【摘要】 运用双差定位法,对滦县地区2002年1月至2010年8月M_L≥2.0地震进行精定位,利用射线追踪方法,对滦县地区的重复地震进行位置归一处理,计算滦县地区重复地震序列经过射线追踪方法校正后得到的P波走时差变化。研究发现,2010年3月6日滦县M_L 4.7地震前糙甸地震台、兴隆东地震台、蓟县地震台和遵化地震台记录到P波走时差的低值异常变化。更多还原

【Abstract】 The author relocated the earthquakes M_L≥2.0 from January 2002 to August 2010 which occurred in Luanxian area with the method of double difference,normalized the location of the repeated earthquakes in the study area by using ray tracing method,and calculated the P wave travel time difference change of the repeated earthquakes after corrected with ray tracing method.The results show that before the Luanxian M_L 4.7 earthquake in the March 6, 2010,the low value abnormal change of P wave travel time difference were found at Caodian, Xinglongdong,Zunhua and Jixian Seismic Stations.更多还原