Sedimentation particularities during the tsunami of December 26, 2004, in northern Indonesia: Simelue Island and the Medan coast of Sumatra Island |
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| Authors: | N G Razzhigaeva L A Ganzei T A Grebennikova E D Ivanova V M Kaistrenko |
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| Institution: | (1) Pacific Institute of Geography, Far East Division, Russian Academy of Sciences, Vladivostok, Russia;(2) Institute of Marine Geology and Geophysics, Far East Division, Russian Academy of Sciences, Yuzhno-Sakhalinsk, Russia |
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| Abstract: | Sediments deposited during the tsunami of December 26, 2004, in coastal areas that differ in their structure and orientation relative to the tsunami front are studied with defining of the factors controlling particular features of the sedimentation under different wave intensities. The lithology of tsunami-related deposits and data on various fossils (diatoms, foraminifers, and mollusks) are analyzed. It is established that the tsunami resulted in the accumulation of sediments of various composition, which is explained by the features of the transformation of the wave as well as by the structure of the underwater coastal slope, the flooded zone, and the provenance. Variably oriented coseismic motions are one of the factors influencing the sedimentation patterns. The paleotsunami deposits discovered are compared with their recent counterparts. |
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