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In addition, the sightseeing limited express train "Aso Boy!" Where you can fully enjoy the Aso caldera.
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Lake bottom sediments in Aso and Nango valleys in the caldera..It is thought that lakes appeared at least three times in the caldera after the formation of the Aso caldera by geological surveys and boring surveys...In addition, the currently exposed central crater hills are nothing more than the mountain bodies formed from 8 years ago to the present in the latter half of the activity period, and the mountain bodies in the early stage of activity are buried in ejecta..
There are four Aso calderas called Aso-27, Aso-9, Aso-1, and Aso-2 that occurred 3 to 4 years ago.Pyroclastic flowFormed by the activity associated with the eruption of.The largest one was Aso-4, which released a large amount of pyroclastic material, and the pyroclastic flow was continuous on land at that time.Akiyoshidai(Yamaguchi )..The distance is as much as 160km. The vastness currently seen in the Aso-4 eruptionPyroclastic plateauWas formed.After thatErosionIt is believed that the caldera edge has expanded to the current size.The fact that Aso-4 volcanic ash covers the Japanese archipelago widely1982/Was noticed for the first time1985/Announced in..Also these 4 timesPyroclastic flowThe volume of the inner ring is estimated to be about 200 km.3Is.
- Main eruption age and eruption volume
- Aso1: About 26.6 years ago, Eruption volume 32 DRE km3.
- Aso2: About 14.1 years ago, Eruption volume 32 DRE km3.
- Aso3: About 13 years ago, Eruption volume 96 DRE km3.
- Aso4: Approximately 9 years ago, eruption volume 384 DRE km3.
Note) DRE (Dense Rock Equivalent)Converted magma eruption amount..The amount of eruption deposits is much higher than this.
The size of the Aso caldera
The size of Aso Caldera is often one of the largest in the worldAnd one of the best in the worldIs said.In addition, it is a funnel-shaped caldera like the Aso caldera, which forms a stable settlement inside the caldera and is wide.FarmlandCleared,National road,TrainIt is said that the example laid up to is rare in the world...The largest caldera in the world isIndonesia OfToba Caldera(Major diameter about 100km, minor diameter about 30km)..Like Toba CalderaBias type calderaThen, it is not uncommon to reach 70-80km.Also, in JapanKussharo Caldera(Major diameter about 26km, minor diameter about 20km) is the largest, and Aso is second only to this...Therefore, the Aso caldera is expressed as "the best in the world" or "the best in Japan".[Note 1]Will be different from the facts.
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- ^ a b c Setsuya Nakada (October 2002, 8). “Q & A about volcanoes (Question # 2509)”. Volcanological Society of Japan. 2021/10/24Browse.
- ^ Yukio Hayakawa. "Volcano Chapter 4 Volcano Shape”. Gunma University Faculty of Education Yukio Hayakawa Laboratory. 2021/10/24Browse.
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- Junko Fujii, Masashi Nakajima, Shiro Ishida, Seiji Matsuo "Aso 4 Tephra Ancient Geomagnetic Direction Distributed in Yamaguchi Prefecture", Quaternary Research, Vol. 39, No. 3, Japan Association for Quaternary Society, June 2000, 6 Sun, 1-227, two:10.4116 / jaqua.39.227.
- Yo Machida, Fusao Arai, Mitsugu Momose "Aso 4 Volcanic Ash: Wide Area of Distribution and Significance as Late Pleistocene Marker Layer", Volcano Vol. 30, Vol. 2, No. 1985, Japan Volcanic Society, July 7 1st of March, pp. 49-70, two:10.18940 / kazanc.30.2_49, NOT 110002989968.
- Koji Ono "(PDF) "Urban Kubota" Volume 22,Kubota Co., Ltd., September 1984, pp. 4-42.
- Shoichi Shimoyama "About the age of Aso 3 pyroclastic flow deposits (Aso-3) in the low-lying underground"Low Flatland Research," Volume 10, Saga University Low Flatland Disaster Prevention Research Center, August 2001, pp. 8-31, ISSN 09179445, NOT 110000579477, NCID AN10565818.
- Takahiro Yamamoto "(PDF) "Geological Survey of Japan Research Materials" Vol. 613, AIST Geological Survey of Japan, 2014.
- Masao Matsumoto; Hataro Matsumoto "Aso Volcano-The World's No. 1981 Caldera" Tokai University Press, May 5, 1.ISBN 978-4486005971.