| 磁总场异常垂直梯度三维相关成像 |
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| 引用本文： | 石磊,郭良辉,孟小红.磁总场异常垂直梯度三维相关成像[J].地球物理学进展,2012,27(4):1609-1614. |
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| 作者姓名： | 石磊 郭良辉 孟小红 |
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| 作者单位： | 1. 中国地震局地球物理研究所,北京,100081
2. 中国地质大学(北京)地球物理与信息技术学院,北京100083;地下信息探测技术与仪器教育部重点实验室(中国地质大学,北京),北京100083 |
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| 基金项目： | 国家自然科学基金青年科学基金项目(40904033);中央高校基本科研业务费专项资金资助(2010ZY26,2011PY0184);SinoProbe专项课题(201011039)联合资助 |
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| 摘 要： | 本文提出了磁总场异常垂直梯度三维相关成像方法,用于成像地下等效磁源分布.它首先将地下待成像空间划分为三维规则网格,然后直接计算每个网格节点磁偶板子在观测面理论磁总场异常垂直梯度与实测磁总场异常垂直梯度的互相关,其相关系数值表征等效磁偶极子分布(即磁偶极子发生的概率).理论长方体组合模型数据和实际某矿区磁测资料试验结果表明本文方法计算得到的相关系数值能基本反映地下的磁源分布,且分辨率明显高于磁总场异常三维相关成像的分辨率,也高于基于熵滤波分离异常的磁总场异常三维相关成像的分辨率.
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| 关 键 词： | 磁总场异常 垂直梯度 相关系数 磁偶极 |
3D correlation imaging of the vertical gradient of magnetic total field anomaly |
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| SHI Lei
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GUO Liang-hui
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MENG Xiao-hong.3D correlation imaging of the vertical gradient of magnetic total field anomaly[J].Progress in Geophysics,2012,27(4):1609-1614. |
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| Authors: | SHI Lei GUO Liang-hui MENG Xiao-hong |
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| Institution: | 2,3(1.Institute of Geophysics,China Earthquake Administration,Beijing 100081,China; 2.School of Geophysics and Information Technology,China University of Geosciences,Beijing 100083,China; 3.Key Laboratory of Geo-detection(China University of Geosciences,Beijing),Ministry of Education,Beijing 100083,China) |
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| Abstract: | We present a new correlation imaging approach for the vertical gradient of magnetic total field anomaly for deriving an equivalent magnetic sources distribution of the subsurface.In this approach,we divide the subsurface space into a 3D regular grid,and then at each grid node calculate cross correlation between the vertical gradient of observed magnetic total field anomaly and the vertical gradient of theoretical magnetic total field anomaly due to a magnetic dipole source.The resultant correlation coefficients are used to describe equivalent magnetic dipole distribution in a probability sense.The tests on the synthetic data and the real data show that the equivalent magnetic dipoles distribution derived by the approach basically reflects the causative sources of the subsurface,and also illustrate that its resolution is higher than both that from 3D correlation imaging for magnetic total field anomaly and from 3D correlation imaging based on entropy filter for magnetic total field anomaly. |
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| Keywords: | Magnetic total field anomaly vertical gradient correlation coefficient magnetic dipole |
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