Full text loading...
-
Active tectonics and deformation patterns evidenced from new Chirp seismic data from Marmara Sea, Turkey
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 16th International Conference on Geoinformatics - Theoretical and Applied Aspects, May 2017, Volume 2017, p.1 - 5
Abstract
The northern branch of the North Anatolian Fault (NAF) zone is the most active tectonic element in the Marmara Sea and responsible for most of the seafloor and subsurface deformations observed along the northern shelf. Various of these deformations are determined by using Chirp data. In this context, Chirp seismic data were conducted in 2015. A total of 500 km Chirp data have been interpreted to reveal the structural features of the basement rocks covered with late Quaternary sediments along the northern shelf. The sediment thickness of the thin overlying seismic unit (U2) increases close the coastline and beyond the shelf break. The lower unit (U1) gradually thins in the middle of the shelf and towards the shelf break in the study area; mostly under the control of the terraces observed on top of the U1. All faults and tectonic deformation have only been observed under this Holocene unit. It is merely observed tectonic features (folding, undulation, faults) in the U1. The Holocene unit covered not only the tectonic structures and faults below the truncational erosion surface but also the older lithology, mainly folded and sometimes tightly folded.. The faults in the lower unit actually have low seismic activity.