HR: 1330h
AN: T22A-0487    [PDF]
TI: A High Resolution Geophysical Study of the Offshore Western Gulf of Corinth Rift
AU: * McNeill, L
EM: lcmn@soc.soton.ac.uk
AF: Southampton Oceanography Centre, University of Southampton, Southampton, SO14 3ZH United Kingdom
AU: Cotterill, C
EM: cjc3@soc.soton.ac.uk
AF: Southampton Oceanography Centre, University of Southampton, Southampton, SO14 3ZH United Kingdom
AU: Stefatos, A
EM: A.Stefatos@upatras.gr
AF: Laboratory of Marine Geology and Physical Oceanography, University of Patras, Patras, 26500 Greece
AU: Henstock, T
EM: then@soc.soton.ac.uk
AF: Southampton Oceanography Centre, University of Southampton, Southampton, SO14 3ZH United Kingdom
AU: Bull, J
EM: bull@soc.soton.ac.uk
AF: Southampton Oceanography Centre, University of Southampton, Southampton, SO14 3ZH United Kingdom
AU: Collier, R
EM: richard@earth.leeds.ac.uk
AF: School of Earth Sciences, University of Leeds, Leeds, LS2 9JT United Kingdom
AU: Papatheodorou, G
EM: A.Stefatos@upatras.gr
AF: Laboratory of Marine Geology and Physical Oceanography, University of Patras, Patras, 26500 Greece
AU: Georgiopoulou, A
EM: ag1000@soc.soton.ac.uk
AF: Southampton Oceanography Centre, University of Southampton, Southampton, SO14 3ZH United Kingdom
AU: Ferentinos, G
EM: gferen@upatras.gr
AF: Laboratory of Marine Geology and Physical Oceanography, University of Patras, Patras, 26500 Greece
AB: The western Gulf of Corinth has generated recent debate in terms of distribution of extensional strain, interactions between active faults and fault geometry. Onshore data suggest that faults do not accommodate extensional strain of the magnitude suggested by geodetic measurements. Recently acquired high resolution geophysical data in the western Gulf of Corinth, including Reson Seabat 8160 50 kHz multibeam bathymetry (with sidescan collected simultaneously) and sparker and boomer seismic profiles, will allow a detailed study of faulting relationships, fault propagation history and associated sedimentological processes. Multibeam data indicate the complex axial and tributary channel pattern of the gulf as well as revealing the surface expression of active faults on both margins and within the basin centre. Several fault tips are evident, including the Aigion fault which has been surveyed in great detail with boomer lines spaced between 25-100 m. The fault tip is complex with multiple synthetic and antithetic splays. The post-lowstand transgressive surface is clearly imaged and therefore fault growth rates can be established. Gas-related features are common, including pockmarks and mud volcanoes. To the east, displacement on the eastern tip of the Eliki fault decreases rapidly offshore and a splay of the Derveni fault is observed. A major S-dipping antithetic fault opposite the Eastern Eliki fault has clear bathymetric expression and is locally associated with a prominent basement ridge. This fault may make a significant contribution to extensional strain in this part of the rift. In the centre of the basin, sediments are deformed by multiple minor faults with seafloor displacement. Ultimately, high resolution offshore interpretations can be integrated with regional datasets and existing data (e.g., geomorphic, paleoseismological and sedimentological) onshore and used to better assess rift deformation models, rift evolution and local seismic hazards.
DE: 3025 Marine seismics (0935)
DE: 3045 Seafloor morphology and bottom photography
DE: 7223 Seismic hazard assessment and prediction
DE: 8010 Fractures and faults
DE: 8109 Continental tectonics--extensional (0905)
SC: Tectonophysics [T]
MN: 2003 Fall Meeting