Notes on the Geology of Kuchi-no-erabu Volcano, Southern Japan

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  • 口永良部島地質調査報告
  • クチエラブジマ チシツ チョウサ ホウコク

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Abstract

Kuchi-no-erabu volcano, about 70 km south of Kyushu, Japan, consists of dissected aggregates of older volcanic bodies covered by several younger cones. Most of the rocks are hypersthene-augite andesite. Shin-dake, the youngest cone, has been frequently active, displaying a Vulcanian-type eruptions at the summit crater. The cone is made up of stratified pyroclastic material with a few thick lava flows reaching the sea coast. The 1966 eruption of Shin-dake produced only accessory blocks, lapilli, and ash and no essential material was found. Very small-scale, low-temperature pyroclastic flow was produced at the time of the eruption. A deposit of welded pyroclastic materials on the western coast as described by MATUMOTO (1934) appears to be a product of local pyroclastic eruption.

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