长岛地区构造环境剪应力场的分布特征
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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 Shandong 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 result shows that the shear stress τ is increasing with the moment magnitude ML,and by fitting τ and ML,the authors can get the simple relationship between them,that is τ = 1.89 ML-1.76.In the study area,the tectonic ambient shear stress τ is between 1.0 to 6.0 MPa.It is consistent with the results in Chen Peishan's article,which shows that the τ value is between 4 to 8 MPa which magnitudes are 3.0 to 5.5.
Based on the digital observation data recorded by the seismological digital seismic network of Shandong 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 result shows that the shear stress τ is increasing with the moment magnitude ML,and by fitting τ and ML,the authors can get the simple relationship between them,that is τ = 1.89 ML-1.76.In the study area,the tectonic ambient shear stress τ is between 1.0 to 6.0 MPa.It is consistent with the results in Chen Peishan's article,which shows that the τ value is between 4 to 8 MPa which magnitudes are 3.0 to 5.5.
引文
[1]陈培善,S.J.Duda.峰值速度和加速度对环境剪应力场的依赖性[J].地球物理学报,1993,36(2):185-194.
[2]陈培善,肖磊,白彤霞,等.唐山地震序列的环境应力场[J].地震学报,1994,16(4):440-447.
[3]陈培善,陈通海.由环境应力值寻找地震危险区的尝试[J].地震地磁观测与研究,1992,13(6):1-11.
[4]姜长宁,周加新.江苏及近海地区构造环境剪应力场的研究[J].地震地磁观测与研究,2002,22(1):53-58.
[5]Atkinson G.M.,Mereu R.F.The shape of ground motion attenuation curves in southeastern Canada[J].Bull Seism Soc Amer,1992,82:2014-2031.
[6]陆汉鹏,佟瑞清,韩海华,等.胶东测区重力场时空动态演化特征[J].高原地震,2010,22(2):32-38.
[7]毕青,沈坤,续外芬,等.滇西南地震活动特征分析[J].高原地震,2010,22(1):10-16.
[8]赵金花,陆汉鹏,许萍,等.2009年度山东及邻近地区地震波速比变化特征分析[J].高原地震,2010,22(1):6-9.
[2]陈培善,肖磊,白彤霞,等.唐山地震序列的环境应力场[J].地震学报,1994,16(4):440-447.
[3]陈培善,陈通海.由环境应力值寻找地震危险区的尝试[J].地震地磁观测与研究,1992,13(6):1-11.
[4]姜长宁,周加新.江苏及近海地区构造环境剪应力场的研究[J].地震地磁观测与研究,2002,22(1):53-58.
[5]Atkinson G.M.,Mereu R.F.The shape of ground motion attenuation curves in southeastern Canada[J].Bull Seism Soc Amer,1992,82:2014-2031.
[6]陆汉鹏,佟瑞清,韩海华,等.胶东测区重力场时空动态演化特征[J].高原地震,2010,22(2):32-38.
[7]毕青,沈坤,续外芬,等.滇西南地震活动特征分析[J].高原地震,2010,22(1):10-16.
[8]赵金花,陆汉鹏,许萍,等.2009年度山东及邻近地区地震波速比变化特征分析[J].高原地震,2010,22(1):6-9.
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