【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。更多还原

【Abstract】 Polarization analysis on geomagnetic second data is used in this paper.After analyzing different 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 extract anomalies from geomagnetic second data.更多还原