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Contribution of a new active faults map and sedimentary cores to the characterization of seismogenic sources in an interdisciplinary approach (Western Gulf of Corinth, Greece)
Beckers, Arnaud; Hubert, Aurelia; Beck, Christian et al.
2014EGU general assembly 2014
 

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Keywords :
Turbidite
Abstract :
[en] The Corinth rift is one of the fastest spreading rifts on Earth. 5 earthquakes of magnitude greater than 5.8 occurred during the last 40 years. 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 and mud flows) 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
Hubert, Aurelia  ;  Université de Liège - ULiège > Département de géographie > Géomorphologie
Beck, Christian
Tripsanas, Efthymios
Reyss, Jean-Louis
Albini, Paola
Rovida, Andrea
Scotti, Oona
De Batist, Marc
Sakellariou, Dimitris
Bernard, Pascal
Language :
English
Title :
Contribution of a new active faults map and sedimentary cores to the characterization of seismogenic sources in an interdisciplinary approach (Western Gulf of Corinth, Greece)
Publication date :
28 April 2014
Event name :
EGU general assembly 2014
Event organizer :
EGU
Event place :
Vienna, Austria
Event date :
du 27 avril 2014 au 2 mai 2014
By request :
Yes
Audience :
International
Available on ORBi :
since 04 May 2014

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