利用重复地震研究滦县地区的地壳介质变化
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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。
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.
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.
引文
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虢顺民,李志义,程绍平,等.唐山地震区域构造背景和发展模式的讨论[J].地质科学,1977,4:305-321．
李永红,潘元生,张坤,等.双差定位方法在山东地区的应用[J].地震地磁观测与研究,2006,27(4) :8-16．
孙若昧,等.京津唐地区地壳结构与强震的发生:Ⅰ.P波速度结构[J].地球物理学报,1995,38(5) :599-607．
叶秀薇,闻则刚,刘锦,等.利用重复地震研究广东阳江地区地壳介质变化[J].地震,2008,28(4) :103-111．
周龙泉,刘桂萍,马宏生,等.利用重复地震观测地壳介质变化[J].地震,2007,27(3) :1-9．
Poupinet G,Ellsworth W L,Frechet J.Monitoring velocity variations in the crust using earthquake doublets:an application to the Calaveras Fault,California[J].J Geophys Res,1984,89(B7) :5719-5731．
Rubin A M.Using repeating earthquakes to correct high-precision earthquake catalogs for time-dependent station delays[J].Bull Seism Soc Amer,2002,92(5) :1647-1659．
Schaff D P.Richards P G.Repeating seismic events in China[J].Science,2004,303:1176-1178．
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