长岛地区构造环境剪应力场的分布特征  

CHARACTERISTICS OF STRUCTURAL SHEARING STRESS FIELD DISTRIBUTION IN CHANGDAO AREA

作　　者：张志慧[1] 王帅合[1] 李亚军[1] 董晓娜[1] 李霞[1] 山长仑[1] 

机构地区：[1]山东省地震局,山东济南250014

出　　处：《高原地震》2011年第4期31-36,共6页Plateau Earthquake Research

基　　金：山东省地震局合同制项目(08Q09)资助

摘　　要：利用山东数字地震台网记录资料,根据陈培善等用地震发生的断裂力学模式和震源谱理论,导出的震源处峰值加速度与构造环境剪应力值的关系,计算了山东长岛地区发生的中小地震构造环境剪应力值,并对应力场的分布状况和时空变化进行了分析。结果表明:剪应力τ值随矩震级(ML)的增大而增大,对两者作拟合得到它们之间较简单的关系为:τ=1.89 ML-1.76。在所研究的区域范围内,其构造环境剪应力τ值为1.0～6.0兆帕,与陈培善对3.0～5.5级地震的τ值多在4～8兆帕之间这一统计结果基本一致。Based on the digital observation data recorded by the seismological digital seismic network of Shan-dong Province, rupture mechanics model and seismic focus theory by CHEN Peishan, this paper educes the relation between peak value acceleration and structural shearing stress value, calculates the stress value from earthquakes occurred in Changdao area, and analyzes the time and space distribution characteristics of stress field. The resuh shows that the shear stress r is increasing with the moment magnitude ML, and by fitting r and ME, the authors can get the simple relationship between them, that is r = 1.89 ML - 1- 76. In the study area, the tectonic ambient shear stress r is between 1.0 to 6. 0 MPa. It is consistent with the results in Chen Peishan＇ s article, which shows that the r value is between 4 to 8 MPa which magnitudes are 3.0 to 5.5.

关 键 词：峰值加速度 环境剪应力值 山东数字地震台网 

分 类 号：P315.23[天文地球—地震学]