由多个震源机制解分析甘肃及边邻地区应力场特征
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摘要
基于震源断层面解的空间取向和断层滑动方向,由相应力轴张量在地理坐标系中的表达式,通过坐标旋转、代数平均可求得多个震源机制解的P、B、T轴参数的平均应力场。据甘肃及边邻地区的分区活动特征,将研究地区分为8个小区域,由各个区域内多个地震震源机制解,采用力轴张量计算法,得到了各个区应力张量的定量分析结果。
Based on the spatial orientation and slip direction of the fault plane solutions, by means of the expression of corresponding mechanical axis tensor in geographic coordinate system and the coordinate circumrotating and algebra average, we deduced the mean stress field from P, B and T axes parameters of a number of focal mechanism solutions. According to the subarea activity characteristics of Gansu and its adjacent region, the region concerned is divided into eight small areas. From a number of focal mechanism solutions in every area, adopting the method of mechanical axis tensor, we presented the quantitative analysis results of the stress tensor in each area.
Based on the spatial orientation and slip direction of the fault plane solutions, by means of the expression of corresponding mechanical axis tensor in geographic coordinate system and the coordinate circumrotating and algebra average, we deduced the mean stress field from P, B and T axes parameters of a number of focal mechanism solutions. According to the subarea activity characteristics of Gansu and its adjacent region, the region concerned is divided into eight small areas. From a number of focal mechanism solutions in every area, adopting the method of mechanical axis tensor, we presented the quantitative analysis results of the stress tensor in each area.
引文
[1]许忠淮,戈澍谟.用滑动方向拟合法反演富蕴地震断裂带应力场[J].地震学报,1984,6(4):395-404.
[2]许忠淮.用滑动方向拟合法反演唐山余震区的平均应力场[J].地震学报,1985,7(4):349-361.
[3]Gephart J W,Forsyth D W..An improved method for determining the regional stress tensor using earthquake focal mechanism data:Application to the San Fernand earthquake sequence[J].J Geop hys Res,1984,89:9305-9320.
[4]崔效锋,谢富仁.利用震源机制解对中国西南及邻区进行应力分区的初步研究[J].地震学报,1999,21(5):513-522.
[5]钟继茂,程万正.由多个地震震源机制解求川滇地区平均应力场方向[J].地震学报,2006,28(4):337-346.
[6]许力生,陈运泰,高孟潭.2001年1月26日印度古杰拉特(Gujarat)MS7.8级地震时空破裂过程[J].地震学报,2002,24(5):447-461.
[7]袁道阳,何文贵,刘小凤,等.10余年来甘肃省中强地震的发震构造特征[J].西北地震学报,2006,28(3):235-241.
[8]谢富仁,崔效锋,赵建涛,等.中国及邻区震源机制解的分区特征[J].地震地质,2005,27(2):298-305.
[2]许忠淮.用滑动方向拟合法反演唐山余震区的平均应力场[J].地震学报,1985,7(4):349-361.
[3]Gephart J W,Forsyth D W..An improved method for determining the regional stress tensor using earthquake focal mechanism data:Application to the San Fernand earthquake sequence[J].J Geop hys Res,1984,89:9305-9320.
[4]崔效锋,谢富仁.利用震源机制解对中国西南及邻区进行应力分区的初步研究[J].地震学报,1999,21(5):513-522.
[5]钟继茂,程万正.由多个地震震源机制解求川滇地区平均应力场方向[J].地震学报,2006,28(4):337-346.
[6]许力生,陈运泰,高孟潭.2001年1月26日印度古杰拉特(Gujarat)MS7.8级地震时空破裂过程[J].地震学报,2002,24(5):447-461.
[7]袁道阳,何文贵,刘小凤,等.10余年来甘肃省中强地震的发震构造特征[J].西北地震学报,2006,28(3):235-241.
[8]谢富仁,崔效锋,赵建涛,等.中国及邻区震源机制解的分区特征[J].地震地质,2005,27(2):298-305.
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