四川盆地及其西部边缘震区视磁化强度分布与孕震环境的研究  

RELATION OF APPARENT MAGNETIZATION INTENSITY DISTRIBUTION IN SIHUAN BASIN AND THE EARTHQUAKE REGION ON ITS WESTERN MARGIN TO SEISMOGENIC ENVIRONMENT

作　　者：张先[1] 虎喜凤[1] 沈京秀 赵丽[1] 刘敏[1] 

机构地区：[1]国家地震局地球物理勘探大队

出　　处：《华北地震科学》1995年第1期17-22,共6页North China Earthquake Sciences

基　　金：国家地震局地震联合基金

摘　　要：在对四川盆地及其西部边缘震区航磁资料进行分析研究的基础上，依据频率域磁化强度反演方法和程序对航磁异常进行了数据处理，求取了研究区内视磁化强度的水平分布。反演结果反映出盆地西部边缘震区视磁化强度与川中地区有明显的差异。通过分析认为造成震区岩石视磁化强度偏低，主要是由于岩性、构造应力、温度诸方面的因素造成的。本文就视磁化强度分布结合深部构造特征，对盆地西部边缘震区地壳的弱磁性成因及地震的孕育环境进行了讨论。On the basis of aeromagnetic data analysis of Sichuan Basin and the earthquake region on its western margin,the data processing was conducted with inverse method and program of magnetic intensity in the frequency domain,and the horizontal distribution of apparent magnetic intensity in the investigated area is obtained. The inversion result reflects obvious difference between apparent magnetic intensity of the earthquake region on the western margin of the Basin and that of central Sichuan. Analyses show that low apparent rock intensity of magnetization is due to factors such as lithologic characteristics,tetonic stress and temperature.This paper discusses the cause of weak magnetism in the earthquake region on the western margin of the Basin and the seismogenic environment in the light of magnetic intensity distribution and deep tectonic feature.

关 键 词：磁化强度 四川 航空磁测 地震 孕震环境 

分 类 号：P315.63[天文地球—地震学]