黑色海啸带来的粉质物质在淹没面积估算中的适用性

Kousuke Nakamura, T. Komai
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引用次数: 0

摘要

根据历史资料,海啸据说是经常发生的。以地层中的砂质物质为线索,在地层中寻找海啸沉积物,估算了古海啸淹没面积。然而,2011年东北地震的黑流在发现沙质物质的区域之外留下了粉砂状的黑色海啸沉积物。预计粉质物质作为附加线索将提高淹没面积估算的准确性。对2011年东北海啸期间海啸沉积的形成进行了数值模拟。在仙台平原获得了土壤岩心样品,发现了公元869年约干海啸的粉质黑色海啸沉积物。在2011年东北海啸模拟结果中,粉质物质达到淹没区前缘与海岸线之间90%的距离。在2011年东北地震淹没区内的18个土芯样品中均发现了869年约干海啸的粉质黑色海啸沉积物。在模拟结果中,18个采样点中有15个发现了粉质物质。黑色海啸沉积物含有丰富的粉质物质,可以作为估计古海啸淹没面积的另一条线索。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Applicability of silty material brought by black tsunami to estimation of inundation area
Tsunami is said to be recurrent according to historical sources. Estimation of inundation area of paleotsunamis have been done by finding tsunami deposit in stratum by using sandy material in it as a clue. However, Black stream of 2011 Tohoku Earthquake left silty black tsunami deposit beyond the area where sandy material is found. It was expected that silty material as additional clue will bring better accuracy to estimation of inundation area. Formation of tsunami deposit during 2011 Tohoku Tsunami was numerically simulated. Soil core samples were obtained at Sendai Plain to find silty black tsunami deposit of AD 869 Jogan Tsunami. Silty material reached 90% of distance between the front edge of inundation area and the shorelines in the simulation result of 2011 Tohoku Tsunami. Silty black tsunami deposit of AD 869 Jogan Tsunami was found from all 18 soil core samples within inundation area of 2011 Tohoku Earthquake. Silty material was found in the simulation result at 15 out of 18 sampling points. Black tsunami deposit which contains rich amount of silty material can be another clue to estimate inundation area of paleotsunamis.
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