The sedimentary record of the 1960 tsunami in two coastal lakes on Isla de Chiloe, south central Chile

SEDIMENTARY GEOLOGY

dc.creatorKempf, Philipp
dc.creatorMoernaut, Jasper
dc.creatorVan Daele, Maarten
dc.creatorVermassen, F
dc.creatorVandoorne, W
dc.creatorPino, Mario
dc.creatorUrrutia, R
dc.creatorSchmidt, S
dc.creatorGarrett, Ed
dc.creatorDe Batist, M
dc.date2021-08-23T22:59:48Z
dc.date2022-07-07T14:57:07Z
dc.date2021-08-23T22:59:48Z
dc.date2022-07-07T14:57:07Z
dc.date2015
dc.date.accessioned2023-08-22T10:56:21Z
dc.date.available2023-08-22T10:56:21Z
dc.identifier1150321
dc.identifier1150321
dc.identifierhttps://hdl.handle.net/10533/252681
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8341971
dc.descriptionThis study describes sediments deposited by the tsunami following the 1960 Great Chilean Earthquake (M-W 9.5) in two coastal lakes, Lakes Cucao and Huelde, on the west coast of Isla de Chiloe, south central Chile (42.6 degrees S). Sub-bottom profiles and side scan sonar mosaics illustrate the sedimentary context of transects of gravity cores. The stratigraphy of both lakes features gyttja sedimentation, interrupted by the abrupt emplacement of a sandy layer with mud rip-up clasts and a mud cap. This sandy layer reflects a sudden change in sedimentary environment, most probably caused by a high-energy inundation. Radionuclide analyses (Cs-137 and Pb-210) date the inundation deposit to shortly before the mid 1960s. The only known event that matches the sedimentological and chronological criteria is the AD 1960 tsunami. Using grain size analysis and comparisons with samples from modern environments, we demonstrate that the proximal (seaward) part of the deposit consists of a mixture of sand derived from subaerial sources and reworked gyttja lake sediment. In the distal (landward) part of Lake Cucao, the sand component is lost and the deposit consists entirely of remobilised lake sediments. The repetition of tsunami deposit sequences in Lake Huelde suggests a minimum of three inundating waves. Sub-bottom profiles and side scan sonar mosaics reveal tsunami inundation over the barrier and more prominently through the outlet river channel. The dominant role of the river channel as a pathway for sediment transport is also described in core samples by tsunami deposits that fine away from the channel mouth. The identification and description of the deposit left by a known tsunami provide important insights into tsunami sedimentation in coastal lakes and have the potential to help in the search for paleotsunami evidence. (C) 2015 Elsevier B.V. All rights reserved.
dc.descriptionRegular 2015
dc.descriptionFONDECYT
dc.descriptionFONDECYT
dc.languageeng
dc.relationhandle/10533/111557
dc.relationhandle/10533/111541
dc.relationhandle/10533/108045
dc.relationhttps://doi.org/10.1016/j.sedgeo.2015.08.004
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 Chile
dc.rightshttp://creativecommons.org/licenses/by-nc-nd/3.0/cl/
dc.rightsinfo:eu-repo/semantics/article
dc.rightsinfo:eu-repo/semantics/openAccess
dc.titleThe sedimentary record of the 1960 tsunami in two coastal lakes on Isla de Chiloe, south central Chile
dc.titleSEDIMENTARY GEOLOGY
dc.typeArticulo
dc.typeinfo:eu-repo/semantics/publishedVersion


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