川滇地区岩石圈磁场的小波多尺度分析
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摘要
岩石圈磁场是从浅部至深部不同异常源引起磁异常的叠加,包含了从浅部到深部的丰富信息。本文对川滇地区岩石圈磁场的X、Y、Z三分量作一至五阶尺度分解后,得到不同深度处异常源磁异常的分布特性,并结合其他相关地球物理因素,研究它们之间是否存在着相关性。结果表明,川滇地区地壳磁性体存在明显的横向不均匀性,区内磁异常条带和复杂的断层构造与地震带分布具有一定的相关性,在应用过程中小波多尺度进行分析的过程中表现出了较强的层次感,特别是细节异常对分析局部断裂的空间分布更直观、便利,在总体上优于传统分解方法。
Lithospheric magnetic field is the accumulation of different anomalies in the shallow and deep parts,including a lot of information.This paper analyzes the lithospheric magnetic field X,Y,Z three-component order from one to five scale decomposition,finds out distribution characteristics of magnetic anomaly sources in different depths,and with the help of other geophysical factors,tries to discuss the correlation of the factors.The results show some relevance between the magnetic anomalies in the study area and the distribution of fault structure and earthquake belt,strong levels in the wavelet scale analysis;a detailed anomaly is more obvious and convenient in the spatial distribution analysis than the traditional decomposition method.
Lithospheric magnetic field is the accumulation of different anomalies in the shallow and deep parts,including a lot of information.This paper analyzes the lithospheric magnetic field X,Y,Z three-component order from one to five scale decomposition,finds out distribution characteristics of magnetic anomaly sources in different depths,and with the help of other geophysical factors,tries to discuss the correlation of the factors.The results show some relevance between the magnetic anomalies in the study area and the distribution of fault structure and earthquake belt,strong levels in the wavelet scale analysis;a detailed anomaly is more obvious and convenient in the spatial distribution analysis than the traditional decomposition method.
引文
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[6]刘大为,刘天佑,董建华.小波多尺度分析在煤田火烧区磁法探测中的应用[J].煤田地质与勘探,2005,6:61-63.
[7]刁博,王家林,程顺有.重力异常小波多分辨分析分解阶次的确定[J].中国地质大学学报,2007,4:564-568.
[8]王明,孟小红,郭良辉,等.多尺度分析法在南海磁异常分离中的应用[C].中国地球物理学会第二十四届年会论文集,2008.
[2]钟锴,徐鸣洁,王良书,等.川滇地区重力场特征与地壳变形研究[J].高校地质学报,2005,11(1):111-117.
[3]徐文耀.地球电磁现象物理学[M].合肥:中国科学技术大学出版社,2009.
[4]万永革.中国大陆及华北地区地震资料的小波分析[J].大地测量与地球动力学,2003,23(4):28-33.
[5]Fairhead M S,Hemant D,Ravat K,et al.A near2-surface geomagnetic field model to spherical harmonicdegree 720[J].Eos Trans AGU,2006,87(52):FallMeet Suppl,Abst ract GP42A202.
[6]刘大为,刘天佑,董建华.小波多尺度分析在煤田火烧区磁法探测中的应用[J].煤田地质与勘探,2005,6:61-63.
[7]刁博,王家林,程顺有.重力异常小波多分辨分析分解阶次的确定[J].中国地质大学学报,2007,4:564-568.
[8]王明,孟小红,郭良辉,等.多尺度分析法在南海磁异常分离中的应用[C].中国地球物理学会第二十四届年会论文集,2008.
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