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研究主要使用台湾北部13个地震台站记录到的1991年7月～2002年12月的波形数据,采用剪切波分裂SAM分析方法,对台湾北部地区的剪切波分裂特征进行了研究.发现位于宜兰盆地内的台站的快剪切波优势偏振方向为近E-W方向,而位于山脉(西部麓山带、雪山山脉和中央山脉)的台站的快剪切波优势偏振方向为NNE向或NE方向.位于海边或小岛上的台站得到的快剪切波优势偏振方向比较离散,常伴有2个快剪切波优势偏振方向,可能是受到不规则的地形或复杂的局部构造而引起的.从时间延迟的空间分布来看,以TWE台为界,该台站及以北地区的慢剪切波时间延迟大于该台站以南的慢剪切波时间延迟,这可能意味着TWE台及以北地区的地壳地震各向异性强于南部.
The study mainly uses the waveform data from July 1991 to December 2002 recorded by 13 seismological stations in northern Taiwan and studies the splitting characteristics of shear waves in the northern part of Taiwan using shear-wave split SAM analysis method. The fast shear-wave direction of the stations located in the Yilan basin has the polarization direction near EW and the fast shear-wave direction of polarization located at the stations of the mountains (western foothills, snow mountains and central mountains) is NNE direction or NE The directions of the fast shear-waves obtained by the stations located on the sea or on the island are more dispersed and often accompanied by the dominant polarization direction of the two fast shear waves, which may be caused by irregular topography or complicated local structures From the spatial distribution of time delays, the time delay of the slow shear wave in this station and the north of this station is larger than the TWE station, which may mean TWE The anisotropy of the earthquakes in Taiwan and North China is stronger than that in the South China.