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"Abstract" refers to sandy tsunami deposits that do not reflect the true extent of tsunami inundation areas, contributing to underestimates of inundation by past tsunamis and, in turn, the magnitudes of tsunami-related tsunamis. " The 2011 tsunami deposit was discovered to be a landward-thinning interbedded sand and soil layer that became ambiguous in landward locations, according to Stratigraphic results. Concentrations of peak isolongifolene were also present in landward soils devastated by the tsunami, in which no sand layer was visible, but no flood level was observed beyond the inundation threshold. ".
Source link: https://doi.org/10.1186/s40645-022-00491-6
"Abstract The 2011 Tohoku-oki tsunami left a distinctive geochemical signature in the sediments of the Misawa harbor off the coast of Aomori, not only in vertical stratigraphy but also in lateral distribution. " To determine and characterize geochemical patterns within the harbor area, appropriate indicator compounds for the tsunami impact were used. Dichlorodiphenyltrichloroethane and its precursors, or polychlorinated biphenyl indicate erosion and rearrangement of contaminants present in the sediments prior to the tsunami. Old burden markers are characterized by erosion of contaminated pre-tsunami sand erosion, fluid reamination, and subsequent deposition of these sediment-bound pollutants in the tsunami layer, in comparison to newly introduced pollutants. "source-specific compounds show different emission sources according to their intended accumulation by all pollutant groups, but also show a topographical map of the pollutant distribution by the 2011 tsunami. ".
Source link: https://doi.org/10.1007/s11069-022-05391-y
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