Rapid cooling of Volcano Nishinoshima-shinto, the Ogasawara Islands (Part2) : Interpretations

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  • 西之島新島の急速な冷却(その2) : 観測結果の解釈
  • 西之島新島の急速な冷却-2-観測結果の解釈
  • ニシ ユキ シマシントウ ノ キュウソク ナ レイキャク 2 カンソク ケッカ

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Abstract

Possible underground heat sources and their cooling processes of the Nishinoshima-shinto are analized semi-quantitatively and discussed, based on the various thermal data summarized in our previous paper (Ehara et al. 1977). Rapid cooling of the Nishinoshima-shinto is interpreted as follows: The mass of the heat source which may exist in the underground at the present time is not greater than 1×1012g (or if the shape of the heat source is spherical, its radius does not exceed 50m). Furthermore, volcanic products empted not only below but also above the sea level are cooled by sea water. This is another main reason of the rapid cooling of the Nishinoshima-shinto. Of cource the underground heat source mentioned above is also being cooled by sea water at the present time. The rapid cooling of the Nishinoshima-shinto is caused mainly by the sea water around the island.

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