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<p>Using the shear wave splitting (SAM) system and waveform data of small near-field earthquakes recorded in the Liaoning regional digital seismic network between January 2008 and December 2018, the polarization direction of the fast shear wave and the time delay of the slow shear wave were determined at eight stations in southern Liaoning. An investigation is conducted into the dividing properties of shear waves at the Yingkou (YKO) and GAX (GAX) stations. Furthermore, the upper mantle anisotropy parameter features are computed and analyzed using spitilab software in conjunction with the observed SKS remote seismic wave shape data. Fast waves have an average polarization direction of NWW, and their respective delay times are 0.65∼1.36 s. It is inferred that the upper mantle deformation in southern Liaoning is not merely a single vertical coherent deformation or mantle flow, but rather both coexist based on the properties of the crust and mantle structure. Simultaneously, the anisotropic thickness in southern Liaoning is estimated to be around 74∼156 km, with an average thickness of 115 km. Upon conducting an exhaustive analysis, it becomes evident that the anisotropy observed in this region is primarily due to the influence of the upper mantle. This establishes a foundational framework for further inquiries concerning the attributes of the tectonic environment and local stress field.</p>

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The anisotropy characteristics of crust-mantle media in southern Liaoning were studied by shear wave splitting

  • 期刊论文

  • 发表日期：

    2026年4月23日

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  • Cai-yun Xia,
  • Yong-xian Zhang,
  • Zihao Li,
  • Ya-nan Chen,
  • Chen-yang Gao,
  • Yan Wang

摘要

Using the shear wave splitting (SAM) system and waveform data of small near-field earthquakes recorded in the Liaoning regional digital seismic network between January 2008 and December 2018, the polarization direction of the fast shear wave and the time delay of the slow shear wave were determined at eight stations in southern Liaoning. An investigation is conducted into the dividing properties of shear waves at the Yingkou (YKO) and GAX (GAX) stations. Furthermore, the upper mantle anisotropy parameter features are computed and analyzed using spitilab software in conjunction with the observed SKS remote seismic wave shape data. Fast waves have an average polarization direction of NWW, and their respective delay times are 0.65∼1.36 s. It is inferred that the upper mantle deformation in southern Liaoning is not merely a single vertical coherent deformation or mantle flow, but rather both coexist based on the properties of the crust and mantle structure. Simultaneously, the anisotropic thickness in southern Liaoning is estimated to be around 74∼156 km, with an average thickness of 115 km. Upon conducting an exhaustive analysis, it becomes evident that the anisotropy observed in this region is primarily due to the influence of the upper mantle. This establishes a foundational framework for further inquiries concerning the attributes of the tectonic environment and local stress field.