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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, Wei1,2; Alves, Tiago M.3; Wu, Shiguo2; Rebesco, Michele4; Zhao, Fang5; Mi, Lijun6; Ma, Benjun7
2016-10-01
发表期刊EARTH AND PLANETARY SCIENCE LETTERS
卷号451页码:272-284
文章类型Article
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.
关键词South China Sea Continental Slope Seafloor Undulations Submarine Creep Landslides
DOI10.1016/j.epsl.2016.07.007
收录类别SCI
语种英语
WOS记录号WOS:000382595500027
引用统计
被引频次:6[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
版本出版稿
条目标识符http://ir.qdio.ac.cn/handle/337002/135867
专题海洋地质与环境重点实验室
作者单位1.Univ Kiel, Inst Geosci, D-24118 Kiel, Germany
2.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
3.Cardiff Univ, Sch Earth & Ocean Sci, Seism Lab 3D, Main Bldg,Pk Pl, Cardiff CF10 3AT, S Glam, Wales
4.Ist Nazl Oceanog & Geofis Sperimentale OGS, Borgo Grotta Gigante 42-C, I-34010 Trieste, Italy
5.Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China
6.China Natl Offshore Oil Corp Ltd, Shenzhen Branch Co, Guangzhou 510420, Guangdong, Peoples R China
7.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
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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.
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