A giant, submarine creep zone as a precursor of large-scale slope instability offshore the Dongsha Islands (South China Sea)

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	A giant, submarine creep zone as a precursor of large-scale slope instability offshore the Dongsha Islands (South China Sea)
	Li, Wei; Alves, Tiago M.; Wu, Shiguo; Rebesco, Michele; Zhao, Fang; Mi, Lijun; Ma, Benjun
刊名	EARTH AND PLANETARY SCIENCE LETTERS
	2016
卷号	451 页码:272-284
关键词	South China Sea continental slope seafloor undulations submarine creep landslides
通讯作者	Wu, SG (reprint author), Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China. ; Zhao, F (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China.
中文摘要	A giant submarine creep zone exceeding 800 km(2) on the continental slope offshore the Dongsha Islands, South China Sea, is investigated using bathymetric and 3D seismic data tied to borehole information. The submarine creep zone is identified as a wide area of seafloor undulations with ridges and troughs. The troughs form NW- and WNW-trending elongated depressions separating distinct seafloor ridges, which are parallel or sub-parallel to the continental slope. The troughs are 0.8-4.7 km-long and 0.4 to 2.1 km-wide. The ridges have wavelengths of 1-4 km and vertical relief of 10-30 m. Slope strata are characterised by the presence of vertically stacked ridges and troughs at different stratigraphic depths, but remaining relatively stationary in their position. The interpreted ridges and troughs are associated with large-scale submarine creep, and the troughs can be divided into three types based on their different internal characters and formation processes. The large-scale listric faults trending downslope below MTD 1 and horizon To may be the potential glide planes for the submarine creep movement. High sedimentation rates, local fault activity and the frequent earthquakes recorded on the margin are considered as the main factors controlling the formation of this giant submarine creep zone. Our results are important to the understanding of sediment instability on continental slopes as: a) the interpreted submarine creep is young, or even active at present, and b) areas of creeping may evolve into large-scale slope instabilities, as recorded by similar large-scale events in the past. (C) 2016 Elsevier B.V. All rights reserved.
学科主题	Geochemistry & Geophysics
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/15318]
专题	南海海洋研究所_中科院边缘海地质重点实验室
推荐引用方式 GB/T 7714	Li, Wei,Alves, Tiago M.,Wu, Shiguo,et al. A giant, submarine creep zone as a precursor of large-scale slope instability offshore the Dongsha Islands (South China Sea)[J]. EARTH AND PLANETARY SCIENCE LETTERS,2016,451:272-284.
APA	Li, Wei.,Alves, Tiago M..,Wu, Shiguo.,Rebesco, Michele.,Zhao, Fang.,...&Ma, Benjun.(2016).A giant, submarine creep zone as a precursor of large-scale slope instability offshore the Dongsha Islands (South China Sea).EARTH AND PLANETARY SCIENCE LETTERS,451,272-284.
MLA	Li, Wei,et al."A giant, submarine creep zone as a precursor of large-scale slope instability offshore the Dongsha Islands (South China Sea)".EARTH AND PLANETARY SCIENCE LETTERS 451(2016):272-284.