天然地震的横波分裂及其应用

Shear Wave Splitting of Earthquake and its Application

横波分裂方法是地震学中研究地球内部介质各向异性的重要方法之一。首先在对横波分裂方法进行研究的基础上,利用波形相关法对横波分裂进行了研究。然后通过选择合理的时间窗口可以计算出地下介质的快波偏振方向和快、慢波时间延迟,从而得到断裂带走向和断裂发育程度。最后,利用波形相关法对广西地区QXY01台站宽频带地震记录数据进行了分析和研究,该结果与当地的地质构造情况相吻合。

The shear wave splitting is one of the most important study tools to study the anisotropy of the earth＇s internal media in seismology.Based upon the study of the shear wave splitting techniques,this paper uses wave correlation method to deal with the shear wave splitting.By setting aproper time window,it can calculate the polarization direction of fast wave and the time delay of fast and slow wave for underground medium to get the trend of fault zone and fracture degree.Finally,the method is applied to the earthquake data acquired at station QXY01 in Guangxi portable earthquake networks,which is consistent with the local geological structure.