华北中部地区重力场时空动态演化特征

以2009—2013年获取的9期流动重力资料为基础,系统分析华北中部地区的重力测量资料,研究重力场的时空动态演化特征。资料显示华北中部地区重力异常变化十分剧烈,整个测区呈现大面积负值变化,在局部地区形成重力变化梯度带。重力场变化与断裂活动密切相关,近期出现的反向变化表明该地区地震危险性进一步加大,这对地震预报工作具有重要的现实意义。

Time-space Dynamic Evolution Characteristics of a Gravity Field in the Middle Area of North China

Employing the mobile gravity data from 2009 to 2013 as the foundation,mobile gravity observation data of the middle region of North China from 2009 to 20l3 were analyzed,and time-space dynamic evolution characteristics of the gravity field were studied.The change of the gravity field is closely related to the tectonics of active faults.The resulting gravity data showed that the changes in gravity anomalies in North China are severe.In the northern portion of the Shanxi graben zone,centered at the border region in Shanxi,Hebei, and Inner Mongolia,the gravity variation showed a large area of negative anomalies.The entire survey area showed a large area of negative changes in the local area with a gravity gradient formation,which reversed the recent changes,indicating a further increase in regional seismic hazards.This potential guide to earthquake prediction has important practical significance.