前郭—乾安地震诱发的余震前微破裂研究

Research on micro-abruption before the aftershock induced by the Qianguo-Qian'an earthquake

对2006年3月31日发生在吉林省前郭—乾安县之间的Ms4.8级地震后所诱发的一次3.7级余震之前产生的一系列特殊的微破裂事件,采用时序列分布、空间分布、谱分析以及震源力学性质等方法,进行了初步研究。给出了本地区余震前出现的微破裂事件的基本特征,为地震后的余震预报提供了一种短临异常信息参考。

According to a series of special micro-abruption events occurred before the 3.7 aftershock induced by the Ms4.8 earthquake occurredbetween Qianguo county and Qian＇an county of Jilin province on 31st of March 2006,this paper makes the elementary research by choosing the methods of sequence distribution,spatial distribution,spectrum analysis and hypocenter mechanical property,and then offers the basic characteristics of these micro-abruption events occurred before the aftershock of this area,which provides a reference of short-term precursory abnormal information to the aftershock prediction after earthquakes.