A proposal for the source vent of the rishiri-wankonosawa tephra (rs-wn), the late pleistocene marker tephra in northern hokkaido

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概要

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• Rishiri-Wankonosawa tephra (Rs-Wn) is one of the late Pleistocene marker tephras in northern Hokkaido. This tephra was previously considered to have been supplied from the central part of Rishiri island volcano. Detailed mapping of thickness and grain-size of this tephra, however, shows that the source vent lies not on the island but at the crater-like depression submerged 90m below sea-level about 5.5km off the southeastern coast of the island. Radiocarbon age determinations and stratigraphical features of this tephra associated with distal marker tephra and periglacial phenomena indicate that the eruption took place during the maximum stage of the Last Glaciation. The lithofacies of this tephra with no phreatomagmatic component suggest that the eruption possibly occurred on land at the low stand of sea-level.

• 首都大学東京の論文

著者

• Miura Hideki

  東京都立大学

関連論文

• A proposal for the source vent of the rishiri-wankonosawa tephra (rs-wn), the late pleistocene marker tephra in northern hokkaido

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