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Poster (Scientific congresses and symposiums)
Earthquake imprints on 400 years of marine sedimentation in the western Gulf of Corinth, Greece
Beckers, Arnaud; Hubert, Aurelia; Beck, Christian et al.
2014International Sedimentological Congres
 

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Keywords :
Sismo-turbidite
Abstract :
[en] The Corinth rift is one of the fastest spreading rifts on Earth. In the western tip of the Rift, no major historical earthquake (Mw≥6) is known for the last 300 yrs, while the geodetic extension rate is the highest of the whole Corinth Rift. The question of seismic hazard is consequently particularly relevant. In this framework, we investigated the offshore sediments in order to look for sedimentary signature of past earthquakes. 12 short gravity cores have been retrieved in different environments: two shelves (40 and 100 m deep), one sub-basin (180 m deep) and the deep Gulf axis (330 m deep). The cores are 0.5 to 0.85 m long, permitting to analyze up to 400 yrs of sedimentation. Several sedimentological analyses have been performed: magnetic susceptibility, grain-size, XRF, ASM. Chronology is based on 137Cs and 210Pb decay. In parallel, an in-depth analysis of existing and newly found documents has been done to re-interpret macroseismic intensity fields of historical earthquakes and to build an updated earthquake catalogue for the area. These new data allowed us to estimate a macroseismic intensity threshold for submarine slope failures in the area, based on 16 reported events. Sedimentary events have been identified in all cores. On the first shelf, despite a visually homogenous, silty, sedimentation, 3 events have been highlighted by high resolution grain-size analysis and 210Pb decay profile’s disturbances. The upper one could be a back-wash flow tsunami deposit. On the second shelf, 4 high-concentration density flow deposits occurred with a recurrence time of ~58 yrs. In the canyon and in the sub-basin, sandy turbidites occurred with recurrence times of ~26 and ~56 years respectively. The possible seismic origin of these deposits is discussed based on their sedimentary characteristics and the macroseismic intensities assessed for the sediments source areas for each core location.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Beckers, Arnaud ;  Université de Liège - ULiège > Département de géographie > Géomorphologie et Géologie du Quaternaire
Hubert, Aurelia  ;  Université de Liège - ULiège > Département de géographie > Géomorphologie et Géologie du Quaternaire
Beck, Christian
Tripsanas, Efthymios
Reyss, Jean-Louis
Albini, Paola
Rovida, Andrea
Scotti, Oona
De Batist, Marc
Sakellariou, Dimitris
Bernard, Pascal
Language :
English
Title :
Earthquake imprints on 400 years of marine sedimentation in the western Gulf of Corinth, Greece
Publication date :
18 August 2014
Number of pages :
A0
Event name :
International Sedimentological Congres
Event organizer :
International Association of Sedimentologists
Event place :
Geneva, Switzerland
Event date :
Du 18 au 22 août 2014
Audience :
International
Commentary :
Feel free to ask the pdf by e-mail to abeckers(at)ulg.ac.be
Available on ORBi :
since 26 August 2014

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