Presentation Information
[PEM13-P13]Atmospheric modes excited by the 2021 August eruption of the Fukutoku-Okanoba volcano observed by QZSS-TEC
*Tatsuya Fujimoto1, Kosuke Heki1 (1.Hokkaido University)
Keywords:
GNSS,GPS,QZSS,TEC,Fukutoku-Okanoba
Continuous Plinian eruptions of volcanoes often excite atmospheric resonant oscillations with several distinct periods of a few minutes. We detected such harmonic oscillations by the 2021 August Plinian eruption of the Fukutoku-Okanoba volcano, a submarine volcano in the Izu-Bonin arc, in ionospheric total electron content (TEC) observed from global navigation satellite system (GNSS) stations deployed on three nearby islands, Chichijima, Hahajima, and Iwojima. Continuous records with the geostationary satellite (J07) of Quasi-Zenith Satellite System (QZSS) presented four frequency peaks of such atmospheric modes, 3.7, 4.4, 4.8, and 5.4 mHz. The harmonic TEC oscillations commenced at ~5:16 UT with a large amplitude but decayed in a few hours.