Submarine geo-hazards on the eastern Sardinia-Corsica continental margin based on preliminary pipeline route investigati
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ORIGINAL RESEARCH PAPER
Submarine geo-hazards on the eastern Sardinia-Corsica continental margin based on preliminary pipeline route investigation S. Cecchini • D. Taliana • L. Giacomini C. Herisson • B. Bonnemaire
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Received: 30 March 2010 / Accepted: 21 March 2011 / Published online: 8 April 2011 Springer Science+Business Media B.V. 2011
Abstract The understanding of the morphology and the shallow geo-hazards of the seafloor is a major focus for both academic and private industry research. On November and December 2009 a geophysical pipeline survey was carried out by Fugro Oceansismica S.p.A. (FOSPA) and FUGRO France (FFSA) for DORIS Engineering on behalf of GRTgaz (Engineering centre, Transmission Pipe Department; www.grtgaz.com) which are currently investigating the possibility of laying a pipeline between Sardinia and Corsica as a spur line from the planned GALSI Project. The Project, ‘‘Alimentation de la Corse en gaz naturel’’, consists of a corridor 100 km long and 1.0 km wide along the CorsicaSardinia shelf. The integration of the multibeam, sidescan sonar and sparker data provided a high resolution seafloor mapping for geo-hazard assessment. In this article the data
acquired along a break of slope section (approximately 20 km 9 1.5 km), in the eastern sector of the Strait of Bonifacio are described. The area was abandoned during the survey, because of its unsuitability. Indeed, in this area the continental shelf, approximately 100 m deep and deepening gently eastward, is characterized by an uneven morphology, with different seabed features such as Beach-rocks mainly NNW-SSE oriented. Also, the continuity of the continental margin, identified around -110/-115 m, is interrupted by four canyon heads which incise the slope and are associated with glide deposits. Keywords Strait of Bonifacio Seafloor mapping Canyon Continental shelf Break of slope Glide deposits Introduction
S. Cecchini D. Taliana (&) L. Giacomini Fugro Oceansismica S.p.A. (FOSPA), Viale Charles Lenormant 268, 00126 Rome, Italy e-mail: [email protected] URL: www.fugro.com S. Cecchini e-mail: [email protected] L. Giacomini e-mail: [email protected] C. Herisson Fugro France (FFSA), 39, Rue des Peupliers, 92752 Nanterre Cedex, France e-mail: [email protected] URL: www.fugro.com B. Bonnemaire DORIS Engineering, 58A, Rue du Dessous des Berges, 75013 Paris, France e-mail: [email protected] URL: www.doris-engineering.com
In November and December 2009 Fugro Oceansismica S.p.A. (FOSPA) and Fugro France (FFSA) performed a geophysical survey for Doris Engineering on behalf of GRT Gaz in relation with the pipeline routing project ‘‘Alimentation de la Corse en gaz naturel’’. The survey area was a 100 km-long, 1 km-wide corridor between Northern Sardinia (Italy) and Southern Corsica (France) (Fig. 1), covering part of the continental slope. The scope of the work was to analyze the seafloor and shallow surface conditions in order to provide an assessment of potential geo-hazards that could affect the installation, stabi
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