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
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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.
引文
1管志宁,等.视磁化强度填图方法及应用.物探与化探,1990,14(3):173—1812管志宁,等.区域磁异常定量解释.北京:地质出版社,1991,200—2183韩渭宾,等.松潘、平武地震和川青块体的运动.地震科学研究,1980,(1).4程式,等.1973年8月11日四川省松潘(黄龙)6。5级地震.中国震例,北京:地震出版社,1988,117-1285管志宁,等.磁法勘探重要问题理论分析与应用.北京:地质出版社,1993,23—296王钧,等.中国地温分布的基本特征.北京:地震出版社,1990,130—139

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