关中地区重力场及其时空动态演化特征  

Study on Gravity Field and It's Dynamic Evolutional Characteristics in the Guanzhong Area

作　　者：胡斌[1] 祝意青[1] 田勤俭[2] 程宏宾[1] 

机构地区：[1]中国地震局第二监测中心,西安市西影路316号710054 [2]中国地震局地震预测研究所,北京100036

出　　处：《中国地震》2006年第2期172-181,共10页Earthquake Research in China

基　　金：地震联合基金(105051);<城市活断层>子项目<拉张区城市地震构造模型>联合资助

摘　　要：系统分析了关中地区1992～2004年流动重力测量资料,研究了重力场的时空动态演化特征。10多年来的重力场动态变化图象表明:重力场变化与活动断裂构造密切相关,重力场有规律的变化与区域应力-应变场微动态活动有关。区域重力场总的趋势变化为:关中南部秦岭山区重力负值变化,测区中部渭河断陷盆地至韩城一带重力正值变化,测区北部铜川-黄龙一带的渭北黄土塬重力负值变化。西安城区重力变化主要是过量开采地下水、含水系统压密所致。The mobile gravity data in the Guangzhong area is systemically analyzed, and dynamically evolutional characteristics in time and spatial domains of gravity field is researched. From the results we have had following understandings： （ 1 ） The change of gravity field is closely relative to tectonic of active fracture; （2）Lawly change of gravity may be relative to micro-dynamic situation of stress-strain field ; （3） The overall tend of regional gravity variation present negative in the Qinling mountain range, south of Guanzhong, and present positive in the zone of Weihe down faulted basin to Hancheng, middle part of Guanzhong, and present negative in the zone of Tongchuan to Huanglong, north of Guangzhong; （4）The main cause of the gravity variation in Xi＇an city is that groundwater has been over mined, thus, hydrous system is so pressed that ground gravity varies.

关 键 词：重力场演化 地壳运动 构造活动 地面下沉 关中地区 

分 类 号：P315[天文地球—地震学]