龙门山及其邻区航磁与卫星磁测资料处理解释
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摘要
利用小波分析方法处理解释龙门山及其邻区(102°E～107°E,29.8°N～33°N)1:20万航磁资料,得出川西坳陷高值异常区、龙门山磁异常陡变带与红原——黑水低缓负异常区3个不同地质构造单元,以及龙门山超壳断裂带的构造特征。龙门山断裂由天全向北东经都江堰、汶川,在平武-青川分为两支,一支往北,一支往北东的宁强。龙门山断裂与地震震源在空间上并没有明显的对应关系。利用增强型NGDC-720岩石圈磁场模型反演龙门山地区居里等温面,发现地震震源基本上围绕着居里等温面隆起分布,呈北北东走向。这些处理解释结果对于探讨龙门山及其邻区深部与区域构造及与汶川地震的关系有参考意义。
According to the data of aeromagnetic and CHAMP magnetic anomalies in the Longmen Mountain and its adjacent region(102°E~107°E,29.8°N~33.8°N),based on analyzing the characteristics of the anomalies,the paper analyzes the characteristics of the fault system by using the technology of wavelet multi-scale analysis,and gives curie isothermal surface inversion and interpretation.Finally,we discuss the relationship between the magnetic anomalies and earthquake.
According to the data of aeromagnetic and CHAMP magnetic anomalies in the Longmen Mountain and its adjacent region(102°E~107°E,29.8°N~33.8°N),based on analyzing the characteristics of the anomalies,the paper analyzes the characteristics of the fault system by using the technology of wavelet multi-scale analysis,and gives curie isothermal surface inversion and interpretation.Finally,we discuss the relationship between the magnetic anomalies and earthquake.
引文
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[2]李勇,周荣军,DensmoreA.L.,等.青藏高原东缘大陆动力学过程与地质响应[M].北京:地质出版社,2006.
[3]罗志立.四川盆地基底结构的认识[J].成都理工大学学报,1998,25(2):191～200.
[4]钟锴,徐鸣洁,王良书,等.川西两期前陆盆地南北两段构造演化的地球物理特征[J].石油学报,2004,25(6):29～32.
[5]宋洪彪,刘树根.龙门山中北段重磁场特征与深部构造的关系[J],成都地质学院报,1991,18(1):74～82.
[6]Ucan ON,Seker AM,Albora.Separation of magneticfields in geophysical studies using a 2-D multi-res-olution Wavelet analysis approach[J].Journal of TheBalkan Geophysical Society,2000,3(3):53～58.
[7]Ridsdill-Smith T A.Separation aeromagnetic anom-alies using wavelet matched filters[A].in 68th AnnualInternational Meeting.SEG,Expanded Abstracts[C].1998,500～553.
[8]Mallat S,Hwang,Singularity W L.Singularity Detec-tion and Processing with Wavelets[J].IEEE,1992,38(2):617～643.
[9]梁锦文.位场小波分析的物理解释[J].地球物理学报,2001,44(6):865～870.
[10]刘天佑.位场勘探数据处理新方法[M].北京:科学出版社,2007.
[11]朱介寿.汶川地震的岩石圈深部结构与动力学背景[J].成都理工大学学报(自然科学版),2008,35(4):348～356.
[12]NOAA/NGDC Satellite and infomation Service[EB/0L].http://www.ngdc.noaa.gov/geomag/geomagIletic field model at NGDC,2007.
[13]M.A.Mayhew.Curie isotherm surfaces inferredfrom high-altitude magnetic anomaly date[J].Journal of Geophysical Research,1985,90(B3):2647～2654.
[14]M.A.Mayhew.An equivalent source model of thesatellite-altitude magnetic anomaly field overAustralia[J].Earth planet.Sci.Lett.,1988,51(1):189～198.
[15]刘天佑,朱文孝,方晓梅.一种连续模型的居里面反演方法[J].地球科学-中国地质大学学报,1987.12(6):647～656
[16]陈学波,吴跃强,杜平山,等.龙门山构造带两侧地壳速度结构特征[A].见:国家地震局科技监测司编.中国大陆深部构造的研究与进展[C].北京:地震出版社,1998:97～113.
[17]韩宗珊.川西和云南地区地热资源分布规律及其与地质构造的关系[A].见:中国科学院地质力学研究所编.地热专辑[C].北京:地质出版社,1989.103～109.
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