Abstract
<p>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.</p>
Highlights
Following different studies achieved in tectonically active areas, lake and restricted marine basins have demonstrated their potential for the sedimentary recording of seismic shocks [e.g. Hempton and Dewey 1983, Siegenthaler et al 1987, Van Loon et al 1995, Syvitski and Schafer 1996, Mörner 1996, Chapron et al 1999, Shiki et al 2000, De Batist et al 2002]
Recent works show the importance of the application of the Magnetic Susceptibility Anisotropy (MSA) in the study and identification of post-depositional disturbances related to earthquake triggering [Levi et al 2006, Mörner and Sun 2008]
Based on high resolution analyses of layering, composition, and, overall, textures, the sedimentary succession sampled through the MD01-2477 core is considered as a paleoseismic archive for the last 17 cal kyr BP, for the central part of the Gulf of Corinth
Summary
Following different studies achieved in tectonically active areas, lake and restricted marine basins have demonstrated their potential for the sedimentary recording of seismic shocks [e.g. Hempton and Dewey 1983, Siegenthaler et al 1987, Van Loon et al 1995, Syvitski and Schafer 1996, Mörner 1996, Chapron et al 1999, Shiki et al 2000, De Batist et al 2002]. Following different studies achieved in tectonically active areas, lake and restricted marine basins have demonstrated their potential for the sedimentary recording of seismic shocks [e.g. Mass wastings (triggered, or not, by seismic shocks) evolving into gravity flowing (density/turbidity currents) may provide large areas for spreading and produce “classical” turbidites (with the differents terms defined by Bouma [1962] or Mutti and Ricci Lucchi [1978]; Piper and Normark [2009]). When occurring in more confined (or restricted) basins (lakes or isolated marine basins) re-depositional processes may result into specific complex layers, due to reflections on steep slopes and/or to oscillations of the whole water mass (reflected tsunami, seiche effect). A significant seismo-tectonic activity is responsible for the second type of sedimentary “event”, the reason for which it is searched for paleoseismic purpose and contribution to seismic hazard estimation
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
