云南地区强震前孕震系统的非线性阶段  

A NONLINEAR STEP OF SEISMOGENIC SYSTEM BEFORE A STRONG EARTHQUAKE IN YUNNAN REGION

作　　者：蔡静观[1] 许昭永[1] 赵洪声[1] 

机构地区：[1]云南省地震局,昆明650041

出　　处：《地震研究》1993年第4期329-337,共9页Journal of Seismological Research

基　　金：地震科学联合基金

摘　　要：本文以降维减熵增能的地震学方法,讨论了强震前复杂孕震系统的非线性阶段,云南地区1976年以来6级以上的强震震例表明,强震前复杂孕震系统的非线性阶段是普遍存在的。但从不同震例。不同方法反映出来的非线性阶段起始时间是有差异的,本文进行了综合判断的尝试,得出孕震系统在强震前1～3年进入非线性阶段。结果还表明,蠕变曲线和累计频度的速率增加比具有普适的特点,前者为2.4左右,后者为1.7左右。A nonlinear step of complicated seismogenic system before a strong earthquake has been discussed through the seismological technique of dimension-lowering, entropy-decreasing and energy-increasing. The studies of strong earthquakes with M= 6 from 1976 up to now show that there commonly exist a nonlinear step of complicated seismogenic system before a strong earthquake, however, starting time of nonlinear step is different from the studies of different earthquakes and methods. In this paper, a trial of comprehensive judgement has been used that seismogenic system has entered into nonlinear step from 1 to 3 years before a strong earthquake occurrence. The result also shows that ratio of speed increments 2.4 for creep curve and 1.7 for accumulated frequency has common features.

关 键 词：云南 地震 孕震系统 非线性阶段 

分 类 号：P315.5[天文地球—地震学]