垂直电场观测试验及数据初步分析

英文篇名：Experimental observation and preliminary data analysis of vertical geo-electric field
中文刊名：地震学报
英文刊名：Acta Seismologica Sinica
作者：王兰炜 ; 张世中 ; 康云生 ; 安海静
英文作者：Wang Lanwei1) Zhang Shizhong1) Kang Yunsheng2) An Haijing2)1) Institute of Crustal Dynamics ; China Earthquake Administration ; Beijing 100085 ; China2) Earthquake Administration of Gansu Province ; Lanzhou 730000 ; China
中文关键词：垂直地电场 ; 水平地电场 ; 电极 ; 周期 ; 日变化
英文关键词：vertical geo-electric field ; horizontal geo-electric field ; electrode ; period ; diurnal variation
出版日期：2011-07-15
机构：中国地震局地壳应力研究所;甘肃省地震局;
年：2011
期：04
出版单位：地震学报

摘要

地震发生前的电磁异常现象已被地面、卫星等多种观测手段观测到.目前,我国已经建成了100多个水平地电场观测台站,然而对于垂直电场的观测仍是一个空白.自2009年4月开始,在甘肃天祝地震前兆科学台阵的红沙湾、黄羊川、松山建立了3个垂直电场观测试验站,进行垂直地电场的试验观测,在我国专门的垂直地电场观测试验研究尚属首次.通过近1年的观测试验,取得了有价值的观测资料.从数据的初步结果来看,垂直电场的日变化形态清晰,黄羊川和松山观测数据的日变幅度在16 mV/km左右,红沙湾观测数据的日变幅度在8 mV/km左右;垂直电场日变化周期的主要成分是24小时的全日波,其次是12小时周期的半日波.
Electromagnetic anomalies before earthquakes have been observed many times on ground and by satellite.At present,there are more than one hundred stations for horizontal geo-electric field observation in China.However,there had been none for vertical geo-electric observation before this study.Since April 2009 we have set up three vertical geo-electric field observation sites at Songshan,Huangyangchuan and Hongshawan in Tianzhu region,Gansu province.It is the first time to do this kind of study in China.For one year's measurement the vertical geo-electric data display a long-term fluctuation and a strong diurnal variation.The diurnal variation amplitude is about 16 mV/km in Songshan and Huangyangchuan,and 8 mV/km in Hongshawan.By spectrum analysis we found that the amplitude of the 24 h period component is the largest and the 12 h period ones is secondary in vertical geo-electric diurnal variation.

引文

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