An Overview of Eastern Black Sea Crust Using Single Station Fundamental Mode Surface Wave Method

In this case study, crustal structure of the Eastern Black Sea (EBS) have been investigated by calculating and inverting group-velocity dispersion data of fundamental mode surface waves (Love and Rayleigh) using single-station method between the periods 4-40 seconds. For this purpose, we have used broad band (BB) recordings of three earthquakes recently occurred easternmost EBS recorded on KOERI (Kandilli Observatory and Earthquake Research Institute) BB stations (BZK, DIKM, KVT, SNOP). Computer Programs in Seismology package version 3.30 (Hermann, 2002) were used to both calculate observed fundamental mode group velocity dispersion curves and inversion of these curves to determine 1D shear wave crustal structure of the region. We have statistically averaged the group velocity dispersion curves for Love and Rayleigh waves. Then, mean dispersion curve of these waves has been inverted to determine 1D shear wave structure represents the region. Consequently, we have determined that there is a low-velocity zone in the upper crust corresponds to Maikop formation. The lower crust consists of oceanic/semi oceanic thickened crust. Moho depth is 31 km.