Relation of Submarine Landslide to HydrateOccurrences in Baiyun Depression,South China Sea

查看全文 作　　者：SUN [1,2]Yunbao;ZHANG [3]Xiaohua;WU [4,5,6]Shiguo;WANG [1]Lei;YANG [7]Shengxiong

机构地区：[1]Evaluation and Detection Technology Laboratory of Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266003,China;[2]Gas Hydrate Geology Division,Qingdao Institute of Marine Geology,Qingdao 266071,China;[3]College of Marine Geosciences,Ocean University of China,Qingao 266100,China;[4]Laboratory of Marine Geophysics&Geo-Resources,Institute of Deep-sea Science and Engineering,Chinese Academy of Sciences,Sanya 572000,China;[5]Qingdao National Laboratory for Marine Science and Technology,Qingdao 266237,China;[6]College of Earth Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;[7]Guangzhou Marine Geology Survey,MLR,Guangzhou 510760,China

出　　处：《Journal of Ocean University of China》索引2018年第17卷第1期,共10页

基　　金：supported by the National Science Foundation of China (No. 41306037); the National Science and Technology Works Special Project of the China Geological Survey (No. DD20160213);Qingdao National Laboratory for Marine Science and Technology (No. 2016ASKJ13) 摘　　要：Submarine landslides have been observed in the Baiyun Depression of the South China Sea. The occurrence of hydrates below these landslides indicates that these slope instabilities may be closely related to the massive release of methane. In this study, we used a simple Monte-Carlo model to determine the first-order deformation pattern of a gravitationally destabilizing slope. The results show that a stress concentration occurs due to hydrate dissociation on the nearby glide surface and on top of a gas chimney structure. Upon the dissolution of the gas hydrate, slope failure occurs due to the excess pore pressure generated by the dissociation of the gas hydrates. When gas hydrates dissociate at shallow depths, the excess pore pressure generated can be greater than the total stress acting at those points, along with the forces that resist sliding. Initially, the failure occurs at the toe of the slope, then extends to the interior. Although our investigation focused only on the contribution of hydrate decomposition to submarine landslide, this process is also affected by both the slope material properties and topography. 关键词：HYDRATE CANYON SUBMARINE SLIDE South China Sea

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Relation of Submarine Landslide to HydrateOccurrences in Baiyun Depression,South China Sea

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