Investigation of the crustal velocity structures in the Central Anatolia

In this thesis P receiver function analysis is used to estimate the crustal and the upper mantle velocity structures beneath the Central Anatolia. To reach this goal, time domain P receiver of teleseismic events are computed, which are recorded by a total number of 5 broad-band stations, namely ANTO (Ankara), BBAL (Ankara), CDAG (Kırşehir), ELDT (Çankırı) and ILGA (Çankırı) which belong to actively operating General Directorate of Disaster Affairs, Earthquake Research Department, Seismology Division of Ankara. Moreover, computed radial receiver functions and regional surface wave group velocities are inverted as weighted in each individual earthquake station; thus, non-uniqueness problem is solved.Inversion results show that crustal thicknesses and shear velocities beneath the stations ANTO, BBAL, CDAG, ELDT, ILGA are stated 36 km, 4.33 km/s; 38 km, 4.28 km/s; 40 km, 4.33 km/s; 36 km, 4.21 km/s and 36 km, 4.20 km/s, respectively. This result indicates that crustal thickening is present from the north to the south. The reason of rising crustal thickening to south is that the area is compressed by paleosutures of Toroids from south and of Izmir-Ankara-Erzincan from north and Ezinepazarı-Tuz Gölü Fault, Ecemiş Fault, Kırıkkale-Erbaa Fault tectonically. Upper-mantle shear velocities vary from 2.20 to 3.49 km/s beneath the stations and upper-mantle velocity is <7.8 km/s. No abnormal low velocity zone (LVZ) at middle-crust and upper-crust is observed.