| 离散小波变换与重力异常多重分解 |
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| 引用本文： | 杨文采,施志群,侯遵泽,程振炎.离散小波变换与重力异常多重分解[J].地球物理学报,2001,44(4):534-541. |
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| 作者姓名： | 杨文采 施志群 侯遵泽 程振炎 |
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| 作者单位： | 1. 地质科学院地质研究所,北京100037;
2. 利亚Encom高科技公司,悉尼NSW2061;
3. 人民武装警察部队学院,廊坊065000 |
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| 基金项目： | 国土资源部大陆科学深钻工程先行研究项目 |
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| 摘 要： | 小波变换多尺度分析是位场分解的有益工具.离散二维小波变换产生的低阶小波细节具有尺度不变的特征,它们不随小波变换的总阶数改变,而总阶数的增加仅增加高阶小波细节的个数和改变最后的高阶逼近.因此,用小波变换分解重力异常时,可根据地质目的来组合小波细节,从而实现有地质意义的异常分解.实验表明,用小波变换分解的重力异常小波细节,同样起到功率谱分解的作用,用分解之后的小波细节功率谱可以精确确定场源的埋深.中国大陆科学钻探场地的重力异常分解给出局部异常分解的典型例子.
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| 关 键 词： | 离散小波变换 多尺度分析 重力异常多重分解 尺度不变原则 小波功率谱分析 中国大陆科学钻探 |
| 文章编号： | 0001-5733(2001)04-0534-08 |
| 收稿时间： | 2000-09-11 |
DISCRETE WAVELET TRANSFORM FOR MULTIPLE DECOMPOSITION OF GRAVITY ANOMALIES |
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| YANG WEN CAI,SHI ZHI QUN,HOU ZUN ZE,CHENG ZHEN YAN.DISCRETE WAVELET TRANSFORM FOR MULTIPLE DECOMPOSITION OF GRAVITY ANOMALIES[J].Chinese Journal of Geophysics,2001,44(4):534-541. |
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| Authors: | YANG WEN CAI SHI ZHI QUN HOU ZUN ZE CHENG ZHEN YAN |
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| Institution: | 1. Institute of Geology, CAGS,Beijing,100037,China;
2. Encom Tec. Pty Ltd,Milsons Point,NSW 2061,Australia;
3. Chinese People′s Armed Police Academy,Langfang, Hebei, 065000, China |
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| Abstract: | Wavelet and multiscale analysis can be a powerful tool for multiple decomposition of potential fields data. Discrete wavelet transform generates low order wavelet details that keep invariant with the total order number;while changing the total order number can only increase wavelet details of the highest orders and degree of smoothness of the final approximation. Thus,one can combine wavelet details based on regional geology to decompose gravity anomalies,producing anomalies correlated to certain geological sources. Applying the traditional spectrum analysis techniques,one can estimate the everage depth of sources for every wavelet detail,correlated statistically the decomposed wavelet detail with meaning of the source depth. Typical examples for triple decomposition of local anomalies are given by using gravity data obtained from Chinese continental scientific drilling site. |
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| Keywords: | Discrete wavelet transform Multiscale analysis Multiple decomposition of gravity fields Invariant scale criteria Wavelet spectral analysis Chinese continental scientific drilling site |
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