If the behemoth volcano were to erupt, researchers say that it has the potential to kill 100 million people. Numerical simulations by Maeno, Imamura, and Taniguchi and Maeno and Imamura suggest that tsunamis generated by caldera collapse taking place over a period of several hours during the 7.3 ka Kikai eruption would have reached run‐up heights of more than 20 m on the southern coasts of the Satsuma and Osumi peninsulas, on the western side of Tanegashima Island, and on the northern side … It ejected about 150 cubic kilometers of rhyolithic magma, i.e. This ultra-plinian eruption of Kikai around 4350 BC was one of the largest Holocene eruptions on the planet. Three large silica-rich eruptions have been produced by Kikai. The topography of caldera is 20 by 17 km in horizontal across and ~ 500 m in depth (Maeno and Taniguchi, 2007, Matsumoto, 1943, Ono et al., 1982). The most recent caldera-forming eruption was about 6,300 years ago and was the largest eruption on Earth in the last 10,000 years. The most recent caldera-forming eruption was about 6,300 years ago and was the largest eruption on Earth in the last 10,000 years. Entire area of the Kikai Caldera is covered by sea except for two islands (Iwojima and Takeshma) on the northern caldera rim. 3 times more than the largest historic eruption, the 1815 Tambora eruption! Iwodake (Iwojima) Kikai Caldera was the site of the VEI 7 Kikai-Akahoya eruption, one of the largest eruptions in the last 10,000 years, paralleling the more famous but less powerful eruption of Krakatau in 1883 in that massive pyroclastic flows travelled across the sea, devastating mainland settlements. 2. The eruption produced about 150 km³ of material, giving it a Volcanic Explosivity Index of 7 and making it one of the most explosive in the last 10,000 years. A few areas on the caldera rim lie above water (figure 2). The most recent caldera-forming eruption was about 6,300 years ago and was the largest eruption on Earth in the last 10,000 years. This was the first eruption recorded since 2 November 2019. The ground surface then collapses downward into the emptied or partially emptied magma chamber, leaving a massive depression at the … Secondly, the Kikai Caldera caused the most recent giant caldera-forming eruption in the Japanese archipelago (7300 years ago), and there is a high possibility that … The Akahoya eruption of Kikai around 4350 BC. Caldera: a depression in the land formed when a volcano erupts; 2. Eruptive history before the 7.3 ka eruption Volcanic activities in the Kikai caldera began about 700 ka (Ono et al., 1982). The Akahoya eruption produced 70–80 km 3 in dense rock equivalent (DRE) of magmas (Maeno & Taniguchi, 2007). Minor eruptions occur frequently on Mount Io, one of the post-caldera subaerial volcanic peaks on Iojima. Kikai is still an active volcano. Minor eruptions occur frequently on Mount Io, one of the post-caldera subaerial volcanic peaks on Iojima. When large volumes of magma are erupted over a short time, structural support for the rock above the magma chamber is lost. Kikai is the southernmost and most recent of a series of N-S … Kikai is a 17 x 20 km mostly submarine caldera as close as ~40 km from the S margin of the island of Kyushu (see figure 1 in BGVN 37:07; also see Shinohara and others, 2002, for 16 journal articles devoted to this volcano. About 150 cubic km of ash was erupted. The outline of the Kikai Caldera was shaped by the VEI 7 Akahoya eruption at around 7.3 ka. Numerical simulation of tsunamis generated by caldera collapse during the 7.3 ka Kikai eruption, Kyushu, Japan Fukashi Maeno1,2, Fumihiko Imamura3, and Hiromitsu Taniguchi4 1Institute of Mineralogy, Petrology, and Economic Geology, Graduate School of Science, Tohoku University, Aoba, Aoba-ku, Sendai 980-8578, Japan 2Earhquake Research Institute, Tokyo University, 1-1-1, Yayoi, …

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