三峡坝区深部界面重力反演  

GRAVITY INVERSION OF DEEP INTERFACES IN THREE GORGES DAM REGION

作　　者：汪健[1,2] 申重阳[1,2] 李辉[1,2] 肖凡[3,4] 刘晓玲[5] 

机构地区：[1]中国地震局地震研究所(地震大地测量重点实验室) [2]中国地震局地壳应力研究所武汉创新基地 [3]61365部队 [4]解放军信息工程大学测绘学院 [5]湖北省测绘局

出　　处：《大地测量与地球动力学》2012年第5期6-11,共6页Journal of Geodesy and Geodynamics

基　　金：中国地震局重大行业专项(201008001);国家自然科学重点基金(40730317);中国地震局地震研究所所长基金(201156085)

摘　　要：运用Parker-Oldenburg迭代反演算法分别在常密度模型和变密度模型下对三峡坝区上、中、下地壳分界面进行了反演,结果表明,变密度模型反演结果更为精细,在变密度和常密度模型下的三峡坝区B1、B2、B3面总体形态特征基本一致,反演结果差异中B2面变化幅度最大,差值最大处达到4 km;三峡大坝处于研究区中地壳最薄处(9 km)。The Parker-Oldenburg iterative inversion method with constant density and variable density model was applied to the Three Gorges dam region.Comparing and analyzing the reversed results with the two models,we can obtain of the accurance undulation the upper,middle and lower crust interfaces（B3,B2,B1）.The results indicated that the variable density model＇s reverse results is more reliable,the general morphological characteristics of two reverse results are consistent.Between the differences of the inversion results,change of B2 is the most,the maximum difference reaches 4 km;the thickness of the middle crust in the Three Gorges dam is about 9 km which is the thinnest area in the Three Gorges region.

关 键 词：反演 重力异常 深部界面 三峡坝区 密度模型 

分 类 号：P315.72[天文地球—地震学]