华北中部地区重力场时空动态演化特征  

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

作　　者：罗翔飞[1] 秦建增[1] 李真[1] 谢汝一[1] 冯建林[1] 

机构地区：[1]中国地震局地球物理勘探中心,河南郑州450002

出　　处：《地震工程学报》2015年第3期687-692,共6页China Earthquake Engineering Journal

基　　金：地震行业科研专项(201208009):自然基金(41274113)

摘　　要：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。Employing the mobile gravity data from 2009 to 2013as the foundation,mobile gravity observation data of the middle region of North China from 2009 to 20l3were analyzed,and timespace 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.

关 键 词：重力场 华北中部地区 地震活动 构造活动 

分 类 号：P315.726[天文地球—地震学]