内蒙古地区中强地震序列统计特征

Statistical Characteristics of Moderately Strong Earthquake Sequences in Inner Mongolia

对1975年以来内蒙古地区5级以上震序列资料分析整理,将独立的5级以上地震序划分为孤立型、主震—余震型和多震型,并分析了地震序列类型的空间分布特征。根据余震序列资料,统计了余震序列的几项基本参数,包括最大余震震级、序列持续时间、主震–最大余震时间间隔和余震区半径等,并且拟合了序列参数和震级的线性关系,分析了序列参数的频度分布特征,在此基础上总结出震后早期地震形势判定的规则。

Based on the analysis and collation of the seismic sequence data of M5+ in Inner Mongolia since 1975, the independent earthquake sequences of M5+ are divided into isolated type, main-shock-aftershock type and multi-earthquake type, and the spatial distribution characteristics of the earthquake sequence types are analyzed. According to the data of aftershock sequence, several basic parameters of aftershock sequence are counted, including the maximum aftershock magnitude, sequence duration, main shock maximum aftershock time interval and aftershock area radius. The linear relationship between sequence parameters and magnitude is fitted, and the frequency distribution characteristics of sequence parameters are analyzed. On this basis, the rules for judging early earthquake situations after an earthquake are summarized.