Paleotsunami history of Hachinohe, northern Japan: a multiproxy analysis and numerical modeling approach
نویسندگان
چکیده
Abstract Paleotsunami studies along the Pacific coast of Tohoku, northern Japan, have been considerably developed recently, particularly after massive impact 2011 Tohoku-oki tsunami. Nevertheless, in southernmost Shimokita Peninsula, pertaining to paleotsunami are underdeveloped, leading a vague understanding tsunamigenic sources northward Tohoku region, with incomplete hazard evaluation. deposits can be related not only Japan Trench Sanriku but also Kuril trench Hokkaido. In this study, we unveiled history Hachinohe Tohoku. Using combination sedimentological, geochemical, paleontological, and mineralogical proxies, characterized seven sand layers that dated from ca. 2700 5500 yr BP based on radiocarbon ( 14 C) ages as event marine origin. Sedimentological paleontological evidence coupled ground-penetrating radar imagery revealed marsh environment comprising successive extinct ponds, controlling depositional environment. Numerical modeling ruled out possibility storms genetic sources, conclusion presence sediments study area would associated tsunami inundation episodes. Based C dating, mean frequency recurrence tsunamis is estimated 384 years (320–450 yr, 95% confidence interval) coefficient variation 0.78 (0.68–0.99, interval). The previously recorded limited absence an interval Peninsula reaffirm importance record site for activity both trenches.
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ژورنال
عنوان ژورنال: Progress in Earth and Planetary Science
سال: 2022
ISSN: ['2197-4284']
DOI: https://doi.org/10.1186/s40645-022-00477-4