A Statistical Study of the Correlation between Geomagnetic Storms and M ≥ 7.0 Global Earthquakes during 1957–2020 |
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| Authors: | Hongyan Chen Rui Wang Miao Miao Xiaocan Liu Yonghui Ma Katsumi Hattori Peng Han |
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| Institution: | 1.Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen 518055, China; (H.C.); (R.W.); (M.M.);2.The Institute of Geophysics China Earthquake Administration, Beijing 100081, China;3.School of Science, Harbin Institute of Technology, Shenzhen 518055, China;4.Graduate School of Science, Chiba University, Chiba 263-8522, Japan;5.Center for Environmental Remote Sensing, Chiba University, Chiba 263-8522, Japan |
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| Abstract: | In order to find out whether the geomagnetic storms and large-mega earthquakes are correlated or not, statistical studies based on Superposed Epoch Analysis (SEA), significance analysis, and Z test have been applied to the Dst index data and M ≥ 7.0 global earthquakes during 1957–2020. The results indicate that before M ≥ 7.0 global earthquakes, there are clearly higher probabilities of geomagnetic storms than after them. Geomagnetic storms are more likely to be related with shallow earthquakes rather than deep ones. Further statistical investigations of the results based on cumulative storm hours show consistency with those based on storm days, suggesting that the high probability of geomagnetic storms prior to large-mega earthquakes is significant and robust. Some possible mechanisms such as a reverse piezoelectric effect and/or electroosmotic flow are discussed to explain the statistical correlation. The result might open new perspectives in the complex process of earthquakes and the Lithosphere-Atmosphere-Ionosphere (LAI) coupling. |
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| Keywords: | statistical study geomagnetic storm earthquakes superposed epoch analysis |
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