摘要
利用河西地区重力复测资料,研究了2003年10月25日甘肃省民乐县东南部Ms6.1和Ms5.8地震前后重力场的演化。结果表明,震前震中附近出现了重力减小的现象,沿活动断裂有重力高梯度带产生;震后重力场松驰反向恢复。重力变化图像较清晰地反映了重力场由准均匀态地震孕育的非均匀态发震松驰恢复的演化过程。
On the basis of the mobile gravity data of Hexi area, the characters of gravity field variation before and after Minle Ms6.1 ,Ms5.8 earthquakes are analyzed. Before the earthquake, the results show that the gravity field decreased nearby the epicenter and a high gravity gradient belt occured along the active fault. After the earthquake, the gravity field relaxed and resumed inversely. The dynamic patterns of gravity field mirrored the evolution process of gravity field：quasi-homogeneous state--non-homogeneous state--earthquake occurence--relax and resumption.
出处
《大地测量与地球动力学》
CSCD
北大核心
2006年第3期59-64,共6页
Journal of Geodesy and Geodynamics
基金
中国地震局三结合课题
关键词
重力测量
重力变化
河西地区
民乐6.1地震
活动断裂
gravity observation, gravity variation, Hexi area, Minle Ms6.1 earthquake, active fault
