对华北地区1991年以来的流动重力观测资料进行了清理,并对1998年张北6.2级地震前后的重力场演化特征进行了分析。
A sorting work is carried out upon the repeated gravity data in the North China area from 1991, and by using the sorting results, gravity variation before and after the 1998 Zhangbei 6.2 earthquake is analyzed.