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《Chinese Journal of Geophysics》 2016-01
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Aeromagnetic field characteristics and the Wenchuan earthquakes in the Longmenshan mountains and adjacent areas

YAN Ya-Fen;TENG Ji-Wen;RUAN Xiao-Min;HU Guo-Ze;Institute of Geology and Geophysics,The Chinese Academy of Sciences;Schlumberger Geosolutions;Northeastern University at Qinhuangdao;  
In this paper,we analyzed the aeromagnetic anomaly data in the Longmenshan mountains and adjacent areas by different methods,such as vertical magnetization,horizontal and vertical derivation,upward continuation,frequency and wavelet transform.The results show that the characteristics of magnetic anomalies suggest this area could be divided into three magnetic anomaly blocks which have different medium properties in crust.They are the SongpanGarzêmagnetic anomaly area,the Longmenshan negative area,and the magnetic anomaly area in the Sichuan basin. The analysis of aeromagnetic anomaly characteristics reveals spatial distribution of the tectonic units and major faults in the Longmenshan mountains,Sichuan basin and the plateau in western Sichuan.There is a correlation between the aeromagnetic anomalies,top and bottom depths of the magnetic bodies and the 2008 Wenchuan MS8.0earthquake.
【Fund】: 国家科技支撑计划“汶川地震断裂带科学钻探”(13);; 973项目“汶川地震发生机理及其大区动力环境研究(1-3)”(2008CB425701)联合资助
【CateGory Index】: P315
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