地震学报Issue(5)：930-943,14.DOI:10.3969/j.issn.0253-3782.2014.05.016
基于Copula理论挖掘地磁Z分量震磁信息
Mining for seismomagnetic information of geomagnetic Z component based on Copula theory
摘要
Abstract
In this paper,we selected geomagnetic data of five seismographic sta-tions in Tianjin,analyzed and calculated geomagnetic Z component data from 1986 to 2013 based on Copula theory. After comparison of Kendall and Spearman coefficients in a variety of models,the optimal model was got,and then Kendall coefficient timing curves were analyzed in different cycles.The calculated results show that Kendall coefficient timing curve is in the disordered phase before the MS≥5 .0 earthquake,and its consistency turns better rapidly after the earthquake.That is because the accumulated seismic stress causes the underground electrical structure to change,and the stress is released after the earthquake,magnetic field data returns to normal.It is more predominant that Kendall coefficient of the Qingguang seismographic station (it has the smallest distance from the epicenter)dropped sharply before the Wen’an MS5.1 earth-quake in 2006 ,which is different from that of other stations;while Kendall co-efficient of the Ninghe seismographic station (it has the smallest distance from the epicenter)rose marginally before the Tangshan MS4.8 earthquake in 2012.关键词
Copula函数/Kendall系数/Spearman系数/模型检验/地下电性结构Key words
Copula function/Kendall coefficient/Spearman coefficient/model test/underground electrical structure分类
天文与地球科学引用本文复制引用
张明东,张文蕾,曹井泉,王建国,谭青,张玮..基于Copula理论挖掘地磁Z分量震磁信息[J].地震学报,2014,(5):930-943,14.基金项目
天津市地震局中青年基金、华北首都圈流体学科异常跟踪项目（143004）和首都圈地震电离层监测项目联合资助． （）
