Scholarlink

<p>This study investigates the ionospheric disturbances triggered by the 2024 Mw 7.4 Hualien earthquake using a dense network of ground-based GNSS receivers and space-borne FORMOSAT-7/COSMIC-2 (F7/C2) radio occultation (RO) data. Utilizing high-rate 1-Hz GNSS data and an optimal ionospheric shell height of ~ 280&#xa0;km determined by semi-variance analysis, we observed distinct concentric traveling ionospheric disturbances. These disturbances propagated with initial horizontal velocities of ~ 780–820&#xa0;m/s, decelerating to ~ 200&#xa0;m/s, which is consistent with the propagation of acoustic-gravity waves (AGWs). Notably, no significant ionospheric signatures associated with seismic Rayleigh waves were detected, suggesting that the excitation of such disturbances is dependent on the earthquake magnitude. A key novelty of this study is the vertical characterization of these disturbances using F7/C2 RO data, which revealed dominant vertical wavelengths of 30–50&#xa0;km concentrated at altitudes of 100–250&#xa0;km. These results provide rare, multi-dimensional observational evidence of earthquake-induced AGWs propagating through the lower thermosphere, offering constraints for lithosphere–atmosphere–ionosphere coupling models.</p> Graphical Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

A multi-instrumental study of ionospheric disturbances associated with the 2024 Mw 7.4 Hualien earthquake

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年4月6日

查看全文
  • Chia-Hung Chen,
  • Yung-Ming Wang,
  • I.-Te Lee

摘要

This study investigates the ionospheric disturbances triggered by the 2024 Mw 7.4 Hualien earthquake using a dense network of ground-based GNSS receivers and space-borne FORMOSAT-7/COSMIC-2 (F7/C2) radio occultation (RO) data. Utilizing high-rate 1-Hz GNSS data and an optimal ionospheric shell height of ~ 280 km determined by semi-variance analysis, we observed distinct concentric traveling ionospheric disturbances. These disturbances propagated with initial horizontal velocities of ~ 780–820 m/s, decelerating to ~ 200 m/s, which is consistent with the propagation of acoustic-gravity waves (AGWs). Notably, no significant ionospheric signatures associated with seismic Rayleigh waves were detected, suggesting that the excitation of such disturbances is dependent on the earthquake magnitude. A key novelty of this study is the vertical characterization of these disturbances using F7/C2 RO data, which revealed dominant vertical wavelengths of 30–50 km concentrated at altitudes of 100–250 km. These results provide rare, multi-dimensional observational evidence of earthquake-induced AGWs propagating through the lower thermosphere, offering constraints for lithosphere–atmosphere–ionosphere coupling models.

Graphical Abstract