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Shear-wave splitting of Sichuan Regional Seismic Network

机译:四川区域地震台网剪切波分裂

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摘要

Using seismic data recorded by the Chengdu Digital Seismic Network from May 1, 2000 to December 31, 2006, we obtain the dominant polarization directions of fast shear-waves at eight digital seismic stations adopting the SAM technique. The results show that the dominant directions of polarizations of fast shear-waves at most of sta- tions are mainly in nearly NE,-SW or NW-SE direction in Sichuan. The dominant polarization directions of the fast shear-waves at stations located at the active faults or intersection of several active faults are consistent with the strikes of active faults which control the earthquakes used in the analysis, and are basically consistent with the directions of regional compression axis. However, several stations show that the fast shear-waves are not consis- tent with the strikes of active faults and the directions of regional compression axis, due to the influence of local complicated crustal structure.
机译:利用2000年5月1日至2006年12月31日由成都数字地震台网记录的地震资料,我们采用SAM技术获得了8个数字地震台站的快速剪切波的主极化方向。结果表明,四川大多数台站的快速切变波的偏振主方向主要在近NE,-SW或NW-SE方向。位于活动断层或多个活动断层相交处的站点上的快速剪切波的主要极化方向与控制分析中所用地震的活动断层走向一致,并且基本上与区域压缩方向一致。轴。但是,有几个台站显示,由于局部复杂的地壳结构的影响,快速剪切波与活动断层的走向和区域压缩轴的方向不一致。

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