New insights of tsunami hazard from the 2011 Tohoku-oki event
New insights of tsunami hazard from the 2011 Tohoku-oki event
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DOI：
10.1016/j.margeo.2011.10.004
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发表时间：
2011-12-01
期刊：
影响因子：
2.9
通讯作者：
Yulianto, Eko
中科院分区：
文献类型：
--
作者：
Goto, Kazuhisa;Chague-Goff, Catherine;Yulianto, Eko
我们报告了我们最近实地调查的初步结果，记录了2011年日本仙台平原东北海啸的淹没和由此产生的沉积物。海啸淹没了内陆4.5公里，但0.5厘米厚的沙堆只延伸了2.8公里(淹没距离的62%)。然而，沉积物继续作为泥层，一直到淹没极限。泥沙沉积物含有高浓度的可溶出水氯，我们得出结论，地球化学标志和微化石数据可能被证明是有用的，以确定可能延伸到任何保存的砂层之外的古海洋的最大淹没极限。我们最近获得的关于2011年地震的数据表明，以前对该地区古太阳活动(例如公元869年乔根地震和海啸)的估计可能被低估了。如果2011年和公元869年的事件确实具有可比性，那么这些自然灾害在日本发生的风险比之前认识到的要大得多。(C)2011年爱思唯尔。版权所有。
We report initial results from our recent field survey documenting the inundation and resultant deposits of the 2011 Tohoku-oki tsunami from Sendai Plain, Japan. The tsunami inundated up to 4.5 km inland but the >0.5 cm-thick sand deposit extended only 2.8 km (62% of the inundation distance). The deposit however continued as a mud layer to the inundation limit. The mud deposit contained high concentrations of water-leachable chloride and we conclude that geochemical markers and microfossil data may prove to be useful in identifying the maximum inundation limit of paleotsunamis that could extend well beyond any preserved sand layer. Our newly acquired data on the 2011 event suggest that previous estimates of paleotsunamis (e.g. 869 AD Jogan earthquake and tsunami) in this area have probably been underestimated. If the 2011 and 869 AD events are indeed comparable, the risk from these natural hazards in Japan is much greater than previously recognized. (c) 2011 Elsevier By. All rights reserved.