韓半島と済州島で見出された九州起源の広域テフラ

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Machida and Arai (1976 and 1978) reported two widespread tephras of latest Quaternary age, the Kikai-Akahoya and Aira-Tn ashes, which were produced by gigantic eruptions of the Kikai and Aira calderas respectively in southern Kyushu. These have been used as excellent time-markers in late Quaternary sequences in Japan. In this paper these two tephras are reported in Korea. Accurate determinations of refractive index of the specific volcanic glass contained in the soil are used as the most useful criteria for quick characterization of these tephras, together with stratigraphic nature. As a result, the Kikai-Akahoya ash is recognized at two localities and Aira-Tn ash at four localities in southeastern part of Korean peninsula and Cheju island. These tephras are of great significance in volcanology as well as Quaternary research not only in Japan but also in Korea.
社団法人東京地学協会の論文