中国大陆及其邻区强震活动与活动地块关系研究

从活动地块假说出发 ,在活动地块研究的基础上 ,探讨了中国大陆及邻区活动地块与强震活动的关系。研究指出 ,主要构造变形和强烈地震大都发生在活动地块边界。在占总面积 17%的活动地块边界上 ,集中了全部的 8级以上巨大地震和 86 %的 7级以上大地震 ,其释放能量占全部总能量的 95 %以上 ,表明中国大陆及其邻区活动地块边界带控制了绝大部分的强地震。从活动地块的整体来看 ,强震活动不仅显示出显著的韵律性特征 ,而且其高、低起伏基本上与中国大陆地区一致 ,只是强震活跃时段有时稍长于中国大陆。各轮回强震活动都有各自活动的主体地区 ,反映了不同活跃期内地块的不同活动方式。文中还从现今地壳运动角度 ,讨论了活动地块运动速率与强地震活动水平之间的可能联系。

CORRELATION BETWEEN STRONG EARTHQUAKE ACTIVITY AND ACTIVE CRUSTAL-BLOCK IN CHINA MAINLAND AND ITS ADJACENT REGIONS

By the hypothesis of the active crustal-block and based on the research of the active crustal-block, the correlation between strong earthquake activity and active crustal-block, in China mainland and its adjacent regions, has been discussed in this paper. The results show that large tectonization and strong earthquakes mainly occur on the active crustal-block boundaries. All the huge earthquakes over M_s 8 and 86% strong earthquakes over M_s 7 cluster on the active crustal-block boundaries which only occupy 17% space of the whole area. The active crustal-block boundaries have controlled almost all the strong earthquakes in China mainland and its adjacent regions. In general, not only strong earthquake activity shows notable rhythm, but also the active and low phases are similar to those of China mainland. Sometimes, the active periods of strong earthquake in some cycles are longer than those of China mainland. The main areas of strong earthquake activity for each seismic cycle show that active crustal-block moves differently in different seismic cycle. Based on present crustal movement, the potential correlation between active crustal-block movement velocity and strong earthquake activity has been discussed.