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Επεξεργασία των πρωτογενών δεδομένων σεισμικής ανάκλασης από τη θαλάσσια περιοχή του Νοτίου Αιγαίου με τη μέθοδο της σεισμικής χωροθέτησης

Gialitaki Maria

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Summary

The topic of the hereof MSc. thesis is the seismic-reflection raw data processing with various seismic-migration methods, such as Kirchhoff Migration and Finite-Difference Migration.Data from a part of the existing AEG-1 seismic line, located in the marine area of the South Aegean, was selected for this processing. The processing of the seismic data was realized in a Seismic Processing and Imaging Software by Paradigm (Paradigm® 14.1) in the Laboratory of Applied Geophysics of the Technical University of Crete.Prior to the seismic-migration application, trace-processing methods such as band-limited noise suppression, velocity analysis, gain (spherical divergence correction), slant-stack domain multiple suppression, zero-phase deconvolution, Normal Moveout (NMO) correction and stacking were used. Next, the parameters of Kirchhoff and finite-difference migration (f-x) were studied. Finally, the migrated sections were compared.The purpose of the above processing is the depiction of the geological subsurface structure of the aforementioned marine area. Taking the migrated section into account, it can be concluded that the subsurface in this particular area consists of a) the basic sequence which is composed of high-pressure/low-temperature metamorphic carbonate rocks (marbles) of the Upper Triassic - Lower Jurassic overcovered with high-pressure/low-temperature metamorphic meta-flysch of the Tertiary, b) the glaucophane series which lies as nappe on the basic autochthonous sequence of marbles and is comprised of glaucophane schists, metabasites, meta-volcano-sedimentary rocks, metapelites and Palaeozoic gneisses, c) the upper tectonic sequence which is placed as nappe on the second lower sequence and consists of volcaniclastic rocks of the Permian - Triassic, carbonate rocks of the Upper Triassic - Jurassic, residues of ophiolitic rocks with limestones of the Upper Cretaceous, gneiss and amphibolite substratum rocks, d) sedimentary rocks of the Neogene, e) sediments of the Quaternary and f) recent sediments deposited in a quiet depositional environment.

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