新丰江中心地震台地电均方差异常探讨

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英文篇名：A Preliminary Discussion of the Earth Current Mean-Square Deviation at Heyuan Geoelectrical Station 中文刊名：防灾科技学院学报 英文刊名：Journal of Institute of Disaster-Prevention Science and Technology 作者：伍春相 英文作者：Wu Chunxiang(Xinfengjiang Seismic Central Station ; Seismological Bureau of Guangdong Province ; Heyuan city 517021) 中文关键词：地电阻率 ; 自然电位 ; 均方差 ; 异常 英文关键词：earth resistivity ; natural electric potential ; the mean-square deviation ; anomaly 出版日期：2006-09-30 机构：广东省地震局新丰江中心地震台 广东河源市517021 年：2006 期：03 出版单位：防灾科技学院学报

摘要

河源地电台在地电资料观测过程中发现:从1997年1月下旬至1997年12月上旬,第3道(N80°W)观测到了五次长时间、连续、大幅度的均方差异常现象(图1),在每次异常结束附近或较显著转折处均有3.0级以上本区地震发生,这种现象在目前国内外地电的相关报道中尚属少见[1],由图1也可以看出,在每次均方差异常期间相应的自然电位及地电阻率呈锯齿状变化;震级的大小与均方差异常的幅度及延续时间有一定的关系。本文试图对这一现象作一些分析探讨,并从实地调查的结果进一步说明了其发生的可能机理,对相关现象提出了一些讨论。
Heyuan geoelectrical station finds in the course of observing the earth current materials that the third route(N80°W)observes five times of long-term,successive large-scale mean-square deviation(picture 1) from the last ten days of January,1997 to the first ten days of December 1997,and at the obvious turning points and the places around which the anomaly ends,earthquakes of over 3.0 magnitude happen.Such a phenomenon is rarely seen in the earth current related reports of home and abroad.Fig.1 shows that each time the mean-square deviation appears,the corresponding natural electric potential and the earth resistivity display zigzag changes.There are certain relations between magnitude size and the range of the mean-square deviation and the perdurability.This article attempts to analyze and discuss about this phenomenon and further proves its possible mechanism through the result of the field investigation,and then proposes some discussions on relevant phenomena.

引文

[1]石特临.地震地电学发展与展望文集[C].兰州:兰州大学出版社,1998.
    [2]国家地震局科技司.地震电磁观测技术[M].北京:地震出版社,1995.