|本期目录/Table of Contents|

[1]倪晓寅,陈 莹.强震前短周期地磁谐波振幅比变化特征*[J].地震研究,2017,40(03):431-436.
　NI Xiaoyin,CHEN Ying.The Variation Characteristics of Short-Period Geomagnetic Harmonic Wave Amplitude Ratio before Strong Earthquakes[J].Journal of Seismological Research,2017,40(03):431-436.
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强震前短周期地磁谐波振幅比变化特征*(PDF/HTML)

《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:
40
期数:
2017年03期
页码:
431-436
栏目:
流动地磁专栏
出版日期:
2017-07-20

文章信息/Info

Title:
The Variation Characteristics of Short-Period Geomagnetic Harmonic Wave Amplitude Ratio before Strong Earthquakes
作者:
倪晓寅; 陈 莹
(福建省地震局,福建 福州 350003)
Author(s):
NI Xiaoyin; CHEN Ying
(Fujian Earthquake Agency,Fuzhou 350003,Fujian,China)
关键词:
地磁场;  谐波振幅比;  岷县—漳县6.6级;  芦山7.0级地震
Keywords:
geomagnetic field;  harmonic wave amplitude ratio;  the Minxian-Zhangxian M6.6 earthquake;  the Lushan M7.0 earthquake
分类号:
P318
DOI:
-
摘要:
采用成都台和天水台GM4磁通门磁力仪秒采样地磁数据,计算得到这2个台站的20～230 s周期的谐波振幅比,发现该周期范围内的谐波振幅比在地震前出现的异常与10～60 min周期的谐波振幅比类似,主要表现为下降—转折—恢复上升的变化形态。成都台的谐波振幅比异常呈现南北方向和长短周期均不同步的特征,而天水台只有长短周期之间出现不同步现象。根据异常特征推测天水台位于岷县—漳县6.6级地震前的高导体区域内,而成都台则位于芦山7.0级地震前的高导体东侧边界附近。
Abstract:
This paper calculates the geomagnetic harmonic wave amplitude ratio with periods of 20～230 s by using the data of GM4 fluxgate magnetometer at the Chengdu station and Tianshui station.We find that the abnormal variations of geomagnetic harmonic wave amplitude ratio with periods of 20～230 s showed the characteristics of down-turning-recovery before earthquakes,which were same as the abnormal variations of geomagnetic harmonic wave amplitude ratio with periods of 10～60 min.At the Chengdu station,there was asynchronization between north-south direction and west-east direction,and also between long-period and short-period.However,the asynchronous phenomenon at the Tianshui station only existed between long-period and short-period.According to the anomaly characteristics,we infer that the Tianshui station was located in the high conductive body before the Minxian-Zhangxian M6.6 earthquake,and the Chengdu station located near the east border of the high conductive body before the Lushan M7.0 earthquake.

参考文献/References:


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备注/Memo

备注/Memo:
收稿日期:2017-01-21
基金项目:2015年度中国地震局青年震情跟踪课题《基于秒数据的地磁转换函数强震前变化特征研究》(2015010407)资助.

更新日期/Last Update: 2017-07-20