Abstract: Using the seismic data recorded by Liaoning Telemetry Seismic Network(LTSN)of China from June 1999 to December 2004,the study analyzes data of 8 stations by Systematic Analysis Method(SAM)of shear-wave splitting technique. The results show that predominant polarization directions of fast shear-waves at most stations are in strike ENE(nearly E-to-W),consistent to the direction of regional principal compressive stress,and also consistent to the direction of the regional tectonic stress field in the north part of North China. However,the predominant polarization directions of fast shear-waves at station SJ in the middle of Liaoning and station KD in the southeast of Liaoning are in strike nearly N-S and NW,different from other stations,which may be controlled and influenced by the complex local geological structure. However,more data are needed to verify for details at these two stations. Also according to results from GPS,geological and geophysical data,the paper studies the regional distribution of faults and principal compressive stress directions,and discusses the spatial characteristics of shear-wave splitting in this zone.

Key words: shear-wave splitting, seismic anisotropy, principal compressive stress, crust, Liaoning area

摘要： 主要利用辽宁区域地震台网8个台站记录到的1999年6月至2004年12月的波形数据,采用剪切波分裂SAM分析方法,对辽宁地区的剪切波分裂特征进行了研究。发现大部分台站的快剪切波优势偏振方向为NEE(近EW)向,与原地主压应力方向一致,也与华北北部的区域构造应力场方向一致。然而,辽宁中部的SJ台站和东部的KD台站的快剪切波优势偏振方向分别为近NS向和NW向,与其他台站的结果有差异,可能是受到复杂的局部构造的控制和影响,这2个台站的结果还需要更多资料的证实。根据GPS、地震和地球物理等其它资料,对该地区断层的区域分布、主压应力以及剪切波分裂参数的空间分布特征进行了讨论。

关键词: 剪切波分裂, 地震各向异性, 主压应力, 地壳, 辽宁地区