E. Kokinou* and A. Vafidis*
*Applied Geophysics Lab., Dep. Of Mineral Resources, Eng. Technical Univ. of Crete, Chania, GREECE 73100.
Abstract: Seismic modeling was performed in order to interpret the data from a seismic reflection survey conducted across the western margin of the Hellenic arc in Ionian sea. The synthetic seismograms were calculated utilizing the Finite difference method. The migrated seismic section along the surveyed seismic line showed complex geologic structures such as a diapiric flower structure near Kefallinia island. Velocity analysis was performed on the field data in order to obtain velocity models for the Kefallinia diapir and the sedimentary basin east of Kefallinia diapir. For the sedimentary basin, the root mean square (RMS) velocities of selected events for the real and synthetic data are in very good agreement. Major reflection events have been identified and are attributed to the top of Plio-Quaternary, Upper Miocene-Lower Pliocene and Middle-Miocene sediments. The synthetic seismograms for three shot gathers proved useful in recognizing the seismic events on the real data for the diapiric structure. The reflection from the top of the diapiric intrusion is present on both real and synthetic seismograms. The diapir, consisting of Triassic evaporites, intercepts the Plio-Quaternary and Upper Miocene-Lower Pliocene sedimentary layers.