The 1741 Oshima‐Oshima Eruption: Extent and volume of submarine debris avalanche

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書誌事項

公開日
2001-02
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2000gl012175
公開者
American Geophysical Union (AGU)

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説明

<jats:p>Oshima‐Oshima is a small volcanic island southwest off Hokkaido in Japan Sea. The violent eruption on August 29, 1741 caused a sector collapse of the north flank. Very destructive tsunami with 2000 casualties was also documented, but the generation mechanism has been controversial; volume of subaerial sector collapse, about 0.4 km³, was considered too small to generate such a devastating tsunami. We compile and analyze recently‐obtained swath bathymetry data around the island. The volcano is more than 2.3 km high from ocean bottom with its base diameter of 18 km. The total slide volume, both subaerial and submarine, is estimated as 2.4 km³, nearly an order of magnitude larger than the subaerial part. To the north of island, hummocky terrain of debris deposits extends in an area of 69 km² with the total volume of 2.5 km³, a value similar to the total slide volume. It is one of the largest debris avalanches in historic time, and probably responsible to the tsunami generation.</jats:p>

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