张北地震近场观测资料的初步解释  

A Preliminary Interpretation of Nearfield Earthquake Records in Zhangbei Earthqu ake Region

作　　者：石金虎[1] 赖晓玲[1] 段永红[1] 李松林[1] 张先康[1] 宋占隆[1] 杨健[1] 

机构地区：[1]中国地震局地球物理勘探中心

出　　处：《中国地震》1999年第2期151-158,共8页Earthquake Research in China

基　　金：中国地震局"九五"重点基金

摘　　要：本文对１９９８年１月１０日张北６２级强震的余震观测资料进行了初步处理。测定了２０５个ＭＬ≥０５的地震的震源位置，发现其余震多集中在一个长１０余公里，宽５～８ｋｍ的北东向条带内；计算了较大余震的震源机制解，推测引起主震的断裂带为北东向断裂；另外，对Ｐ波记录作了频谱分析。In this paper,a preliminary data processing was made for the aftershock records of Zhangbei 6.2 earthquake on Jan.10,1998. 205 earthquakes with M L0.5 we r e located.The result shows that most of the aftershocks are concentrated in a mo re than 10 km long,5～8 km wide belt with NE strike.The source mechanisms of lar ger aftershocks were also calculated,from which it can be deduced that the fract ured zone of the mainshock is the northeast strike fault.Furthermore,the spectra l analysis of P waves was made.The cornner frequence is about 10 Hz.

关 键 词：震源位置 震源机制解 频谱分析 观测资料 地震 

分 类 号：P315.63[天文地球—地震学]