Earthquake Electromagnetic Precursor Anomalies Detected by a New Ground-based Observation Network

doi:10.11947/j.JGGS.2021.0114

Journal of Geodesy and Geoinformation Science ›› 2021, Vol. 4 ›› Issue (1): 116-123.doi: 10.11947/j.JGGS.2021.0114

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Earthquake Electromagnetic Precursor Anomalies Detected by a New Ground-based Observation Network

Bing HAN¹(),Guoze ZHAO¹(),Lifeng WANG¹,Ji TANG¹,Yaxin BI²,Yan ZHAN¹,Xiaobin CHEN¹,Qibin XIAO¹,Jihong ZHANG³

1. The State Key Laboratory of Earthquake Dynamics. Institute of Geology, China Earthquake Administration, Beijing 100029, China
2. Computer Science Research Institute, Faculty of Computing and Engineering, University of Ulster, Belfast BT37 0QB, U.K.
3. Shandong Earthquake Administration, Jinan 250014, China

Received:2020-10-10 Accepted:2020-12-25 Online:2021-03-20 Published:2021-04-06
Contact: Guoze ZHAO E-mail:zddhb@163.com;zhaogz@ies.ac.cn
About author:Han Bing (1988-), female, research assistant, majors in MT data processing and analyzing. E-mail: zddhb@163.com
Supported by:
National Development and Reform Committee of China(15212Z0000001);National Science Foundation of China(41374077)

Abstract

Abstract:

It is a debated topic if there are any observable precursor anomalies prior to the earthquake (EQ hereafter) and if the stronger EQ can be successfully predicted. During last few decades quite a lot of observable electromagnetic (EM) precursors were published by using techniques equipped in either satellites or on ground-based stations. But there are only a few cases that the short-term precursor anomalies of EM field before earthquakes were observed by using alternate EM fields on ground. This paper will present a new EM observation network built in recent years and show a new finding of EM field with the variation of a one-year cycle observed using the network. As an example, the short-term precursor anomalies of apparent resistivity before the Yangbi EQ (Ms 5.1) occurred on March 27, 2017 in Yunnan Province will be studied. The observed anomalous phenomena indicate that the anomaly before the EQ can be captured only if reasonable effective methods including sophisticated analytical techniques are used, and it is believed that continuously observed data on the fixed observation network for a long time is an effective means for studying anomalies that appeared before earthquakes. This network can also play an important role in studying the EM environment from space.

Key words: electromagnetic observation network; natural EM phenomena; precursor anomaly; apparent resistivity; space EM environment

Bing HAN,Guoze ZHAO,Lifeng WANG,Ji TANG,Yaxin BI,Yan ZHAN,Xiaobin CHEN,Qibin XIAO,Jihong ZHANG. Earthquake Electromagnetic Precursor Anomalies Detected by a New Ground-based Observation Network[J]. Journal of Geodesy and Geoinformation Science, 2021, 4(1): 116-123.

Figures/Tables 6

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Earthquake Electromagnetic Precursor Anomalies Detected by a New Ground-based Observation Network

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