Remarkable variations in geomagnetic disturbances preceding the 2017 M 7.1 Jiuzhaigou earthquake

IF 1.9 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Physics of the Earth and Planetary Interiors Pub Date : 2025-09-09 DOI:10.1016/j.pepi.2025.107438

Yiliang Guan , Xiaona Dong , Lili Feng , Manqiu He , Yingfeng Ji

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引用次数: 0

Abstract

With the rapid development of geomagnetic observation networks and the increased availability of geomagnetic data in China over the past decade, multistation geomagnetic data analyses have become widely used in studies of earthquake precursors with magnitudes >6. Building on the single-station polarization algorithm, we propose a multistation daily sliding polarization correlation algorithm for detecting regional geomagnetic anomalies. This method can be applied to analyze the spatiotemporal evolution of geomagnetic field anomalies that are related to seismogenic processes before major earthquakes. In this study, we calculate polarization correlation time series data before and after the 2017 M 7.1 Jiuzhaigou earthquake. The results show that following the appearance of polarization anomalies, the regional correlations increase, then decrease, and subsequently increase again. Earthquakes occurred at the inflection points of these correlation trends. Our analysis suggests that changes in multistation polarization correlations directly reflect regional geomagnetic field anomalies that are caused by tectonic activity, thereby capturing the dynamic evolution during earthquake preparation. This method offers valuable insights into the mechanisms linking geomagnetic polarization anomalies with seismic events.

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2017年九寨沟7.1级地震前地磁扰动的显著变化

近十年来，随着中国地磁观测网的快速发展和地磁资料可获得性的提高，多站地磁资料分析已广泛应用于震级地震前兆研究。在单站极化算法的基础上，提出了一种用于区域地磁异常检测的多站日滑动极化相关算法。该方法可用于分析大地震前与发震过程有关的地磁场异常的时空演变。本研究计算了2017年九寨沟7.1级地震前后的极化相关时间序列数据。结果表明：极化异常出现后，区域相关性先增大后减小，再增大；地震发生在这些相关趋势的拐点上。分析表明，多站极化相关性的变化直接反映了构造活动引起的区域地磁场异常，从而捕捉了地震准备过程中的动力演化。这种方法为地磁极化异常与地震事件的联系机制提供了有价值的见解。

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来源期刊

Physics of the Earth and Planetary Interiors 地学天文-地球化学与地球物理

CiteScore

5.00

自引率

4.30%

发文量

审稿时长

18.5 weeks

期刊介绍： Launched in 1968 to fill the need for an international journal in the field of planetary physics, geodesy and geophysics, Physics of the Earth and Planetary Interiors has now grown to become important reading matter for all geophysicists. It is the only journal to be entirely devoted to the physical and chemical processes of planetary interiors. Original research papers, review articles, short communications and book reviews are all published on a regular basis; and from time to time special issues of the journal are devoted to the publication of the proceedings of symposia and congresses which the editors feel will be of particular interest to the reader.