天津地区的水平应变场特征
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摘要
根据1995—1999年、1999—2004年和2004—2009年天津地区GPS站点观测资料,分不同地块计算了主应变率和断裂带的差异应变率。在此基础上研究了天津地区应变场和断层应变。结果显示,天津地区整体由主应变方向揭示的主压应力方向,前两个时段为北西向,后一个时段为北东东向;次级小块体的主压应力方向变化较大;块体边界断裂有的成为应变梯度带,有的不明显;断裂带的差异应变率在不同时段,差别显著;地震活动与高应变带、应变梯度带、断裂带的差异应变率较大的地段有一定的关系。
On the basis of the observations from Tianjin GPS site during 1995-1999,1999-2004 and 2004-2009,the principal strain rate and the difference of strain rate of fault zone were calculated for different blocks.The results show that the principal compressive stress direction of the overall Tianjin was the NW direction in the first two periods,the NEE direction in the last period,which is revealed by the direction of principal strain.The principal compressive stress direction of secondary small block changes considerably.Some of faults in block boundaries have become strain gradient zone,while the others are not obvious.The differences between the differential strain rate of fault zone are significant in different periods.Seismic activity has a certain relationship with high strain zone,strain gradient zone,and the zone with higher differential strain rate of fault zone.
On the basis of the observations from Tianjin GPS site during 1995-1999,1999-2004 and 2004-2009,the principal strain rate and the difference of strain rate of fault zone were calculated for different blocks.The results show that the principal compressive stress direction of the overall Tianjin was the NW direction in the first two periods,the NEE direction in the last period,which is revealed by the direction of principal strain.The principal compressive stress direction of secondary small block changes considerably.Some of faults in block boundaries have become strain gradient zone,while the others are not obvious.The differences between the differential strain rate of fault zone are significant in different periods.Seismic activity has a certain relationship with high strain zone,strain gradient zone,and the zone with higher differential strain rate of fault zone.
引文
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5张跃刚,等?从GPS观测看华北地区的形变场演化[J].大地测量与地球动力学,2006,(1):36-41.(ZhangYuegang,et al.Study on evolution of deformation field inNorth China area with GPS data[J].Joumal of Geodesy andGeodynamics,2006,(1):36-41)
6杨国华,韩月萍,周晓燕.华北地壳运动新特征[J].大地测量与地球动力学,2002,(3):28-33.(Yang Guo-hua,Han Yueping and Zhou Xiaoyan.Newfeatures of crus-tal motion in North China[J].Joumal of Geodesy and Geo-dynamics,2002,(3):28-33)
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