580 6.54 4 Kuril–Kamchatka Trench: Pacific Ocean 10,542 34,449 6.52 5 Kermadec Trench: Pacific Ocean 10,047 32,963 6.24 6 Izu–Ogasawara Trench: Pacific Ocean 9,810 32,087 6.08 7 Japan Trench: Pacific Ocean 9,000 29,527 5.59 8 Puerto Rico ...
As a consequence, a slightly different set of sedimentary structures develops in turbidites deposited by high-density turbidity currents. This different set of structures is known as the Lowe sequence , which is a descriptive classification that complements, but does not replace, the Bouma sequence.
The thick layers of sediment gradually thin with increasing distance offshore, depending on subsidence of the passive margin and the efficacy of offshore transport mechanisms such as turbidity currents and submarine channels. Development of the shelf edge and its migration through time is critical to the development of a passive margin.
Turbidity currents, on the other hand, flow down slope across regional isobaths and are mainly responsible for supplying terrigenous sediment across continental margins to deep-water environments, such as continental rise, where fine particles are further carried in suspension by contour currents.