Japan Geoscience Union Meeting 2022

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[U-09] Submarine volcanic eruption in Tonga accompanied by a meteo-tsunami

Mon. May 30, 2022 11:00 AM - 1:00 PM Online Poster Zoom Room (40) (Ch.40)

convener:Toshiyuki Hibiya(Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo), convener:Fukashi Maeno(Earthquake Research Institute, University of Tokyo), convener:Kensuke Nakajima(Department of Earth and Planetary Sciences,Flculty of Sciences,Kyushu University), convener:Yoshihiko Tamura(Research Institute for Marine Geodynamics, Japan Agency for Maine-Earth Science and Technology), Chairperson:Toshiyuki Hibiya(Department of Ocean Sciences, Tokyo University of Marine Science and Technology), Fukashi Maeno(Earthquake Research Institute, University of Tokyo), Kensuke Nakajima(Department of Earth and Planetary Sciences,Flculty of Sciences,Kyushu University), Yoshihiko Tamura(Research Institute for Marine Geodynamics, Japan Agency for Maine-Earth Science and Technology)

11:00 AM - 1:00 PM

[U09-P33] Rapid Conjugate Appearance of the Giant Ionospheric Lamb Wave in the Northern Hemisphere After Hunga-Tonga Volcano Eruptions

*Charles Lin1, Jia-Ting Lin1, P. K. Rajesh1, Min-Yang Chou2, Jann-Yenq LIU3, Jia Yue2, Tung-Yuan Hsiao4, Ho-Fang Tsai1 (1.Department of Earth Sciences, National Cheng Kung University, Tainan, Taiwan, 2.NASA Goddard Space Flight Center, Community Coordinated Modeling Center, Greenbelt, MD, USA, 3.Department of Space Science and Engineer, National Central University, Taoyuan, Taiwan, 4.Nuclear Science and Technology Development Center, National Tsing Hua University, Hsinchu, Taiwan)

Keywords:Concentric Traveling Ionospheric Disturbances , Magnetic Conjugate, Lamb wave, gravity wave

The explosive eruption of the Hunga-Tonga volcano in the southwest Pacific at 0415UT on 15 January 2022 triggered gigantic atmospheric disturbances with surface air pressure waves propagating around the globe in Lamb mode. In space, concentric traveling ionosphere disturbances (CTIDs) are also observed as a manifestation of air pressure waves in New Zealand ~0500UT and Australia ~0630UT. As soon as the air pressure waves reached central Australia ~0800UT, conjugate CTIDs appeared almost simultaneously in the northern hemispheres through interhemispheric coupling, much earlier than the arrival of the surface air pressure waves to Japan after 1100UT. Combining observations over Australia and Japan between 0800-1000UT, both direct and conjugate CTIDs show similar horizontal phase velocities of 320-390 m/s, matching with the dispersion relation of Lamb mode. The arrival of atmospheric Lamb wave to Japan later created in situ CTIDs showing the same Lamb mode characteristics as the earlier conjugate CTIDs.