Japan Geoscience Union Meeting 2021

Presentation information

Print

[E] Oral

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS08] Interdisciplinary studies on pre-earthquake processes

Sun. Jun 6, 2021 1:45 PM - 3:15 PM Ch.22 (Zoom Room 22)

convener:Katsumi Hattori(Department of Earth Sciences, Graduate School of Science, Chiba University), Dimitar Ouzounov(Center of Excellence in Earth Systems Modeling & Observations (CEESMO) , Schmid College of Science & Technology Chapman University, Orange, California, USA), Jann-Yenq LIU(Department of Space Science and Engineering, National Central University, Taiwan), Qinghua Huang(Peking University), Chairperson:Peng Han(Southern University of Science and Technology, Shenzhen, China), Xuemin Zhang(Institute of Earthquake Forecasting, China Earthquake Administration)

3:00 PM - 3:15 PM

[MIS08-12] A Statistical Study of the Correlation Between Geomagnetic Storms and M>7.0 Global Earthquakes During 1957–2020

*Hongyan Chen1, Rui Wang1, Miao Miao1, Xiaocan Liu2, Yonghui Ma3, Katsumi Hattori4, Peng Han1 (1.Southern University of Science and Technology, Shenzhen, China, 2.The Institute of Geophysics China Earthquake Administration, Beijing, China, 3.School of Science, Harbin Institute of Technology, Shenzhen, China, 4.Graduate School of Science, Chiba University, Chiba, Japan)


Keywords:Statistical study, Geomagnetic storm, Earthquakes, Superposed epoch analysis

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 to 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.