[M-TT45] インフラサウンド及び関連波動が繋ぐ多圏融合地球物理学の新描像

[MTT45-06] 2022年1月トンガ大噴火による全国25箇所の観測波形からインフラサウンド観測網の津波防災への有用性を考える

*山本 真行¹ (1.高知工科大学　システム工学群)

キーワード：インフラサウンド、トンガ噴火、津波防災

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.