Japan Geoscience Union Meeting 2025

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[E] Poster

P (Space and Planetary Sciences ) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM12] Coupling Processes in the Atmosphere-Ionosphere System

Sun. May 25, 2025 5:15 PM - 7:15 PM Poster Hall (Exhibition Hall 7&8, Makuhari Messe)

convener:Keisuke Hosokawa(Department of Communication Engineering and Informatics, University of Electro-Communications), Huixin Liu(Earth and Planetary Science Division, Kyushu University SERC, Kyushu University), Yuichi Otsuka(Institute for Space-Earth Environmental Research, Nagoya University), Loren Chang(Department of Space Science and Engineering, National Central University)

5:15 PM - 7:15 PM

[PEM12-P34] Analysis of Earthquake-Induced Ionospheric Plasma Disturbances: A Case Study of the 2024 Hualien Earthquake, Taiwan

*Chia-Hung Chen1, Yung-Ming Wang1, I-Te Lee2 (1.Department of Earth Sciences, National Cheng Kung University, 2.Taiwan Space Agency)

Keywords:Hualien earthquake, FORMOSAT-7/COSMIC-2, GNSS TEC, Seismo-ionospheric phenomena

This study analyzes ionospheric disturbances triggered by the 2024 Hualien earthquake in Taiwan. By integrating Total Electron Content (TEC) observations from ground-based Global Navigation Satellite System (GNSS) networks with radio occultation data from the FORMOSAT-7/COSMIC-2 satellite, this research provides new insights into seismo-ionospheric phenomena. A key finding is the first-time observation in Taiwan of a concentric circular disturbance structure in the ionosphere following an earthquake, which is similar to the disturbances observed after the 2011 Tohoku earthquake in Japan. Furthermore, the study calculated the propagation speeds of the disturbance waves, suggesting that their propagation characteristics may be influenced by geomagnetic effects. The results of this study contribute to a better understanding of the coupling mechanisms between earthquakes and the ionosphere.