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Investigation on the statistical characteristics of geoelectric field seismic anomalies in the North–South seismic belt of Chinese mainland

  • Research Article - Solid Earth Sciences
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Abstract

Geoelectric field (GEF) measurements have documented many pre-earthquake electromagnetic anomalies over the past few decades. However, the statistical characteristics between earthquakes and GEF are still unclear. In this paper, we use the shifting correlation method to analyze the statistical features of earthquake precursory information in GEF data recorded in the North–South seismic belt of Chinese mainland during 2010–2019. Three factors, seismic energy, epicentral distance (D), and the fault, were used to select the seismic events. In the analysis section, the results of two significance test methods were used as the anomaly standard. The results show that the GEF anomalies associated with seismic events appear about 30 days before the earthquakes, and the anomalies appear earlier at stations farther away from the epicenter. In addition, the selective characteristics of the GEF are strongly correlated with the location of stations and the geological-tectonic environment in which the epicenter is located. Moreover, the results approved the empirical conclusion that the larger the seismic energy is, the larger the impact area is. The statistical characteristics of the seismic GEF anomalies in the North–South seismic belt of Chinese mainland may provide technical support for exploring the phenomenon and mechanism of seismic GEF.

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Acknowledgements

We would like to thank the China Earthquake Network Center for providing observation data for the GEF and earthquake catalogue. We also thank Prof. Chen Xiaobin and Dr. Jiang Feng (Institute of geology of CEA) for providing the original program. We also thank GMT for providing the mapping support. This work was funded by the Gansu Province Science and Technology Plan Project (No. 20JR10RA498) and Earthquake Science Spark Program of China Earthquake Administration (XH16037). The authors wish to thank the editor and the reviewer for their fruitful comments on an earlier version of the paper.

Funding

This work was funded by the Gansu Province Science and Technology Plan Project (No. 20JR10RA498) and Earthquake Science Spark Program of China Earthquake Administration (XH16037).

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Contributions

All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by HZY, AZH, and FYY. The first draft of the manuscript was written by HZY, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to An Zhang-Hui.

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The authors have no conflict of interests to declare that are relevant to the content of this article.

Data availability

The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.

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Custom code.

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Written informed consent for publication was obtained from all participants.

Additional information

Communicated by Dr. Nikolay Palshin (ASSOCIATE EDITOR)/Prof. Ramon Zuñiga (CO-EDITOR-IN-CHIEF).

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Ze-Yu, H., Zhang-Hui, A., Ying-Ying, F. et al. Investigation on the statistical characteristics of geoelectric field seismic anomalies in the North–South seismic belt of Chinese mainland. Acta Geophys. 69, 2085–2097 (2021). https://doi.org/10.1007/s11600-021-00661-y

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  • DOI: https://doi.org/10.1007/s11600-021-00661-y

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