宁夏地区地磁转换函数变化及其与近震的关系
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摘要
计算分析了银川台1983年1月~1996年10月的地磁周期T=9~200min的复转换函数A的模|A|、总误差σz和帕金森矢量或韦氏矢量,并将其在银川台400km范围内8次中强地震发生时的变化进行了研究。结果表明:周期为12、20、26、35、45、60、75、90min的|A|、σz磁方位角αp及其方差Δαp在震前有明显的异常变化,帕金森矢量或韦氏矢量在震前指向震中。
The modules |A| of complex transfer functions for the geomagnetic field with the periods of T=9~200 minutes from January 1983 to October 1996 at Yingchuan seismic station are calculated and analyzed as well as the overall error σz and Parkinson or Wiess vector.The variation of those for 8 moderate and strong earthquakes 400 km far from Yingchuan station are studied.The study showed that the |A|,σz,magnetic azimuth αp and difference Δαp varied abnormously at the periods 12,20,26,35,45,60,75 and 90 minutes and the Parkinson or Weiss vector pointed toward the epicenters before the earthquakes.
引文
曾小苹,林云芳.1995.地磁短周期变化异常对中国中强地震的响应.地震,1,29~36国家地震局科技监测司编.地震预报方法实用化研究文集——地磁地电专辑.1990.北京:学术书刊出版社祁贵仲,詹志佳,侯作中等.1981.渤海地区地磁短周期变化异常,上地幔高导层分布及其与唐山地震的关系.中国地震,7,869~879《国外地震科技情报》编辑部编.地磁短周期变化译文集.1987年增刊

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