华北地区2009～2013年地下物质密度变化及其地壳运动含义  

Subsurface Density Change in North China from 2009 to 2013 and Its Implication on Crustal Movements

作　　者：韩美涛[1] 玄松柏[2,3] 张永奇 曹建平[1] 郑增记[1] HAN Meitao XUAN Songbai ZHANG Yongqi CAO Jianping ZHENG Zengji(Shaanxi Earthquake Agency, 4 Shuiwen Lane,Xi＇an710068, China Key Laboratory of Earthquake Geodesy, Institute of Seismology, CEA,40 Hongshance Road, Wuhan 430071, China Laurel Geophysical Instruments Co Ltd （Shanghai）, 777 Longwu Road, Shanghai 200232, China)

机构地区：[1]陕西省地震局,西安市水文巷4号710068 [2]中国地震局地震研究所(地震大地测量重点实验室),武汉市洪山侧路40号430071 [3]北京劳雷物理探测仪器有限公司(上海),上海市龙吴路777号200232

出　　处：《大地测量与地球动力学》2017年第11期1118-1120,1135,共4页Journal of Geodesy and Geodynamics

基　　金：陕西省地震局启航与创新基金(201506;201514);中国地震局"三结合"课题(162704)~~

摘　　要：基于华北地区2009~2013年半年尺度重力复测资料,利用扣除半年和年周期获得的重力年变率反演计算华北地区地下物质密度变化。结果显示,华北地区总体上呈现东、西两侧的山西地区和渤海湾盆地为负变化,中间地带的华北平原表现为正变化,揭示了华北平原中下地壳因两侧膨胀和岩石圈热物质上涌而使物质处于压缩状态。The gravity change rate（GCR）,which is derived from repeated gravity data deducted the semi-annual and annual changes of the network of the north China,is used to inverse subsurfacial density change.The results show that the subsurfacial density change trends from negative（Shanxi region）,to positive（north China plain）,to negative（Bohai bay basin）,from west to east.It reveals that the middle and lower crust are in the compressed state caused by the extension of the Shanxi rift and the Bohai bay basin and the upwelling of the lithospheric hot material.

关 键 词：重力变化 趋势拟合 重力变化率 密度变化 反演 华北地区 

分 类 号：P312[天文地球—固体地球物理学]