摘要
对丽江地区 7.0级地震前 3a内发生的 16 0 5个中小震发震时震源处的潮汐体应力进行了计算 ,按时间进程统计了震源在潮汐体应力的压、张作用下发生的地震所释放能量的平方根的比值 (潮汐体应力压张地震比 ) ,得到了 7.0级大震前丽江地区地震序列在潮汐体应力压张地震比随时间的变化过程 .结果表明 ,在 7.0级丽江大震前的 2a多时间内 ,潮汐体应力压张地震比一直高于 1,距大震前半年开始剧烈升高 ,临震时达到最大 .
Tidal body stress at focus points of 1?605 middle and small earthquakes which took place during three years at Lijiang area before M 7.0 shock Feb.3,1996 are calculated.Statistics about the ratio of the square root of seismic energy related with tidal compression to that of seismic energy related with tidal extension are made on time course.Patterns of the ratio variation with time of the earthquake sequence at Lijiang area before the M 7.0 shock are obtained.The result indicates that the value of the ratio was higher than 1 during the time of more than two years before the M 7.0 shock,and began to go up severely at the time six months before the big shock,and reached the maximum just before the shock.
出处
《云南大学学报（自然科学版）》
CAS
CSCD
2000年第2期116-119,共4页
Journal of Yunnan University(Natural Sciences Edition)
关键词
丽江
地震序列
潮汐体应力压张地震比
云南
tidal body stress
Lijiang earthquake sequence
tidal compression-extension earthquake ratio
Yunnan
