GNGTS 2017 - 36° Convegno Nazionale

590 GNGTS 2017 S essione 3.1 Fig. 3 - Simplified model of the Gorringe Bank (upper panel): overpressured fluids are present along the faults (in light blue) and within the North Gorringe Chaotic Body (in yellow). CDP gathers of the fault zone (A) and the North Gorringe Avalanche zone (B) of BS14 profile: data migrated with HighVel (right panel) and HighVel70% velocity field (left panel). InA and B, it is clearly visible how structures such as faults and chaotic bodies are better imaged with a reduced velocity fields (HighVel70% values are reduced by 30% from the original velocity fields obtained with the standard velocity analysis), indicating sharp abrupt lateral velocity changes associated with overpressured fluids. References Banda E., M. Torné and I. A. M. Group; 1995: Iberia Atlantic Margin Group investigates deep structure of ocean margins . Eos Trans. AGU, 76 , 25-29 Baptista M.A., Heitor S., Miranda J.M., Miranda P.M.A. and Mendes Victor, L.; 1998: The 1755 Lisbon tsunami; evaluation of the tsunami parameters. J. Geodyn., 25 (1–2), 143–157. Hayes D. E., Pimm A. C., Beckmann J. P., Benson W. E., Berger, W. H., Roth, P. H., Supko P. R. and Rad, U.; 1972: Site 135 . In: Hayes D. E., Pimm A. C. et al. ; 1972. Site DSDP 135. Initial Reports of the Deep Sea Drilling Project, 14 , 15-48. Hayward N., Watts A.B., Westbrook G.K. and Collier J.S.; 1999: A seismic reflection and GLORIA study of compressional deformation in the Gorringe Bank region, eastern North Atlantic . Geophys. J. Int., 138 , 831– 850.