Abstract
Deposits of the two strongest tsunamis of the 20th century have been found on the eastern coast of Primorye. The tsunamis had epicenters in the Sea of Japan west of the coast of Hokkaido. The distribution and preservation of deposits in bays of different geomorphological structure have been analyzed. The best defined sedimentary covers occur in the upper part of sections in low-lying areas of bay shores, where the wave runup was more than 3 m. The best preserved deposits have been observed in bays attributed to loworder streams. Variations of the structural composition of tsunami deposits formed by traction processes associated with the tsunamis have been analyzed depending on distance from the shoreline; the sources of material have been identified. Tsunami waves transported sand not only from beaches, ancient storm ridges, and terraces, but also from the underwater coastal slope; waves also grabbed material from estuarine lagoons and lakes located in the shore inundation zone. Deposits include marine diatoms with dominant sublittoral planktonic and benthic species, which suggests that the material was transported from a depth no more than 15 m. Deep-sea species of diatoms and their fragments have been encountered. Among freshwater diatoms are species with different ecological identities, indicating erosion and redeposition of material transported from various sources.
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Original Russian Text © L.A. Ganzey, N.G. Razjigaeva, Yu. Nishimura, T.A. Grebennikova, A.O. Gorbunov, V.M. Kaistrenko, Yu.A. Naumov, I.I. Lebedev, 2017, published in Okeanologiya, 2017, Vol. 57, No. 4, pp. 628–640.
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Ganzey, L.A., Razjigaeva, N.G., Nishimura, Y. et al. Deposits of the 1983 and 1993 tsunamis on the coast of Primorye. Oceanology 57, 568–579 (2017). https://doi.org/10.1134/S0001437017040075
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DOI: https://doi.org/10.1134/S0001437017040075