用S波研究雅江地震序列震源波谱

Study on Source Parameters for the Yajiang Earthquake Sequence Using S Wave

利用成都区域数字化地震台网记录的雅江地震序列的S波段资料 ,使用波谱分析方法计算雅江地震序列的震源参数。在对不同时段的震源参数进行初步分析后 ,得到如下结果 :①给出了适合于雅江地震序列的地震矩M0 和矩震级Mw 与里氏震级ML 的关系 ;②拐角频率从 5 0级地震前的 1 4左右下降到 5 0级地震后的 1 3左右 ,6 0级地震之后又下降到 1 2左右 ;③前震和余震的一些震源参数存在明显差异 ,可作为预测未来强震的重要指标之一。

Using the Yajiang earthquake sequence data of S wave recorded by the Chengdu Regional Digital Seismic Network,the source parameters for the Yajiang earthquake sequence are determined by using spectral analysis. Analysis of the source parameters at different times are made:The relationship of log M _0, M _w and M _L is given; The corner frequency decrease from about 1.4Hz before M 5.0 earthquake to about 1.3Hz after M 5.0 earthquake,then decrease to about 1.2Hz after M 6.0 earthquake;Some source parameters'difference is found between pre-earthquake and aftershock,it might be important for earthquake prediction.