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首页> 外文期刊>Geochemistry, geophysics, geosystems >Anisotropy in the lowermost mantle beneath the Indian Ocean Geoid Low from ScS splitting measurements
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Anisotropy in the lowermost mantle beneath the Indian Ocean Geoid Low from ScS splitting measurements

机译:来自ScS分裂测量的印度洋大地水准面低地幔下层地幔的各向异性

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摘要

The Indian Ocean Geoid Low (IOGL) to the south of Indian subcontinent is the world's largest geoid anomaly. In this study, we investigate the seismic anisotropy of the lowermost mantle beneath the IOGL by analyzing splitting of high-quality ScS phases corrected for source and receiver side upper mantle anisotropy. Results reveal significant anisotropy (similar to 1: 01) in the D '' layer. The observed fast axis polarization azimuths in the ray coordinate system indicate a TTI (transverse isotropy with a tilted axis of symmetry) style of anisotropy. Lattice Preferred Orientation (LPO) deformation of the palaeo-subducted slabs experiencing high shear strain is a plausible explanation for the observed anisotropy beneath the IOGL.
机译:印度次大陆以南的印度洋大地水准面低压(IOGL)是世界上最大的大地水准面异常。在这项研究中,我们通过分析针对源侧和接收侧上地幔各向异性校正的高质量ScS相的分裂,研究了IOGL下最下地幔的地震各向异性。结果显示,D''层中具有显著的各向异性(类似于1:01%)。在射线坐标系中观测到的快轴偏振方位角表明了各向异性的TTI(具有倾斜轴的横向各向同性)风格。经历高剪切应变的古俯冲板的晶格优先取向(LPO)变形是对IOGL下观测到的各向异性的合理解释。

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