NDLI: Late quaternary seismic stratigraphy and active faults of the Gulf of İzmit (NE Marmara Sea)

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Late quaternary seismic stratigraphy and active faults of the Gulf of İzmit (NE Marmara Sea)

Content Provider	Springer Nature Link
Author	Okyar, Mahmut Pinar, Ali Tezcan, Devrim Kamaci, Züheyr
Copyright Year	2008
Abstract	The Upper Quaternary seismic stratigraphy and active faults of the Gulf of İzmit were investigated by means of high-resolution shallow seismic profiling data in the source region of 1999 İzmit earthquake. High-resolution seismic reflection data correlated with borehole data indicate that the stratigraphy of İzmit Bay consists of three distinct depositional sequences formed in response to middle Pleistocene-Holocene sea-level changes. Reflector R, separating the pre-Holocene sequences (1 and 2) from the Holocene sequence (3), represents an erosional unconformity produced by the subaerial fluvial erosion of the continental shelves at the time of the last glacial maximum. Occasional, anomalous reflections (acoustic turbidity) observed within the Holocene sequence are interpreted as gas accumulations. The maximum thickness of the Holocene sediments is found to be about 25 m. The isopach map of Holocene sediment implies that the thickness of the Holocene decreases from the east towards the central and western basins of İzmit Bay. Two distinct fault systems are interpreted in İzmit Bay. The main fault system extending roughly in an E-W direction along the Gulf of İzmit is an active right lateral strike slip fault with a normal component. The secondary faults are normal faults striking in different directions and these are identified as being both active and inactive. In addition, prominent compressive features are identified in the seismic cross-sections of some profiles acquired to the east of Hersek Peninsula where the focal mechanisms of the aftershocks of the 1999 İzmit earthquake also reveal predominantly reverse faulting mechanisms, as identified by a local dense seismic network.
Starting Page	89
Ending Page	107
Page Count	19
File Format	PDF
ISSN	00253235
Journal	Marine Geophysical Researches
Volume Number	29
Issue Number	2
e-ISSN	15730581
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-06-19
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Holocene Late-quaternary Shallow seismic Tectonics North Anatolian Fault İzmit Bay Offshore Engineering Geosciences Geophysics/Geodesy Oceanography
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics Oceanography

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