Submerged notches and doline sediments as evidence for Holocene subsidence |
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Authors: | N. Evelpidou P.A. Pirazzoli |
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Affiliation: | a Faculty of Geology and Geoenvironment, National and Kapodistrian University of Athens, Panepistimiopolis, Zografou, 15784 Athens, Greece b CNRS-Laboratoire de Géographie Physique, 1 Place Aristide Briand, 92195 Meudon cedex, France c CNRS-UMR 7209. Archéozoologie, Archéobotanique : Sociétés, Pratiques et Environnements. 55, rue Buffon Paris, France d GeoEnvironmental Institute, Naxou 2-4, Doukissis Plakentias, Chalandri, 15238 Athens, Greece |
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Abstract: | The possibility of Holocene subsidence along the northern coast of the Corinth Gulf is often mentioned in the literature; however, systematic detailed evidence that submergence (e.g. of archaeological remains) does not simply depend from eustatic sea-level rise is most often missing. In this paper, a new detailed study of submerged tidal-notch profiles along the limestone coast has shown that periods of sea-level stability are intercalated with periods of rapid subsidence or gradual relative sea-level rise. It appears that most of the sites considered, seem to have been affected by a relatively recent co-seismic subsidence of about half a meter, whereas during the longer period, by stages of relative sea-level stability and/or gradual relative sea-level rise. This evidence of subsidence is confirmed by radiocarbon dating in doline sediments, suggesting that during certain periods, a relative sea-level rise was much faster than the raising suggested by glacio-eustatic or hydro-isostatic estimations. Juxtaposing a list of known earthquakes occurred in the area shows that several earthquakes (e.g. the 1981 one for the easternmost sites considered) are potential candidates for the recent co-seismic displacements and thus supporting the geomorphological interpretations. |
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Keywords: | Submergence Tidal notch Doline Bioerosion Earthquake Co-seismic displacement Corinth Gulf |
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