Periodic electromagnetic signals as potential precursor for seismic activity  

一种反应地震前兆活动的周期性电磁信号

作　　者：YONG Shan-shan WANG Xin-an ZHANG Xing GUO Qin-meng WANG Jing YANG Chao JIANG Bing-hui 雍珊珊;王新安;张兴;郭琴梦;王晶;杨超;蒋冰慧(Key Laboratory of Integrated Micro-Systems Science and Engineering Applications,Peking University Shenzhen Graduate School,Shenzhen 518055,China;School of Electronics Engineering and Computer Science,Peking University,Beijing 100871,China)

机构地区：[1]Key Laboratory of Integrated Micro-Systems Science and Engineering Applications,Peking University Shenzhen Graduate School,Shenzhen 518055,China [2]School of Electronics Engineering and Computer Science,Peking University,Beijing 100871,China

出　　处：《Journal of Central South University》2021年第8期2463-2471,共9页中南大学学报（英文版）

基　　金：Projects(KJYY20170721151955849,JCYJ20190808161401653)supported by Fundamental Research Grant from Shenzhen Science&Technology,China。

摘　　要：Electromagnetic signals may be a promising precursor to seismic activity which has been observed in many case studies in past decades.However,the correlation and causation between the electromagnetic signals and the seismic activity are still unclear without intensive observation network.In order to find seismoelectromagnetic phenomenon,we deployed AETA(acoustic and electromagnetic testing all-in-one system),a high-density multi-component seismic monitoring system in the China Earthquake Science Experiment site(CESE,in Sichuan Province and Yunnan Province,China)and the capital circle(areas with a distance which is≤200 km from Beijing),to record electromagnetic and geo-acoustic data across 0.1 Hz−10 kHz.In the course of data collection,we discovered an electromagnetic waveform that occurs on a daily basis.Because the signal generally coincides with sunrise and sunset,we named this phenomenon the SRSS(Sunrise-Sunset)waveform.After conducting three statistical tests based on seismicity and SRSS,we determined that the SRSS waveform is roughly correlated with the onset of seismic activity.It generally occurs at the regions where seismicity occurs.This discovery might have significant implications with respect to the future of earthquake prediction.电磁信号是反应地震前兆活动的重要信号,在过去几十年里有很多观测震例和研究实验。但是,由于没有密集的观测网获取大量的真实数据,电磁信号和地震活动之间的相关性尚不清楚。为了找到地震强相关的电磁现象,在川滇地区和首都圈布设了高密度的多分量地震监测系统(AETA),来观测0.1Hz~10k Hz的电磁和地声数据。在数据的采集中,发现了电磁信号的波形呈现日周期的特性。该信号的变化与日升日落同步,因此命名为日升日落波SRSS(Sunrise-Sunset)。本文通过三次震例分析,发现SRSS波与地震事件具有强相关性,该信号通常出现在地震活跃的区域。SRSS波与地震相关性对地震预测意义重大。

关 键 词：seismic precursor periodic electromagnetic signal Sunrise-Sunset(SRSS)waveform 

分 类 号：P315.7[天文地球—地震学]