新疆天山中部重力场时空变化特征研究  

Research on the Temporal-Spatial Variation Characteristic of Gravity Field in the Central Tianshan,Xinjiang

作　　者：刘代芹[1] 朱治国[1] 王晓强[1] 李杰[1,2] 李桂荣[1] 方伟[1] 

机构地区：[1]新疆维吾尔自治区地震局,新疆乌鲁木齐830011 [2]中国地质大学空间科技应用研究中心,湖北武汉430070

出　　处：《地震研究》2012年第4期506-513,597,共8页Journal of Seismological Research

基　　金：新疆维吾尔自治区自然科学基金(2012211B56);新疆维吾尔自治区科学研究与技术开发攻关计划(200741121);地震科技星火计划项目(XH1030);新疆地震科学基金(201117)联合资助

摘　　要：利用1987～2011年新疆地区的流动重力资料,对多期数据进行统一起算基准平差计算,绘制出新疆天山中部地区区域测段段差时序变化图、测线重力变化剖面图以及乌鲁木齐地区的重力场变化等值线图,并结合地震地质构造背景,分析新疆天山中部重力场变化特征。研究结果显示:独山子、宁家河测区重力变化较大,异常变化比较明显;乌鲁木齐地区相对稳定,空间分布比较集中,重力场正负变化区交替出现,重力场变化不大,能量正处于积累的过程。Using adjustment calculation with the uniform starting datum on the 50 terms of mobile gravity data from 1987 to 2011 in Xinjiang, we obtained the isoline map of gravity field in Urumqi and its surrounding areas, time-series curve of gravity difference of different measuring segment, profiles of gravity variation in three meas- uring line in the central Tianshan, Xinjiang. Combined with seismogeology tectonic background, we analyzed the gravity field variations of the central Tianshan in Xinjiang. The results showed that the spatial distribution of gravity was more centralized and the positive gravity variation areas alternated with the negative ones in Urumqi and its surrounding area. There was little change in the gravity field and the energy was in accumulation, which indicated that Urumqi and its surrounding areas were the medium and small earthquake-prone areas. The gravity was negative which varied largely in Dushanzi and Ningjiahe measuring area, which showed that curst was uplif- ting and the material density decreased continuously in these two measuring areas.

关 键 词：新疆天山 流动重力资料 重力场变化 Kring插值法 

分 类 号：P315.726[天文地球—地震学]