APPLICATION OF UPWARD CONTINUATION OF GRAVITY AND FREQUENCY SPECTRUM ANALYSIS IN MATLAB
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摘要: 重力场向上延拓是处理重力场数据的一种重要手段。以青藏高原及邻区的布格重力异常数据为研究对象,以重力场等间距近似计算为理论基础,在Matlab编程环境下实现对青藏高原地区的布格重力异常数据的向上延拓处理。得到上延高度1、10、15 km的重力场数据,并将数据生成等值线图,同时运用快速Fourier变换在matlab编程环境下绘出上延不同高度的能谱图。通过对这些图件的分析和比较发现向上延拓之后的重力场能清晰的分离异常局域场与区域场,突出深部地质构造特征,取得了令人满意的效果。Abstract: Upward continuation is an important method in gravity data processing.The gravity data from the Tibetan Plateau and it's adjacent areas were processed using this method.The numerical method of upward continuation in space domain was programmed by the Matlab,a language of technical computer.The Bouguer data was processed with upward continuation at the levels of 1、10 and 15km,and the translated data gained were presented in contours using the Surfer software.Then,write a program to translate the data of different levels into a chart of power spectrum using Matlab.Through comparison of the calculated results with the original gravity field,the regional anomalies could be separated from the locals,and the geological structure in depth become clearer.Upward continuation can be easily and quickly obtained by Matlab.
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Key words:
- gravity anomalies /
- upward continuation /
- frequency spectrum analysis /
- Matlab /
- the Tibetan Plateau
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