LAVA FLOWS AT SAKURAJIMA VOLCANO (I)-VOLUME OF THE HISTORICAL LAVA FLOWS-

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  • 桜島火山の溶岩流 (1) -有史時代の溶岩流の容積-
  • サクラジマ カザン ノ ヨウガンリュウ 1 ユウシ ジダイ ノ ヨウガンリュウ

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Abstract

The thickness and the volumes of the recent two lava flows (in 1914 and 1946) at SakurajimaVolcano are reexamined in details on the basis of the three topographic maps (published in 1909, 1920 and 1965) and two hydrographic charts (published in 1899 and 1975). Furthermore, thetopographic feautures of the 1914 submarine lava-field has been clarified by echo-sounding. Thevolume of the 1914 lava flows and that of the 1946 lava flows have been estimated to be 1.34 km3 and0.18 km3, respectively. Omori (1914) and Koto (1916) estimated the volume of the 1914 lavaflows to be 1.56 km3 and 1.14 km3, respectively. Judging from the results of echo-sounding on thesubmarine lava-field, it is concluded that Omori overestimated the mean thickness of the lava flowsand Koto, on the contrary, estimated it too little.The volumes of the two historical lava flows are also estimated, assuming the position of thetopographic contours on the lava-fields before the eruptions under the condition that the volcano isa stratovolcano. The values of 0.5 km3 and 1.7 km3 have been obtained, as the first approximation, about the Bun'mei lava flows (1471-76) and the An'ei lava flows (1779), respectively.

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