کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4718605 1639130 2011 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
New insights of tsunami hazard from the 2011 Tohoku-oki event
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
New insights of tsunami hazard from the 2011 Tohoku-oki event
چکیده انگلیسی

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 Jōgan 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.


► The first results of a geological survey following the 2011 Tohoku-oki tsunami.
► The tsunami inundated and left sediment deposits up to 4.5 km inland.
► 62% of the inundation distance was covered with sand.
► The 869 AD Jōgan earthquake and tsunami have probably been underestimated.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Marine Geology - Volume 290, Issues 1–4, 1 December 2011, Pages 46–50
نویسندگان
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