摘要
地磁预报地震的方法有加卸载响应比、逐日比、谐波振幅比、低点位移、极化法等多种方法。结合加卸载响应比和双低点两种方法分析河津4.8级地震,可大大提高预测地震的可信度。在地震孕育的过程中,随着孕震区应力,介质电导率等电磁性质的改变,区域地磁场垂直分量日变曲线会出现相位和幅度变化,结果表明,地震前8天,山西、陕西、河南、湖北等大部分地区出现了"双低点"异常,加卸载响应比在地震前75天也出现了高值的异常,震中位于低点异常分界线附近,地磁低点位移的出现与地震的孕育和发生相关。
The geomagnetic methods for earthquake prediction include the response ratio of loading and unloading,day to day ratio,harmonic amplitude ratio,low-point-displacement,polarization method and so on.This paper combines the response ratio of loading and unloading with the method of＂double lows＂to analyze the 4.8 magnitude earthquake in Hejin,which can greatly improve the reliability of earthquake prediction.In the process of earthquake inoculation,with the change of electromagnetic properties in the seismogenic zone stress and conductivity,the diurnal variation curve in regional vertical magnetic field will show the changes of phase and amplitude.The results show that most parts of Shanxi,Shaanxi,Henan,Hubei appear the anomaly of＂double low＂in the 8 days before the earthquake;the response ratio of loading and unloading also appears high value anomaly in the75 days before the earthquake;the epicenter is located near the low anomaly boundary,and the low geomagnetic shift is related to the earthquake inoculation and occurrence.
出处
《工程地球物理学报》
2018年第1期44-49,共6页
Chinese Journal of Engineering Geophysics
关键词
谐波振幅比
地磁Z分量
低点位移
地磁日变
预报地震
河津地区
harmonic amplitude ratio
geomagnetic Z component
low point displacement
geomagnetic diurnal variation
predicting earthquakes
Hejin region
