摘要
本文定义地震的时空距D_(ST)和时空转换系数C为:D_(ST)~2=d^2+C^2(△t)~2,d为序列中连续发生的两次地震的空间距,△t为时间间隔。采用60年代来发生在我国5级以上有详细目录的地震序列23个,分别计算了主震后1天、2—3天,4—7天内C的平均值C_1,C_2,C_3,计算中取D_(ST)为相应时间段内地震空间距的最大值。结果表明:(1)若C_1>C_2>C_3,则无强余震发生;(2)若C_1≌C_2,或C_1<C_3,或C_2<C_3,则为震群型,或主震后仍有强余震发生;因此从主震后3天左右C值的变化,可以判断震后趋势。 本文初步讨论了D_(ST)及C值的物理含义。
In this paper time-space distance DST and time-space transfer coefficient C are defined as DST=d2+C2(Δt)2, where d is spatial distance of two epicenters, Δt is time interval of two events. By using 23 M> 5 earthquake sequences with detailed catalogue wich occurred in China since 1960', authors calculated the average C value C1,C3, C7, in 1 day, 2-3 days and 4-7 days after the mainshock respectively. In calculation, DST is taken as the maximum value of spatial distance in the corresponding time interval.The result shows that (1) if that C1 >C3 >C7, there is not strong after-shock;(2) if C1≌C3,or C1 <C3 or C3 <C7,the sequence will be swarm type, or there will be strong aftershocks after the mainshock. Therefore, by studying the C value change about 3 days after the mainshock, the post-seismic tendency can be determined.The physical significance of DST and C are preliminarily discussed.
出处
《地震》
CSCD
北大核心
1994年第1期31-35,共5页
Earthquake
关键词
时空转换系数
震后趋势
地震
调查
time-space distance
time-space transfer coefficient
post-seismic ten- dency
