极化方法在分析地磁秒数据异常信息中的应用  

Polarization analysis to extract seismic anomaly from geomagnetic second data

作　　者：刘奕君[1] 张建国 

机构地区：[1]中国地震局地球物理研究所,中国北京100081 [2]邯郸中心地震台,中国河北056000

出　　处：《地震地磁观测与研究》2014年第5期113-119,共7页Seismological and Geomagnetic Observation and Research

基　　金：国家自然科学基金项目(41274079);河北省地震局重点科研基金课题(批准号:冀震发[2010]20号)联合资助

摘　　要：采用极化分析方法处理地磁秒数据。对不同台站地磁秒数据进行分析发现,极化值在地震发生前约2个月内有明显异常,且在傅里叶频谱上表现不太明显。另外,不同地磁分量的极化值映震效果不同,大部分震例极化值升高、振幅增大,小部分震例极化值低值、平稳。研究认为,该方法可以用于地磁秒数据震磁异常信息提取。Polarization analysis on geomagnetic second data is used in this paper. After analyzing dif- ferent seismic data from different stations, changes are evident in polarization value about two months before the earthquake which are not in the Fourier spectrum. In addition, the abilities in reflecting earthquake of different ratios are varied. Most cases have a distinctive rise both in polarization value and the amplitude, some others show a decrease in polarization value and smooth in the fluctuation. This study suggests that the method can be used to ex- tract anomalies from geomagnetic second data.

关 键 词：地磁秒数据 极化分析 异常提取 地震预测 

分 类 号：P315.721[天文地球—地震学]