摘要
根据有限的重力资料，首先对珠穆朗玛峰附近的重力场特征作了分析，结果表明，空间异常（Δｇｆ）均为正值且变化剧烈，它主要受地形起伏制约；布格异常（Δｇｂ）均为负值，但比其北侧高原大，说明喜马拉雅山虽然最高，但“山根”并非最深；均衡异常（Δｇｉ）均为正值，且比南北两侧为大，揭示了喜马拉雅山脊的下方可能存在密度较大的物质。其次，根据Δｇｆ与高程相关性极强（关联度达０．９６～０．９７）的特点与４种有关的公式，有效地推估了珠峰顶上的重力值，该值为９７６９８０×１０－５ｍ·ｓ－２，其平均误差为±６×１０－５ｍ·ｓ－２。这一结果可为精确确定珠峰的大地水准面和正高提供必要的数据。
Based on the limited gravity observations, the gravity features in Zhumulangma peak and its vicinity are analyzed. The result shows that the space anomalies which are controlled by topography are positive and changeable intensively over the Zhumulangma. The Bouguer gravity anomalies, however, are negative and greater than that of the northern plateau in Zhumulangma, which indicate the mountain root under the Himalayan is not the deepest, though the Himalayan is the highest peak in the world. The isostatic gravity anomalies in Zhumulangma are positive and greater than that in the northern and southern side, which explore that there could be the high density materials beneath the Himalayan ridge. In addition, according to the intense correlation of the Bouguer with height and four kinds of formulas, the gravity value at the top of Zhumulangma peak is estimated to be 976980×10 -5 m·s 2 with mean error 6.5×10 5 m·s 2 . The result can provide the necessary data for determining precisely the geoid and orthometric height of Zhumlangma peak.
出处
《地壳形变与地震》
CSCD
1999年第1期20-25,共6页
Crustal Deformation and Earthquake
基金
国家自然科学基金
中科院测地所动力大地测量学开放实验室资助
关键词
重力场
重力值推估
珠穆朗玛峰
回归分析
gravity field, estimation of gravity value, Zhumalangma peak.
