云南地区地震序列早期地震波动力学特征  

THE EARLY DYNAMICAL CHARACTERISTICS OF SEISMIC WAVE OF EARTHQUAKE SEQUENCES IN YUNNAN REGION

作　　者：蔡静观[1] 雷素华[1] 王兴辉[1] 张喜玲[1] 

机构地区：[1]云南省地震局,中国昆明650041

出　　处：《地震》1996年第2期159-167,共9页Earthquake

基　　金：国家地震局"八五"重点项目85-04-03-01

摘　　要：研究了云南地区各类型地震序列的早期地震波动力学特征——地震波垂直分量P波初动和P、S波最大振幅比,结果表明:前震序列振幅比为过原点的直线,比值稳定,P波初动一致;双震型地震序列在第一主震后P波初动出现一组时,仍有一类波形(“大头波”或“小头波”)的振幅比保持为过原点的直线,第一主震后P波初动出现两组时,仍有初动相同的一组地震振幅比保持为过原点的直线,或者两组初动的地震振幅比分别、共同成过原点的直线;主余震地震序列在非大震孕育期间,地震振幅比离散,与大震孕育有关的主余震地震序列振幅比仍可为过原点的直线。地震波动力学特征在上述三类地震序列的早期判断能力分别为75％、55％—73％、90％。In this paper, the early dynamical characteristics of seismic wave of earthquake sequences in Yunnan Region, the first motion of P-wave and amplitude ratio of P- and S-waves of vertical component have been studies. The results show that amplitude ratio of foreshock sequences is a straight line through the origin, the ratio value remains stable and the first motion of P-wave is identical; For double event sequences, when the first motion of P-wave is identical after first main earthquake, the amplitude ratio of a group of waves form ( AP > As or As > AP ) still keeps a straight line; When the first motion shows two groups, the amplitude ratio which has same first motion is a stright line or the amplitude ratio consists two different stright lines or only one stright line; During the strong earthquake preparation the amplitude ratio of the main-after shock sequences is a stright line throngh the origin and others are scattered. The early-stage judgement capability as dynamical characteristics of seismic wave are 75%, 55%-73%, 90% respectively for three types of earthquake sequences.

关 键 词：振幅比 前震序列 地震波 动力学 云南地区 

分 类 号：P315.3[天文地球—地震学]