“霍山窗”地区现代构造应力场研究
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摘要
应用Snoke于2009年提出的利用P、SV和SH波的初动和振幅比联合计算震源机制解的方法,得到"霍山窗"地区1980年以来62次中小地震的震源机制解。基于大量的震源机制解资料,根据应力张量平均法反演得到"霍山窗"地区的平均构造应力场;结果表明,其与震源机制参数统计结果一致,表现为近EW向的水平挤压和近NS向的水平拉张作用。计算单个震源机制解力轴与平均应力场主应力轴的差异,即震源机制的一致性参数θ,进而分析θ随时间变化特征及其与华东地区中强震的关系;结果表明,"霍山窗"地区震源机制的一致性参数θ对华东地区相应中强震似有一定的指示意义。
The focal mechanisms of 62 moderate-small earthquakes since 1980 in the "Huoshan Seismic Window" region are calculated with the method developed recently by Snoke which combines the first motion of P,SV and SH waves with their amplitude ratios.Based on these abundant focal mechanisms,mean tectonic stress field in the "Huoshan Seismic Window" region is inverted with the method of average stress tensor.The result shows that the "Huoshan Seismic Window" region is horizontally compressed nearly in EW direction and horizontally dilated nearly in NS direction,which is in accordance with statistical results of focal mechanism parameters.We estimate the difference(also referred to as consistency parameter θ) between the force axis direction of focal mechanism solution and the mean stress tensor,then further analyze the variation characteristics of θ versus time,and the relationship with moderately strong earthquakes in the Eastern China region.The result indicates that θ in the "Huoshan Seismic Window" region are in good correspondence with moderately strong earthquakes in the Eastern China region.When θ is lower than the mean value,corresponding moderately strong earthquakes may occur in the Eastern China region.
The focal mechanisms of 62 moderate-small earthquakes since 1980 in the "Huoshan Seismic Window" region are calculated with the method developed recently by Snoke which combines the first motion of P,SV and SH waves with their amplitude ratios.Based on these abundant focal mechanisms,mean tectonic stress field in the "Huoshan Seismic Window" region is inverted with the method of average stress tensor.The result shows that the "Huoshan Seismic Window" region is horizontally compressed nearly in EW direction and horizontally dilated nearly in NS direction,which is in accordance with statistical results of focal mechanism parameters.We estimate the difference(also referred to as consistency parameter θ) between the force axis direction of focal mechanism solution and the mean stress tensor,then further analyze the variation characteristics of θ versus time,and the relationship with moderately strong earthquakes in the Eastern China region.The result indicates that θ in the "Huoshan Seismic Window" region are in good correspondence with moderately strong earthquakes in the Eastern China region.When θ is lower than the mean value,corresponding moderately strong earthquakes may occur in the Eastern China region.
引文
[1]刘东旺,2006,安徽地震台网区域S波波速结构及与地震关系研究(私人通信)
陈颙,1980,用震源机制一致性作为描述地震活动性的新参数,地球物理学报,2(3),39～47。
陈宇卫、张军、庆梅等,2007,“霍山地震窗”小震序列运动学参数时变特征研究,地震,27(1),26～32。
程万正、刁桂苓、吕弋培等,2003,川滇地块的震源力学机制、运动速率和活动方式,地震地质,25(1),71～87。
程万正、阮祥、张永久,2006,川滇次级地块震源机制解类型与一致性参数,地震学报,28(6),561～573。
刁桂苓、于利民、李钦祖,1992,震源机制解的系统聚类分析——以海城地震序列为例,中国地震,8(3),86～92。
刁桂苓、赵英萍,2004,大同晚期强余震前震源机制解的一致性特征,内陆地震,18(3),202～206。
阚荣举、张四昌、晏凤桐等,1977,我国西南地区现代构造应力场与现代构造活动特征的探讨,地球物理学报,20(2),96～107。
李钦祖、王泽皋、贾云年等,1973,由单台小地震资料所得两个区域的应力场,地球物理学报,5(3),68～279。
梁尚鸿、李幼铭、束沛镒等,1984,利用区域地震台网P、S振幅比资料测定小震震源参数,地球物理学报,27(3),249～256。
刘东旺、刘泽民、沈小七等,2004,安徽淮河构造变形带及邻近块体现代构造应力场特征,中国地震,20(4),364～371。
刘泽民、刘东旺、李玲利等,2011,利用多个震源机制解求东大别地区平均应力场,地震学报,33(5),605～613。
倪红玉、刘泽民、沈小七等,2011,利用FOCMEC方法震源机制解的影响因素分析,华北地震科学,29(3),1～7。
夏瑞良,1985,安徽区域地震应力场的分布特征,地震地质,7(3),13～21。
姚大全、张杰、沈小七,2006,安徽霍山地区断层活动习性研究的新进展,地球物理学进展,21(3),776～782。
许忠淮,1985,用滑动方向拟合法反演唐山余震区的平均应力场,地震学报,7(4),349～361。
泽仁志玛、刁桂苓、李志雄等,2010,大震前显示的地震震源机制趋于一致的变化,地震,30(1),108～114。
郑兆苾、庆梅、李敏莉,1999,霍山窗与华东中强震关系研究,地震学刊,19(2),1～9。
钟继茂、程万正,2006,由多个地震震源机制解求川滇地区平均应力场方向,地震学报,28(4),337～346。
Kisslinger C,Bowman J R,Koch K,1981,Procedures for computing focal mechanisms from local(SV/P)z data,Bull Seis SocAmer,71(6),1719～1730.
