中国中西部重力场谱分析

SPECTRAL ANALYSIS OF THE GRAVITY FIELD IN THE WEST CENTRAL AREA OF CHINA

本文对中国中西部地区的12°×12°局部重力场进行了全面细致的谱分析.内容包括功率谱和协方差分析、阶方差模型拟合及累积阶方差根谱参数分析,其中累积阶方差根谱参数是本文首次建立的一项新的分析内容.经过谱分析,了解到许多关于中西部重力场的性质,例如该区域重力场的协方差、总能量、能量在各个频段的分布以及非各向同性情况等.

In this paper, the spectral properties of th local gravity field in the west central area of China are studied in some detail, where the data used to cover 12°×12°area (28°≤φ≤40°, 96°≤λ≤108°). The contents of spectral analysis include the analysis of power spectrums and covariances, the model fits of degree variances and the analysis of the spectral parameter RADV (root of accumulative degree variance). RADV is first used in the paper as a new kind of the analysis of the earth gravity field. Through the spectral analysis, many properties about the gravity field in the west central area of China are discovered; for example, the covariances, total energy, energy distributions in the several frequence sections, and anisotropy of the area. The analysis involves two steps; the first step, the spectral analysis of the whole area, and the second, it is applied to each of the sixteen 3°×3° blocks into which the area is divided.