应用地震学方法研究中国大陆活动地块应力应变场

在中国大陆活动地块假说及活动边界研究的基础上，将中国大陆按照地震活动特征进行分区. 利用大地震的震源机制资料和历史强震资料，结合小震综合节面解，研究了各地震区的应力应变状态，给出了各地震区的平均应力主轴方向和平均应变率. 应用地震应变能积累释放模型研究了各地震区的地震活动水平. 结果表明最大剪切应变率与地震活动水平存在线性关系. 将地震资料给出的中国大陆地壳应力应变场与GPS测量给出的结果进行了比较，初步说明了两种结果存在着统一性，从而显示出活动地块运动变形与强震活动的内在联系.

STRESS AND STRAIN FIELDS OF ACTIVE TECTONIC BLOCKS IN THE CHINA MAINLAND DEDUCED BY SEISMOLOGICAL METHODS

The sub-regions are delineated for the seismicity of Chinese mainland based on the hypothesis of active tectonic block and researches on active boundaries. On this result, the mean principal stress axes and average strain rates of each sub-regions are deduced from focal mechanism solutions and historical major earthquake data, combined with composite plane solutions of small earthquakes. The seismicities of each sub-region are studied using the strain accumulating and releasing model. The results show that seismicities and mean shear strain rates of each sub-region fit a linear relation. The stress and strain results derived from earthquake data and those results deduced from GPS survey are compared. The comparability shows these two kinds of results are coherent, and also indicates that there are internal relations between the movement and deformation of active tectonic blocks and their seismic activity.