%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Paris, R.
%A Pelletier, Bernard
%A Roger, J.
%A Wassmer, P.
%A Sabatier, P.
%T Sedimentary evidence of tsunamis in New Caledonia, southwest Pacific
%D 2023
%L fdi:010090259
%G ENG
%J Marine Geology
%@ 0025-3227
%K Tsunami deposits ; Paleotsunami ; New Caledonia ; Loyalty Islands ; Melanesia ; Pacific Islands
%K NOUVELLE CALEDONIE ; PACIFIQUE ILES
%M ISI:001071145500001
%P 107116 [19 ]
%R 10.1016/j.margeo.2023.107116
%U https://www.documentation.ird.fr/hor/fdi:010090259
%> https://www.documentation.ird.fr/intranet/publi/2023-11/010090259.pdf
%V 463
%W Horizon (IRD)
%X This study aims to identify tsunamis in the coastal sedimentary archives of New Caledonia (Grande Terre and the Loyalty Islands) in the southwest Pacific, to extend a relatively short historical tsunami record (150 years), and to bring more constraints on the frequency of the main tsunamigenic earthquakes in the region. Using a combination of sedimentary and geochemical approaches on sediment core samples, we document three types of deposits related to marine inundation: (1) bioclastic sand layers; (2) crypto-deposits with a marine chemical signature; and (3) accumulations of rounded pumice lapilli. Most of the sampling sites being located outside the morpho-dynamic impact zone of the cyclones, a tsunami origin is preferred. The spatial distribution of the deposits suggests tsunami runups exceeding 2.5 m a.s.l. on the northeastern coast of Grande Terre, 6 m on the eastern coast of Maré Island, and 10 m on the northeastern coast of Lifou Island. Finally, at least six tsunamis were preserved in the sedimentary record: one event soon after 1000 BCE, two events during the first millennium CE, and at least three events during the last millenium (including a 15th century tsunami, the 28 March 1875 tsunami, and a tsunami possibly related to the 1729 earthquake in Vanuatu).
%$ 064 ; 032