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Relation of submarine landslide to hydrate occurrences in Baiyun Depression, South China Sea

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Abstract

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.

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Acknowledgements

This work has been financially supported by the National Science Foundation of China (No. 41306037) and the National Science and Technology Works Special Project of the China Geological Survey (No. DD20160213), and Qingdao National Laboratory for Marine Science and Technology (No. 2016ASKJ13). We acknowledge the China Marine Geological Survey for its permission to release the data. We are grateful to the anonymous reviewers for their insightful reviews.

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Authors and Affiliations

  1. Evaluation and Detection Technology Laboratory of Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266003, China

    Yunbao Sun & Lei Wang

  2. Gas Hydrate Geology Division, Qingdao Institute of Marine Geology, Qingdao, 266071, China

    Yunbao Sun

  3. College of Marine Geosciences, Ocean University of China, Qingao, 266100, China

    Xiaohua Zhang

  4. Laboratory of Marine Geophysics & Geo-Resources, Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya, 572000, China

    Shiguo Wu

  5. Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, China

    Shiguo Wu

  6. College of Earth Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China

    Shiguo Wu

  7. Guangzhou Marine Geology Survey, MLR, Guangzhou, 510760, China

    Shengxiong Yang

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Sun, Y., Zhang, X., Wu, S. et al. Relation of submarine landslide to hydrate occurrences in Baiyun Depression, South China Sea. J. Ocean Univ. China 17, 129–138 (2018). https://doi.org/10.1007/s11802-018-3458-1

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