Snoke J A,Munsey J W,Teague A G,et al,1984,A program for focal mechanism determination by combined use of polarity andSV-P amplitude ratio data,Earthquake Notes,55(3),15～20.
Snoke J A,1989,Earthquake mechanisms,Encyclopedia of Geophysics(D E James,Ed),Van Nostrand Reinhold Company,New York,239～245.
Snoke J A,2009,Traveltime Tables for iasp91and ak135,Seism Res Letters,80(2),260～262.
Zoback M L,1992,Stress field constrations on intraplate seismictiy in eastern north America,J Geophys Res,97(B8),11761～11782.
陈颙,1980,用震源机制一致性作为描述地震活动性的新参数,地球物理学报,2(3),39～47。
陈宇卫、张军、庆梅等,2007,“霍山地震窗”小震序列运动学参数时变特征研究,地震,27(1),26～32。
程万正、刁桂苓、吕弋培等,2003,川滇地块的震源力学机制、运动速率和活动方式,地震地质,25(1),71～87。
程万正、阮祥、张永久,2006,川滇次级地块震源机制解类型与一致性参数,地震学报,28(6),561～573。
刁桂苓、于利民、李钦祖,1992,震源机制解的系统聚类分析——以海城地震序列为例,中国地震,8(3),86～92。
刁桂苓、赵英萍,2004,大同晚期强余震前震源机制解的一致性特征,内陆地震,18(3),202～206。
阚荣举、张四昌、晏凤桐等,1977,我国西南地区现代构造应力场与现代构造活动特征的探讨,地球物理学报,20(2),96～107。
李钦祖、王泽皋、贾云年等,1973,由单台小地震资料所得两个区域的应力场,地球物理学报,5(3),68～279。
梁尚鸿、李幼铭、束沛镒等,1984,利用区域地震台网P、S振幅比资料测定小震震源参数,地球物理学报,27(3),249～256。
刘东旺、刘泽民、沈小七等,2004,安徽淮河构造变形带及邻近块体现代构造应力场特征,中国地震,20(4),364～371。
刘泽民、刘东旺、李玲利等,2011,利用多个震源机制解求东大别地区平均应力场,地震学报,33(5),605～613。
倪红玉、刘泽民、沈小七等,2011,利用FOCMEC方法震源机制解的影响因素分析,华北地震科学,29(3),1～7。
夏瑞良,1985,安徽区域地震应力场的分布特征,地震地质,7(3),13～21。
姚大全、张杰、沈小七,2006,安徽霍山地区断层活动习性研究的新进展,地球物理学进展,21(3),776～782。
许忠淮,1985,用滑动方向拟合法反演唐山余震区的平均应力场,地震学报,7(4),349～361。
泽仁志玛、刁桂苓、李志雄等,2010,大震前显示的地震震源机制趋于一致的变化,地震,30(1),108～114。
郑兆苾、庆梅、李敏莉,1999,霍山窗与华东中强震关系研究,地震学刊,19(2),1～9。
钟继茂、程万正,2006,由多个地震震源机制解求川滇地区平均应力场方向,地震学报,28(4),337～346。
Kisslinger C,Bowman J R,Koch K,1981,Procedures for computing focal mechanisms from local(SV/P)z data,Bull Seis SocAmer,71(6),1719～1730.
Snoke J A,Munsey J W,Teague A G,et al,1984,A program for focal mechanism determination by combined use of polarity andSV-P amplitude ratio data,Earthquake Notes,55(3),15～20.
Snoke J A,1989,Earthquake mechanisms,Encyclopedia of Geophysics(D E James,Ed),Van Nostrand Reinhold Company,New York,239～245.
Snoke J A,2009,Traveltime Tables for iasp91and ak135,Seism Res Letters,80(2),260～262.
Zoback M L,1992,Stress field constrations on intraplate seismictiy in eastern north America,J Geophys Res,97(B8),11761～11782.
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