The 1741 Oshima‐Oshima Eruption: Extent and volume of submarine debris avalanche
The 1741 Oshima‐Oshima Eruption: Extent and volume of submarine debris avalanche
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1741 年大岛-大岛火山喷发：海底碎片雪崩的范围和数量
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
Y. Kato
中科院分区：
文献类型：
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作者：
K. Satake;Y. Kato
大岛（Oshima‐Oshima）是位于日本海北海道西南方的一座火山岛。1741年8月29日的猛烈喷发造成了北侧的一个扇形坍塌。还记录了造成2000人伤亡的极具破坏性的海啸，但其生成机制一直存在争议;空中区域塌陷的体积约为0.4 km³，被认为太小，不足以产生如此毁灭性的海啸。我们编译和分析最近获得的条带测深数据在岛上。该火山距离海底超过2.3公里，其底部直径为18公里。陆上和海底的总滑动体积估计为2.4 km³，比陆上部分大近一个数量级。在岛的北部，有一个69 km²的碎石堆积的丘状地形，总体积为2.5 km³，与总滑坡体积相似。这是历史上最大的碎片雪崩之一，可能是海啸产生的原因。
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.