鬼界カルデラ，６．５ｋａ　ＢＰ噴火に誘発された２度の巨大地震

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書誌事項

タイトル別名
  • Two Large-scale Earthquakes Triggered by a 6.5 ka BP Eruption from Kikai Caldera, Southern Kyushu, Japan.
  • キカイ カルデラ 6 5kaBP フンカ ニ ユウハツ サレタ 2ド ノ キョダイジシン

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抄録

Many clastic dykes are found not only in southern Kyushu but also in Tanegashima and Yakushima islands far south of Kyushu, which are closely related to the 6.5ka BP eruption from Kikai caldeara. Clastic dykes found in southern Kyushu are mainly sand dykes which were formed by the liquefaction of fluvial deposits. Similar dykes are also found in Tanegashima and Yakushima islands; these which are composed mainly of breccia and/or pebbles probably derived from talus and/or terrace deposits. Those dykes penetrate the overlying soil layers and reach the tephra of the 6.5ka BP eruption of Kikai caldera. Tephra sequence from this eruption consists of plinian pumice, ignimbrite, and co-ignimbrite ash (Akahoya ash) in ascending order.<br>Field evidence suggests that breccia dykes observed in Tanegashima and Yakushima islands were formed shortly before, or at nearly the same time as, the ignimbrite eruption. However, sand dykes observed in southern Kyushu were formed in two different stages. The first group was formed at the same time as breccia dykes in Tanegashima and Yakushima islands. The second group occurred a bit later: that is, liquefied material is apparently intercalated in co-ignimbrite ash (K-Ah). This evidence indicates that two large-scale earthquakes occurred during the 6.5ka BP eruption from Kikai caldera. The first earthquake occurred around Tanegashima and Yakushima islands was quite severe, and affected a wide area of southern Kyushu. The second one, which occurred a bit north of the first one, is also considered to be a large-scale earthquake.

収録刊行物

  • 第四紀研究

    第四紀研究 41 (4), 287-299, 2002

    日本第四紀学会

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