Crust and Upper Mantle S Wave Velocity Structure in Turkey Based on Ambient Noise Tomography

Turkey belongs to the initial collision stage of the Tethys tectonic domain. The western part of Turkey experiences the subduction of the African plate, while the eastern part suffers the collision with the Arabian plate. In addition, extensive volcanic activity and tectonic uplift are also distributed in this region. To understand the relationship between these surface phenomena and underground structure, it is necessary to obtain reliable and precise velocity structure in the region. We collect continuous waveform data from 688 stations in the region and obtain Rayleigh wave dispersion curves for periods between 4 and 100 s based on frequency-Bessel transform dispersion analysis. We then perform quasi-Newton inversion to calculate the S wave velocity structure between 0 and 200 km. Subsequently, the reliability of the results is verified using a model validation method based on waveform simulation. Our results elucidate the layered structure and distribution of the lithosphere asthenosphere boundary beneath the region, which is of great significance for a profound understanding of the tectonic evolution process in the region. At the same time, it also provides reliable data support for subsequent waveform inversion and earthquake mechanism research in the region.