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  李琪,杨星,蔡绍平.极化方法应用于地磁台阵的震例分析1[J].震灾防御技术,2015,10(2):412-417, DOI:10.11899/zzfy20150222.

极化方法应用于地磁台阵的震例分析1
摘要:    利用云南地磁台阵5个测点的秒采样观测数据,提取了发生在云南台阵附近宾川MS5.0级地震前的地磁异常信号。通过对地震前后2个月内各个测点极化值SZ/SH时间序列的分析,发现极化值SZ/SH的幅度在震前半个月有明显的增强,而且异常幅度和震中距成反比。同时,通过4个测点极化值SZ/SH时间序列与Dst指数的对比,确定了这种异常幅度的增强并不是由空间电流体系引起的。
作者单位
李琪 中国地震局地球物理研究所北京100081 
杨星 云南省地震局监测中心昆明650224 
蔡绍平 云南省地震局监测中心昆明650224 
关  键  词:极化方法  地磁台阵  震例分析
DOI:10.11899/zzfy20150222
基金项目:中国地震局地球物理研究所中央级公益性科研院所基本科研业务专项项目DQJB12C07和地震行业科研专项项目200708033联合资助。
收稿日期:2014-04-09
作者简介:李琪,女,生于1975年。博士,副研。主要从事震磁关系和空间天气方面的研究工作,并参与中国地震局地磁台网的技术管理。E-mail: darcyli@163.com
通讯作者:
Case Study of Applying Polarization Method to Geomagnetic Array Data
Abstract:      Based on the 1-second sampling data derived from five stations of geomagnetic array in Yunnan Province, the possible seismo-electromagnetic phenomena before the MS5.0 Binchuan earthquake was analyzed. By checking temporal variation of the polarization ratio (as the ratio of vertical magnetic field component to the horizontal one) for each geomagnetic station from 2 months before to 2 months after the MS5.0 Binchuan earthquake, we found that polarization ratio were enhanced just half month before the earthquake, and the peak value of polarization ratio of each station was inversely proportional to the epicentral distance. After comparing the Dst variation with the polarization ratio, we found that the enhanced polarization ratio was not caused by the space current system.
Keywords:  Polarization method  Geomagnetic array  Case study
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