First evidences on the Active Tectonics of the Lake Sapanca Extending Along the North Anatolian Fault in the Eastern Marmara Region of Turkey using New Bathymetric and Seismic Data
Abstract
Lake Sapanca located in the Eastern Marmara region of Turkey is one of the tectonic lake constituted by North Anatolian Fault (NAF). The lake is elongated 16 km in the east-west direction and 5 km in the north-south direction. It is located 33 m above sea level and its maximum depth is approximately 53 m. The area in which the lake is located is on the Izmit-Sapanca Corridor, which is bordered by the segments of the northern branch of the NAF, between the Samanlı Mountains to the south and the Kocaeli Peneplain to the north.
It is suggested that Lake Sapanca is a pull-apart basin depending on the geometry of the NAF in this region. This interpretation is generally based on the low resolution bathymetric changes in the lake particularly in extension of the faults observed on land into the lake and is not a sufficient to explain the idea. This suggestion should be tested by using new high resolution geophysical data. Because strike-slip faults may not cause disturbances in the bathymetry sometimes. One of the recognition ways of the strike-slip faults in the seismic sections are the differences in the layer thicknesses on either side of the fault or differences in geometry. Also, active faults can be clearly seen on the multibeam bathymetric images as spatially and continuity of the faults on the deeper parts can be seen from the seismic sections. Thus, multibeam bathymetry and high resolution seismic data were acquired in the lake Sapanca as a part of a TUBITAK project (Project No: 117Y130) in August 2018. Surface and deeper continuation of the NAF in the Lake Sapanca are studied by using these new geophysical data. Consequently, the traces of the formation of the lake by releasing bend rather than a pull-apart basin were observed with preliminary interpretations in multibeam bathymetry and seismic data.- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFMEP13D2173K
- Keywords:
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- 0935 Seismic methods;
- EXPLORATION GEOPHYSICS;
- 3022 Marine sediments: processes and transport;
- MARINE GEOLOGY AND GEOPHYSICS;
- 3025 Marine seismics;
- MARINE GEOLOGY AND GEOPHYSICS;
- 3045 Seafloor morphology;
- geology;
- and geophysics;
- MARINE GEOLOGY AND GEOPHYSICS