摘要
对2011年4月炉霍Ms5.3和11月青川-文县Ms5.4地震前重力场动态演化特征的研究结果表明:震前重力场变化经历了上升-加速上升-减速上升的过程;震前,鲜水河断裂带、安宁河-则木河断裂带和龙门山断裂带交汇区域重力场为正值的、密集的、闭合的等值线异常区。
Dynamic evolution characteristics of the gravity field before Luhuo Ms5.3 on April 10,2011 and Qingchuan-Wenxian Ms5.4 on November 1,20l 1 are studied. The result shows that the up-speed up-speed down variations of the gravity field emerged before those earthquakes. The variations of the gravity field formed dense, pos- itive anomaly and closed contours in the place where it is the intersection of Xianshuihe, Longmensan and An＇ ning- he faults.
出处
《大地测量与地球动力学》
CSCD
北大核心
2012年第6期37-40,49,共5页
Journal of Geodesy and Geodynamics
基金
四川省地震局专项(2200450)
关键词
重力场
动态演化特征
地震
断裂交汇区
等值线
gravity field
dynamic evolution characteristics
earthquake
intersection of faults
contours
