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Poster (Scientific congresses and symposiums)
Spatiotemporal distribution of last 500 yrs turbidites in the Western Gulf of Corinth, Greece: implications for the characterization of historical earthquakes
Beckers, Arnaud; Hubert, Aurelia; Beck, Christian et al.
201417th Joint Geomorphological Meeting
 

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Abstract :
[en] The Corinth rift is one of the fastest spreading rifts on Earth. 10 earthquakes of magnitude greater than 6 occurred during the last century. The question of seismic hazard is consequently particularly relevant. Despite a long earthquake catalogue, estimations of earthquake hazard remain problematic because of the difficulty to associate each historical event to one of the many active faults mapped in the area. Consequently, combining seismology, history and paleoseismology in an interdisciplinary approach is here necessary and is the goal of the ANR-SISCOR project. In this framework, we investigated the offshore sediments in order to (1) better constraint the length of the active offshore faults, and (2) look for sedimentary signature of historical earthquakes. 600 km of high resolution seismic reflexion data have been acquired during two surveys and 12 short gravity cores have been retrieved. The latters are 0.5 to 1 m long, allowing us to analyze about 500 yrs of sedimentation. Two new faults potentially able to trigger M>5.5 earthquakes have been mapped in the northern part of the gulf based on seismic data. Sedimentary events (turbidites sensu lato) have been identified in some cores, essentially in the deep basin and in a 180m-deep sub-basin close to the northern coast. The comparison with the critically reviewed historical records shows that some of these events could have been triggered by historical earthquakes. The link between these potential earthquakes sedimentary signatures, historical events and active faults is discussed based on intensity maps and our new active fault map.
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, Paoloa
Rovida, Andrea
Scotti, Oona
De Batist, Marc
Sakellariou, Dimitris
Bernard, Pascal
Language :
English
Title :
Spatiotemporal distribution of last 500 yrs turbidites in the Western Gulf of Corinth, Greece: implications for the characterization of historical earthquakes
Publication date :
01 July 2014
Number of pages :
A0
Event name :
17th Joint Geomorphological Meeting
Event organizer :
Unité de Géographie physique, département de Géographie, ULg
Event place :
Liège, Belgium
Event date :
du 30 juin au 3 juillet 2014
Audience :
International
Available on ORBi :
since 06 August 2014

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