南北地震带形变场动态演化与地震活动参数图象综合对比研究

利用南北地震带及附近地区２０ 多年来的大地垂直形变资料， 结合区域地震活动资料， 初步分析归纳了大地形变时空分布与地震群体活动的关系。在此基础上， 进一步对南北地震带中南段之川滇菱形块体形变场中期动态演化图象与ｂ 值等地震活动参数图象进行了综合对比分析， 研究了形变场动态演化所揭示的区域现今构造运动的时空差异与反映地壳介质结构特性的ｂ 值的时空分布变化、强震前后地震非均匀度值分布变化以及地震空区等的关系。结果表明： 强震前区域形变场动态演化与地震活动参数的时空分布均具有一定的非均匀特征， 二者所反映的大区域应力场变化与介质结构的不均匀导致的强烈差异运动产生的应变能积累是强震孕育的主要原因。得出了一些利用大地形变场动态演化与地震活动参数图象相结合进行强震中期预测的有益结果。

Comparative analysis between dynamic evolution of deformation field and seismicity pattern around north-south tectonic belt in China

Based on the leveling observation data about 20 years and the seismicity information around the north south tectonic belt in China,the relationship between the deformation field distribution and the activity patterns of earthquake swarm is analyzed and induced Relied on its relationship in the time and the space,the rhombus block of Sichuan Yunnan that is the middle south part of North south tectoic belt and the parameter pictures of earthquake b value are furthermore researched At the same time,the present differences of regional tectonic movement in the time and in space are drawn out The distribution of earthquake b value in time and space that reflects the characteristics of the crust medium construct is displayed as well The relationship between the heteropic degree distribution before or after an earthquake and the seismic gaps is discussed The distribution of dynamic evolution of regional deformation before a strong earthquake is not heteropical And the dynamic seismicities distribution is not heteropical as well The big stress field changes and results in the heteropical distrbutions At last it results in the extensive movements with different rates This will result in the accumulation of stress and at last result in the earthquakes So same useful conclusions can be got from discussion above