Tez özetleri Astronomi ve Uzay Bilimleri Anabilim Dalı

Interpretation Of Seismic And Microbathymetric Data Collected Beetween The İstanbul Strait And Prince Islands

North Anatolian Fault Zone (NAFZ), shows itself clearly onshore to the east of the Marmara Sea. Its extension in the Sea of Marmara, however, is still controversial. Several studies has been carried out to reveal the tectonic properties of this area following the Marmara earthquake in 17^th August, 1999.

In this study, a centrally located area on the Northern Shelf of Marmara Sea, especially the area between the southern exit of Istanbul Strait and the Prince Islands was investigated.

This study was based on the evaluation and interpretation of the seismic and multi-beam echosounder (microbathymetric) data.

The bathymetric data collected between 2003-2004 and the seismic data gathered in 1999 by the Turkish Navy, Department of Navigation, Hydrography and Oceanography along the southern exit of Istanbul Strait has, first, been evaluated and interpreted. Then, the seismic profiles shot in 2004 and 2005 has been incorporated to the existing data base. The lineaments and the other structural features detected on the bathymetric map were correlated with the seismic profiles. Stratigraphical interpretations of the seismic profiles based on the seismic reflection configurations and the unconformities yielded the presence of two stratigraphical units in the area; the Lower Unit and Upper Unit. The lower unit was termed the basement and the upper unit was called the basin fill. Paleotopography and sediment thickness maps of the upper unit were then prepared by calculating the depth and thickness of this unit in all the seismic profiles. These maps contain many significant tectonic entities which helped in the interpretation process.

The faults present in the study area and their characteristics were thus determined by evaluating the palaeo-topography, sediment thickness, bathymetry maps and the seismic profiles.

For the purpose of a more detailed investigation of the study area at a larger context, the data collected from the area between the Prince islands and the Gulf of Tuzla were also incorporated to this study. As a result, presence of a basin was found between the Gulf of Tuzla and the canyon of Istanbul Strait. This basin was thought to be the basin estimated to have developed between the clockwise rotating Kocaeli Peninsula (Oktay, 2002) and the NAFZ. Moreover, it is also possible to state that the normal faults, found in this study strike N-S and control the western slopes of the Istanbul Strait canyon. The normal faults around the vicinity of the Prince Islands strike NE-SW. The strike of the strike slip faults througout the study area, on the other hand, is found to be NW-SE, a direction also supported by the lineaments in the study area.

KORKMAZ Burcu ,

Danışman : Yrd.Doç.Dr. Ferhat ÖZÇEP

Anabilim Dalı : Jeofizik Mühendisliği

Programı (Varsa) :

Mezuniyet Yılı : 2007

Tez Savunma Jürisi : Yrd.Doç.Dr.Ferhat ÖZÇEP (Danışman)

Prof.Dr.Yıldız ALTINOK

Prof.Dr. Niyazi BAYDEMİR

Prof.Dr.Zuhal DÜZGİT

Yrd.Doç.Dr.İ.Halil ZARİF