南海南部沉积物波:软变形及其触发机制

王龙樟; 姚永坚; 林卫兵; 徐行; 肖娇静; 沈奥; 徐乔

doi:10.3799/dqkx.2018.303

Volume 43 Issue 10

Oct. 2018

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Article Navigation > Earth Science > 2018 > 43(10): 3462-3470

Wang Longzhang, Yao Yongjian, Lin Weibing, Xu Xing, Xiao Jiaojing, Shen Ao, Xu Qiao, 2018. Sediment Waves in the South of South China Sea: Soft Sediment Deformation and Its Triggering Mechanism. Earth Science, 43(10): 3462-3470. doi: 10.3799/dqkx.2018.303

Citation:

Wang Longzhang, Yao Yongjian, Lin Weibing, Xu Xing, Xiao Jiaojing, Shen Ao, Xu Qiao, 2018. Sediment Waves in the South of South China Sea: Soft Sediment Deformation and Its Triggering Mechanism. Earth Science, 43(10): 3462-3470. doi: 10.3799/dqkx.2018.303

Citation:

Wang Longzhang, Yao Yongjian, Lin Weibing, Xu Xing, Xiao Jiaojing, Shen Ao, Xu Qiao, 2018. Sediment Waves in the South of South China Sea: Soft Sediment Deformation and Its Triggering Mechanism. Earth Science, 43(10): 3462-3470. doi: 10.3799/dqkx.2018.303

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Sediment Waves in the South of South China Sea: Soft Sediment Deformation and Its Triggering Mechanism

doi: 10.3799/dqkx.2018.303

1.
College of Marine Science and Technology, China University of Geosciences, Wuhan 430074, China
2.
MNR Key Laboratory of Marine Mineral Resources, Guangzhou Marine Geological Survey, Guangzhou 510760, China

Received Date: 2018-05-19
Publish Date: 2018-10-20

Abstract

Abstract

At present, the cause of sediment waves is still controversial. Detailed interpretation of the seismic profiles in the south of South China Sea, supports the discovery of an enormous submarine landslide, which covers a distance of 160 km. Analyzed from the seismic profiles, the landslide body consists of depletion zone, accumulation zone, main scarp, crown scarp, rupture surface, separation surface and transverse cracks. The submarine landslide was triggered by earthquake activity, according to the very low seabed slope (only 0.3°~0.5°) and the enormous scale of the landslide body. The sediment waves are common in the accumulation zone. Based on morphological characteristics and shearing stress analysis, the sediment waves formed through the compression of the depletion zone with a maximum stress in the middle part, leading to counter-clockwise shearing in the lower part and clockwise shearing in the upper part. Therefore, the sediment waves are soft sediment deformation caused by submarine landslide. Soft deformation sediment wave is a special mark of submarine landslide, and this study promotes the discovery of submarine landslide and also contributes to the disaster reduction and prevention of submarine engineering.
- the south of South China Sea,
- sediment waves,
- soft sediment deformation,
- submarine landslide,
- triggering mechanism,
- sedimentology

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