Active tectonics of the Izmit Gulf (NE Marmara Sea): from high resolution seismic and multi-beam bathymetry data

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• 作者：Gokasan ; E. ; Alpar ; B. ; Gazioglu ; C. ; Yasar Yucel ; Z. ; Tok ; B. ; Dogan ; E. ; Guneysu ; C.
• 关键词：Shallow seismic ; Izmit Gulf ; North Anatolian Fault Zone ; Marmara Sea ; Active tectonics
• 刊名：Marine Geology
• 出版年：2001
• 出版时间：May 15, 2001
• 年：2001
• 卷：175
• 期：1-4
• 页码：273-288

文摘

Several active faults were determined in the Gulf of zmit, using high-resolution shallow seismic and multi-beam bathymetry data. One of them is a buried fault (Fault 2), following central axis of the gulf, which forms the current morphology within its releasing and restraining bends. Releasing bends control the current morphology of the sub-basins. Also restraining bends form folds in the central basin and a thrust in the western basin. A left step over between two strike-slip faults (Faults 2 and 11) creates a transpressional area. Therefore, Hersek and Çatal deltas are uplifted.

It is determined that Fault 2 could not be related to the origination of the gulf because it cuts all basins and ridges, thus, present geometry of the Fault 2 is not suitable for the initial formation of the gulf. From this point of view, the Fault 2 is initiated recently compared to the whole North Anatolian Fault Zone (NAFZ) in the Marmara Sea. Therefore, Fault 2 is recognised as a new rupture of the NAFZ probably active since the end of the last glacial ice period.