重力均衡与地形波长——兼论均衡理论不适宜于珠峰重力值的推估
Gravity(Crust) Isostasy and Topographic Wavelength——On Isostatic Isn't Suitable for Gravity Estimation on Qumolangma Peak
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摘要: 150多年来,重力均衡的理论已得到很大的发展,均衡异常与大地水准面差距在地球科学诸多学科中已得到了广泛的应用,各种均衡理论及其相应的重力异常在各种文献中已作了比较和评论;不同波长地形的重力效应,包括短波长的地形不能构成补偿也作了进一步研究。因此,在局部场中不宜用均衡补偿的方法作山区重力点值的推估,而曾经仅用地形(高程)的数据推估珠穆朗玛峰顶上的重力倒是适合的。Abstract: With the great development of gravity isostatic theory relating to recent 150-year period,the isostatic anomalies and geoidal undulation have been widely used in geodesy,geophysics and geodynamics.All kinds of isostatic theories are discussed.In addition,the effect of different wavelength topography on gravity is researched in detail.Results indicate that it is unsuitable to interpolate gravity value concerning local field by isostatic methods in a mountainous area.However,using terrain data to estimate the gravity value on the peak of Everest is reasonable.
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