摘要
地震前的电磁扰动现象曾被多次观测到,但需进一步研究。在中国地震局的支持下,可以监测电磁扰动数据的多分量地震监测系统——AETA在中国境内已经布设了200余套。2017年8月8日,四川省九寨沟县发生7级地震。震中周边500 km范围内当时已经布设22套AETA设备。基于滑动四分位距法(时间窗为27 d)分析了这些台站震前30 d的数据。11个台站出现了异常,其中震中周边200 km内的6个台站有4个发生异常。同时,正异常明显多于负异常。另外,大部分异常发生在夜间(20时~6时)。
Electromagnetic disturbance phenomena before earthquakes have been observed for many times,however the correlation should be further studied.We designed a multi-component seismic monitoring system-AETA,to monitor the electromagnetic disturbance.At present more than 200 AETA devices have been deployed in China under the support of the Chinese Earthquake Administration.On August 8,2017,a large M_S7.0 earthquake occurred in Jiuzhaigou county of Sichuan Province,China.There are 22 sets of devices installed at seismic stations within the 500 km range of the epicenter.We analyzed the observation data of 30 days before and after the earthquake using the sliding interquartile method and a 27-day window.The result shows that abnormal signal appeared at 11 stations.Among them,4 out of 6 stations within 200 km around the epicenter have anomalies.And the positive anomaly is much more than the negative anomaly.Besides,most anomalies occurred during night time(20:00~6:00).
作者
黄继攀
王新安
雍珊珊
王墨
刘众
HUANG Ji-pan;WANG Xin-an;YONG Shan-shan;WANG Mo;LIU Zhong(The Key Laboratory of Integrated Micro-systems Science and Engineering Applications,Peking University Shenzhen Graduate School,Guangdong Shenzhen 518055,China;The Research Center of Earthquake Monitoring and Forecasting Technology,Peking University Shenzhen Graduate School,Guangdong Shenzhen 518055,China;School of Electronics Engineering and Computer Science,Peking University,Beijing 100871,China)
出处
《地震》
CSCD
北大核心
2019年第3期84-94,共11页
Earthquake
基金
深圳市科技创新计划项目(KJYY20170721151955849
JCYJ20170412151159461)
关键词
九寨沟地震
电磁扰动
时间序列分析
异常
The 2017 Jiuzhaigou Earthquake
Electromagnetic Disturbance
Time-series analysis
Anomaly