Application d'un délai en tempsàtempsà la source de 51.2 ms ,
nous considérons le champ de Oseberg comme un milieu simple localement complexe, Même si le champ de vitesse est globalement 1D, nous savons que la partie 16.2. DONNÉESDONN´DONNÉES HYDRATECH 203 ,
nous n'avons pas essayé de les atténuer. La qualité de la section est altérée par la présence de nombreux pics dans les traces ,
Une caractéristique du BSR dans cette région est la présence d'un double BSR, 2003. ,
Ce second BSR décrit par correspond selon ces auteursàauteursà un BSR fossile, qui correspondraitàdraità la base de la zone de stabilité des hydrates avant unsouì evement très récent (moins de 10 000 ans) ou un changement de la circulation océanique. Les images 3D de [Martin, 2003] ont permis d'´ etendre son extension connue dans le Pliocène, Kodaiba, 2002. ,
un seul BSR (tiret orange de la zone 2 sur la figure 16.36) clairement identifiable. Ce BSR estparalì ele et de signe opposé au fond de l'eaù a une distance horizontale comprise entre 20 et 30 kilomètres. Il est bien visible sous le haut de la pente, puis dispara??tdispara??t en bas de celle-ci ,
36 ? Position du BSR (tiret orange) dans la zone 2. Position de l'´ evénementevénementà forte amplitude, nonparalì ele et de même signe que le fond de l'eau (tiret-point vert) dans la zone ,
le squelette permet de contraindre la simulation de manì ere structurale mais aussi via les attributs AVA (intercept, gradient) et les résultats de la migration (pendage, section sommée ,
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