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

• Published in: Annals of geophysics Vol. 56; no. 6
• Main Authors: Corina Campos, Christian Beck, Christian Crouzet, Eduardo Carrillo, Aurélien Van Welden, Efthymios Tripsanas
• Format: Journal Article
• Language: English
• Published: Istituto Nazionale di Geofisica e Vulcanologia (INGV) 01-01-2013
• Subjects: Anisotropy of Magnetic Susceptibility; Corinth; Homogenite; Paleoseismicity
• ISSN: 1593-5213; 2037-416X
• DOI: 10.4401/ag-6226

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.