【摘要】 利用射线追踪方法对广东阳江地区的重复地震进行位置归一处理,提高走时精度以达到观测地壳介质变化的目的。文中计算了阳江地区2002年1月至2007年9月ML≥2.0重复地震序列经射线追踪法校正后的P波走时差。结果显示,在2004年阳江4.9级地震前信宜台、湛江台、肇庆台的记录观察到该地区短期的地壳介质速度明显升高的现象。更多还原

【Abstract】 In this paper the authors normalized the position of repeated earthquakes by using ray tracing,in order to improve the accuracy of seismic wave travel time to measure crustal media variation with time.The author also calculated the travel time of Yangjiang repeated earthquakes(ML≥2.0)from Jonuary 2002 to september 2007 by using ray tracing.The results indicate the short-term velocity variation of crustal media appears before Yangjiang M=4.9 earthquake in 2004.更多还原