Akademik Veri Yönetim Sistemi
JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY, cilt.34, sa.4, ss.2215-2227, 2019 (SCI-Expanded)
The main purpose of this study is to investigate the three-dimensional (3-D) crustal seismic velocity structure of Hatay and its surroundings for the first time. With this motivation, 4892 local earthquakes recorded between 2007-2017 by 17 broad-band seismometers operated by Disaster and Emergency Management (AFAD) were analyzed. A total of 9907 P- and 7536 S-phase of 1856 earthquakes having at least 6 P-phase readings and RMS values less than 0.20 within initial catalog were used for tomographic calculations. The three layered seismic velocity structure which ranges from 3.5 km / sec to 7.5 km / sec is determined up to 30 km depth which is considered reliable depth in the light of synthetic tests for Hatay and its surroundings. Lithological and petrological evidences were found by interpreting the P- wave velocities and vertical seismic profiles of Vp / Vs. The seismic velocities with very low P-velocities (Vp <3.5 km / sec) in the first seismic layer which are in the form of a bowl extending to 5 km depth are detected. It is considered that the low Vp / Vs rates with low P-velocities around the village of Avsuyu and North part of Kirikhan region can be associated with the unexplored CO2, geothermal gasses or a mixture of them. Possible potential gases (CO2, steam or mixture of them) are transported along the Hacipasa and Karasu fault and they show high potential in terms of geothermal fluid of the region. Furthermore, the low P-velocities and high Vp / Vs ratio indicate potential geothermal liquids that have not been discovered in Reyhanli region yet. Crust-mantle transition (Moho discontinuity) was observed at about 35 km. The Vp / Vs character of the region is relatively homogeneous and ranges mostly from 1.75 to 1.85.