[M-IS10] Interdisciplinary studies on pre-earthquake processes

[MIS10-07] Ionospheric GNSS TEC Disturbances Associated with the 15 January 2022 Tonga Volcano Eruption

*Jann-Yenq LIU¹, CHIYEN LIN¹, YUN-CHENG WEN², Katsumi Hattori³ (1.Center for Astronautical Physics and Engineering, National Central University, Taiwan, 2.Department of Space Science and Engineering, National Central University, Taiwan, 3.Department of Earth Sciences, Graduate School of Science, Chiba University, Japan)

Keywords:Tonga volcano, traveling ionospheric disturbance, earthquake

At 04:15 UT, intense eruptions of the Tonga volcano (20.6°S 175.4°W) generated atmospheric shocks and pressure fluctuations, which induced traveling atmospheric disturbances near the Earth’s surface, further went into the upper atmosphere, and activated traveling ionospheric disturbances (TIDs) on 15 January 2022. Following the eruption, an M 6.2 occurred at 225 km WNW of Pangai, Tonga (19.1°S 176.3°W) with 4.2 km depth on 27 January 2022. The total electron content of worldwide ground-based GNSS receivers and the global ionosphere map (GIM) are employed to find disturbances and TIDs. The GIM shows that anomalous TEC increases frequently appear specifically over the volcano 7-10 days before the eruption. Meanwhile, various TIDs induced by atmospheric shocks and pressure fluctuations owing to the volcano eruption as well as tsunami waves will be reported.