Kong Fansheng, Gao Rui, Gao Stephen S, Liu Kelly H, Ding Weiwei, Niu Xiongwei, Ruan Aiguo, Tan Pingchuan, Fan Jianke, Lu Shaoping, Tong Zhengyi, Cheng Liqun, Gong Wenfei, Zhao Yanghui, Li Jiabiao
Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou310012, China.
Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai519082, China.
Natl Sci Rev. 2023 Jun 16;10(10):nwad176. doi: 10.1093/nsr/nwad176. eCollection 2023 Oct.
It has long been established that plastic flow in the asthenosphere interacts constantly with the overlying lithosphere and plays a pivotal role in controlling the occurrence of geohazards such as earthquakes and volcanic eruptions. Unfortunately, accurately characterizing the direction and lateral extents of the mantle flow field is notoriously difficult, especially in oceanic areas where deployment of ocean bottom seismometers (OBSs) is expensive and thus rare. In this study, by applying shear wave splitting analyses to a dataset recorded by an OBS array that we deployed between mid-2019 and mid-2020 in the South China Sea (SCS), we show that the dominant mantle flow field has a NNW-SSE orientation, which can be attributed to mantle flow extruded from the Tibetan Plateau by the ongoing Indian-Eurasian collision. In addition, the results suggest that E-W oriented flow fields observed in South China and the Indochina Peninsula do not extend to the central SCS.
长期以来，人们已经确定软流圈中的塑性流动与上覆岩石圈不断相互作用，并在控制地震和火山爆发等地壳灾害的发生方面发挥着关键作用。不幸的是，准确描述地幔流场的方向和横向范围非常困难，尤其是在海底地震仪（OBS）部署成本高昂因而稀少的海洋区域。在本研究中，通过对我们于2019年年中至2020年年中在南海（SCS）部署的一个OBS阵列记录的数据集进行剪切波分裂分析，我们表明，主要地幔流场具有北北西-南南东方向，这可归因于正在进行的印度-欧亚碰撞导致从青藏高原挤出的地幔流。此外，结果表明在中国南方和印度支那半岛观测到的东西向流场并未延伸至南海中部。
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