临猗5.0级地震前后品质因子值变化特征研究  

Research on temporal change in coda Q-factor before and after the Linyi earthquake with M_L=5.0

作　　者：王卫东[1] 张永志[1] 杜长娥[2] 

机构地区：[1]长安大学地质工程与测绘工程学院,陕西西安710054 [2]陕西省地震局,陕西西安710068

出　　处：《地球科学与环境学报》2005年第1期70-71,79,共3页Journal of Earth Sciences and Environment

基　　金：陕西省科学技术项目(95K12 G9);中国地震局地震科学联合基金项目(95208)

摘　　要：利用西安数字地震遥测台网记录的数字地震资料,采用P波初动半周期残差法求得1998年7月临猗5.0级地震前后不同路径的Q(品质因子)值变化,发现在地震发生前Q值为87～203,震后Q值为67～164,震前震中区附近出现明显的高Q值异常.结果表明,地震前的高Q值异常可以作为地震预测的一种手段.By using the digital data recorded by Xi’an digital telemetry seismic network,the temporal change in Q-factor before and after Linyi earthquake with M_L=5.0 in July,1998 is determined through the method for half period of the first arrival P wave. It is pointed that the Q-factor is 87~203 before the earthquake and is 67~164 after the earthquake,and clear anomaly with high Q-factor appeared in the nearby areas of the epicenter before the earthquake. The result shows that anomaly with high Q-factor before a earthquake can be used as a method for earthquake forecast.

关 键 词：品质因子 数字地震资料 前震 遥测台网 变化特征 震中 异常 Q值 记录 周期 

分 类 号：P315[天文地球—地震学] P631[天文地球—固体地球物理学]