Japan Geoscience Union Meeting 2022

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[J] Oral

M (Multidisciplinary and Interdisciplinary) » M-TT Technology & Techniques

[M-TT45] Brand-new scope of coupling geophysics being established by infrasound and associated waves

Sun. May 22, 2022 3:30 PM - 5:00 PM 202 (International Conference Hall, Makuhari Messe)

convener:Masa-yuki Yamamoto(Department of systems engineering, Kochi University of Technology), convener:Mie Ichihara(Earthquake Research Institute, University of Tokyo), convener:Takayuki Otsu(Japan Weather Association), Chairperson:Takayuki Otsu(Japan Weather Association), Yasuhiro Nishikawa(Kochi University of technology. School of System Engoneering.)

4:45 PM - 5:00 PM

[MTT45-06] Considering the usefulness of infrasound observation network for tsunami disaster mitigation based on observed waveforms at 25 sites during the January 2022 Tonga eruption

*Masa-yuki Yamamoto1 (1.Department of systems engineering, Kochi University of Technology)

Keywords:Infrasound, Tonga eruption, Tsunami disaster mitigation

Since 2016, Kochi University of Technology (KUT) have been installed more than 30 infrasound sensors of SAYA INF01 type in Japan consisting KUT Infrasound Sensor Network for investigating early tsunami warning application, and in 2019 the nation-wide infrasound observation network with the infrasound observation consortium was established. On Jan. 15, 2022, a volcanic eruption was occurred in Tonga and the pressure waves generated by the eruption were propagated for a long distance to Japan in about 7 hours. The KUT Infrasound Sensor Network successfully detected the strong amplitude and long-lasting infrasonic signals with 25 observation sites in working at the time of signal arrival. The signal shows almost similar at every site from Hokkaido to Kyushu, implying the signal arrival of very coherent and huge scale disturbances ever than before. Here, we will introduce characteristics of the detected infrasonic signals as well as detailed analysis of considerable 3 types of the propagation in atmosphere and discuss possibilities of arising some coupling events during the propagation for about 8000 km from Tonga to Japan over Pacific ocean.