1993年7月湖北咸宁4.1级地震序列的活动特征

ACTIVITY CHARACTERS OF EARTHQUAKE (M_L=4.1) SWARM OF XIANNING, HUBEI IN JULY 1993

1993年 7月底至 8月中旬在咸宁发生的ML4 .1震群是一比较典型的有感震群 ,通过多种测震手段对该震群进行分析和处理 ,得到下列认识和结果 :1、该震群是一个非前兆震群。 2、此震群是一个主震型震群 ,地震主要发生在两个阶段 ,每个阶段均出现密集 -平静过程。 3、该震群可能与NE向潜山断裂的活动有关。 4、对咸宁震群的各种测震学参数计算表明 ,有一些参数在湖北省比较适用 (如b ,η ,U ,K ,ρ等 ) ,而有些则不适合 (如h ,F 等 )。

From the end of July to August in 1993, the earthquake ( M L=4.1) swarm occured in Xianning, Hubei, it is a typical sensible earthquake series. Through analysis and process in different seismographic ways, following knowledge and results can be obtained: The first, Xianning earthquake swarm is a non precursor earthquake swarm. The second, it is a main shock type swarm. The earthquakes had taken place mainly in two phases, each phase has the character of from denseness to silence. The third, it is related possibly to activity of Qianshan fault in N E direction. The fourth, by calculating all kinds of seismographic parameters of Xianning earthquake swarm, it is shown that some parameters (such as b, η,U,K,ρ .etc) are applicable in Hubei, but some are not suitable (such as, h, F. etc).