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小金地震序列的震源区应力场
引用本文:刁桂苓,程万正.小金地震序列的震源区应力场[J].中国地震,1995,11(2):168-173.
作者姓名:刁桂苓  程万正
作者单位:天津市地震局,四川省地震局,河北省地震局
摘    要:用P波和S波最大振幅比方法测定了1980年9月22日小金Ms6.6级地震前后的117个小震的震源机制。根据小金地震序列中3次最大地震和117个小震震源机制解,了震源区应力场的基本特征的变化形态。对小震机制解进行系统聚类分析,小震机制解的优势取向和3次最大地震的震源机制一致。由小震机制主要类型的平均解和3次最大地震的震源机制反演得到的应力场方向与区域应力场相符。和主震相近的优势走滑类型及逆倾滑动类型

关 键 词:应力场  震源机制  聚类分析  地震序列  震源区

The Stress Field in Source Region of the Xiaojin Earthquake Sequence in Sichuan
Diao Guiling.The Stress Field in Source Region of the Xiaojin Earthquake Sequence in Sichuan[J].Earthquake Research in China,1995,11(2):168-173.
Authors:Diao Guiling
Abstract:The focal mechanisms of 117 small events before and after the earthquake with Ms6. 6 on September 22, 1989 in Xiaojin region were determined by means of P and S maximum amplitude ratio. On the basis of the focal mechanisms of the 117 small events and 3 strongest events in the Xiaojin sequence, the general characteristics and variations of the stress field in source region were discussed. The focal mechanisms of the small events were analysed by hiearachical clustering method and it was found that dominant orientation of them are approximate to that of the focal mechanisms of the 3 strongest events. The directions of the stress field reversed from the average solutions of main types of the small events and the focal mechanisms solutions of the 3 strongest events are corresponding to that of the regional stress field, The epicenters of the events with dominant strike-slip type approximate to that of the mainshock and reveal dip-slip type are distributed in a wide area inside and outside the source region, and that with other strike-slip type and normal dipslip type are within the aftershock region, It is inferred that the irregular changes of stress field of Xiaojin was only limited within the source region as a result of the simple tectonic sets in this region under the control of the strong pressure generated from the pushing of the India Ocean Plate.
Keywords:Steess fiele  Focal mechanism  Hierarchical clustering analysis  
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