Late Quaternary paleoseismic sedimentary record in deep central Gulf of Corinth: time distribution of inferred earthquake-induced layers

C. Campos (1) , C. Beck (2) , C. Crouzet (2) , E. Carrillo (3) , A. van Welden (4) , Efthymios Tripsanas (5)

1 USB - Universidad Simon Bolivar
2 ISTerre - Institut des Sciences de la Terre
3 Universidad Central de Venezuela, Instituto de Ciencias de la Tierra, Caracas,
4 Fugro Survey AS, Skøyen, Oslo, Norway
5 Institut of Oceanography

A sedimentary archive corresponding to the last 17 cal kyr BP has been studied by means of a giant piston core retrieved on board R/V MARION-DUFRESNE in the North Central Gulf of Corinth. Based on previous methodological improvements, grain-size distribution and Magnetic Susceptibility Anisotropy (MSA) have been analysed in order to detect earthquake-induced deposits. We indentified 36 specific layers -Homogenites+Turbidites (HmTu) - intercalated within continuous hemipelagictype sediments (biogenic or bio-induced fraction and fine-grained siliciclastic fraction). The whole succession is divided into a non-marine lower half and a marine upper half. The “events” are distributed through the entire core and they are composed of two terms: a coarse-grained lower term and an upper homogeneous fine-grained term, sharply separated. Their average time recurrence interval could be estimated for the entire MD01-2477 core. The non-marine and the marine sections yielded close estimated values for event recurrence times of around 400 yrs to 500 yrs.

Mots clés: Anisotropy of Magnetic Susceptibility; Paleoseismicity; Homogenite; Corinth

Domaines: Sciences de la Terre

C. Campos, C. Beck, C. Crouzet, E. Carrillo, A. van Welden, et al.. Late Quaternary paleoseismic sedimentary record in deep central Gulf of Corinth: time distribution of inferred earthquake-induced layers. Annals of Geophysics, 2013, 56 (6), pp.S0670. ⟨10.4401/ag-6226⟩. ⟨hal-01194189⟩