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  张彩艳,李飞,苏宏伟.甘肃大地电场的变化特征分析[J].震灾防御技术,2015,10(2):435-446, DOI:10.11899/zzfy20150225.

甘肃大地电场的变化特征分析
摘要:    对甘肃省平凉、松山、古丰、山丹、高台、嘉峪关、瓜州7个台站的地电场分钟值、小时值的日变特征进行了对比,对2012年3月地电场小时值进行了频谱分析,同时结合地磁场H分量、分量应变(固体潮)进行了对比分析。结果表明:①地电场静日的日变化都很明显,呈明显“双峰”和“单谷”形态,并且NS向与EW向变化形态基本相同;各台站同测向及相互之间的自相关系数基本在0.85;不同台站之间同测向的相关系数多数在0.75以上;这是地磁场H分量与固体潮共同影响的结果。②通过频谱分析各台站的优势周期主要以12h和8h为主,但存在差异性,谱值最大相差20倍。③各台站的日变幅也不尽相同,其中,差异性主要表现为与地磁场和固体潮影响量的差异性,并与台站的位置、地质构造、电性结构、浅层电阻率等有很大关系。
作者单位
张彩艳 甘肃省地震局嘉峪关地震台嘉峪关 735100 
李飞 江苏新沂地震台新沂 221400 
苏宏伟 甘肃省地震局嘉峪关地震台嘉峪关 735100 
关  键  词:地电场  日变化  周期  FFT  变化特征
DOI:10.11899/zzfy20150225
基金项目:国家自然科学基金(41374080)资助
收稿日期:2015-04-09
作者简介:张彩艳,女,生于1969年。工程师。主要从事地震监测预报工作。E-mail: 45077492@qq.com
通讯作者:
Characteristics and Variation Analysis of Observation Data from Geoelectric Monitoring Network of Gansu Province
Abstract:      Through comparing variation of daily value of geoelectric field data in Pingliang, Songshan, Gufeng, Shandan, Gaotai, Jiayuguan and Guazhou based on its minute value and hour value, we analyze frenquency-spectrum of its hour value in March 2012, combined with component of H of geomagnetic field and component strain (earth tides), and then extracted change characteristics and difference of geoelectric field. The results show that: (1) Daily changes of geoelectric field in quiet day are significant, which is shaped by double peak and one valley, and the changes are almost the same in NS and EW direction. Auto-correlation in each observation direction and the same observation directions of each station remain a high value at 0.85. Correlation coefficients of the same observation direction mainly exceed 0.75. The result is controlled by both H component of geomagnetic field and earth tides. (2) Frequency-spectrum analysis suggest that the dominant cycle of each station is mainly 12 hours or 8 hours, but the spectrum value shows significant variation, even reaching as high as 20 times. (3) Amplitudes of daily change in each station not only show similarities, but also present remarkble difference. (4) These differences are very likely caused by the difference of geomagnetic field and earth tides, station location, geological structure, electrical structure and shallow resistivity.
Keywords:  Geoelectric field  Diuenal varition  Period  FFT  Changing characteristics
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