关于喜马拉雅山重力均衡问题  

The problem on isostasy in Himalaya

作　　者：张赤军[1] 方剑[1] 柳林涛[1] 王新胜[1,2] 叶周润[1,2] 

机构地区：[1]中国科学院测量与地球物理研究所,动力大地测量重点实验室,武汉430077 [2]中国科学院研究生院,北京100049

出　　处：《地球物理学进展》2013年第1期9-16,共8页Progress in Geophysics

基　　金：国家自然科学基金(90814009华北克拉通密度流变结构及均衡调整过程,41021003现代大地测量及其地学应用研究)资助

摘　　要：在19世纪中叶的大地测量学发展中,喜马拉雅是重力(地壳)均衡的策源地,那年代的普拉特(Pratt)和爱黎(Airy)分别提出了各自的均衡模式,而在后期有的文献中却指出:那里并非均衡或不完全均衡,不过,现今仍有人认为:喜马拉雅仍然是重力均衡的地区,尽管上世纪70年代实验均衡理论的出现,也未见到有人对这里均衡程度的问题作些回答.为此,本文从理论和实际上对该问题作了解释和证明,那里的均衡程度尚不到百分之六十,并指出:如按经典均衡理论和方法对该地区(如珠峰)进行重力推估,将会使推估值的失真,并使正高(海拔高)产生较大的影响,可达80cm.Himalaya is the cradle land of isostasy during the development of geodesy in the middle of 19th century, when Pratt and Airy proposed their isostasy models respectively. However, some following papers pointed out that Himalaya is not isostasy or not totally isostasy. But some people still argue that it is isostasy in Himalaya nowadays,although the Experiment isostasy had been presented in 1970 and no one used it to research isostasay question in Himalaya . It is necessary to answer the question whether it is isostasy in Himalaya. This paper concludes that the degree of isostasy is lower than 60%, and points out that it will provide a distorted gravity estimation value in this region, which was estimated according to the theory and method of isostasy, and will make great effect in orthometric height of Qomolangma Peak , maybe 80 centimeters.

关 键 词：均衡 重力 大地测量 喜马拉雅 

分 类 号：P312[天文地球—固体地球物理学]