2007年5月-2013年12月成都、西昌和重庆台地磁转换函数的时间变化  

Time changes in the geomagnetic transfer functions at Chengdu,Xichang and Chongqing stations from May 2007 to December 2013

作　　者：龚绍京[1] 刘双庆[1] 张明东[1] 

机构地区：[1]天津市地震局,中国天津300201

出　　处：《地震学报》2015年第1期144-159,205,共16页Acta Seismologica Sinica

基　　金：天津市地震局局长科研基金资助

摘　　要：本文较详细地讨论了地磁转换函数的计算方法,介绍了复转换函数实部和虚部的误差公式.利用成都、西昌和重庆3个地磁台2007年5月-2013年12月的地磁数字化资料,计算出转换函数A,B及帕金森矢量.结果表明,在2008年汶川Ms8.0地震前后成都台存在可察觉的小鼓包,而西昌、重庆两台则没有可察觉的异常.另外与20世纪80年代的结果比较,汶川地震前后成都台的6值和帕金森矢量的长度及方向都有明显的长期变化.This paper discusses the method for computing geomagnetic transfer functions in detail and introduces the error formulae of the real and imaginary parts of complex transfer functions. And then the transfer functions A and B as well as Parkinson vectors are calculated by using the digital geomagnetic data recorded at the stations Chengdu, Xichang and Chongqing from May 2007 to December 2013. The results show that there are perceptible small bulges at Chengdu station before and after the 2008 Wenchuan MsS. 0 earthquake, but the other two stations do not exhibit perceptible anomalies. Comparison with the results in the 1980s indicates that obvious long-term variations of the b value as well as the length and direction of Parkinson vectors are observed at the station Chengdu.

关 键 词：地磁转换函数 复数最小二乘法 多元回归分析 稳健估计 帕金森矢量 地震异常 

分 类 号：P315.721[天文地球—地震学]