E. Kokinou* and A. Vafidis*
*Applied Geophysics Lab., Dep. Of Mineral Resources,
Eng. Technical Univ. of Crete, Chania, GREECE 73100.
E-mails: ekokinou@mred.tuc.gr;
vafidis@mred.tuc.gr
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.