The aira and ata pyroclastic flows and related caldera and depressions in southern Kyushu, Japan

書誌事項

公開日
1966-12
権利情報
  • http://www.springer.com/tdm
DOI
  • 10.1007/bf02597139
公開者
Springer Science and Business Media LLC

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説明

The southern part of Kyushu is an area covered by many extensive sheets of pyroclastic tlow(~) deposits welded or not welded. Among these, two younger, large-scale sheets, here named Aira and Ata pyroclastic flow deposit respectively, are the most conspicuous. The Aira pyroclastic flow deposit occupies a wide area surrounding the northern end of Kagoshima Bay. A general distribution of the deposit is given by MATUMOTO (1943, Plate VI). Matumoto considers that the Aira pyroclastic flows were erupted from a vent located at the northern end of Kagoshima Bay and now concealed below water. As a result of the eruption, a caldera was formed which he named Aira (Fig. 1). Ata caldera was likewise named by MATUMOTO (1943) as he interpreted an area of depression in the southernmost part of Kyushu (Fig. 1, indicated as ATA) was formed by collapse around the vent area just after the eruption of the Ata pyroclastic [lows. This paper is a preliminary report of our study in the geology and petrology of the Aira and Ata pyroclastic flow deposits and related caldera and other types of depressions. Part of a more detailed account has been published elswhere (ARAniA~I and Ul, 1966). In Fig. 2~ the general sequence of geologic units in this area is shown.

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