High-resolution Crustal Lg-wave Attenuation Tomography in the Anatolian Plateau and Surrounding Regions

TheAnatolian Plateau is formed by the collision and convergence of the African, Arabian and Eurasian plates, and it consists of several lithospheric blocks and continental fragments, which were amalgamated during the closure of the Paleotethys Ocean in the mid-Triassic and the Neotethys ocean in the late Cretaceous/Paleocene to middle Miocene (Şengör and Yilmaz, 1981) . Complex tectonic activities, strong seismicity and volcanic activities widely spread in the entire Anatolian plateau, including three large-scale fault systems (the northern, the eastern and the Dead Sea fault zones), and the intensely deformed areas such as the Aegean-Cyprus arc and the Bitlis-Zagros suture zone. As the most prominent phase in regional seismograms, Lg wave mainly propagates within the continental crust, and its amplitude is sensitive to thermal related activities. Therefore, high-resolution Lg wave Q tomography enables us to better understand the rheological properties of crustal materials, particularly those related to high-temperature and partial melting. Previous studies obtained lateral inhomogeneity of the QLg across the Anatolian plateau, and suggested that the low Q values related to thermal anomalies in the crust(Akinciet al., 1995; Pasyanoset al., 2009; Sahinet al., 2013; Zhao and Xie, 2016; Zoret al., 2007) . In this study we construct a high-resolution (?) crustal attenuation model for the Anatolian plateau and surrounding regions. Our results show that Q values in the central Anatolian plateau are relatively high, while strong crustal Lg wave attenuations in the east correspond to volcanic activities. In western part of the plateau, north-south trend low-Q belts may be related to the extensionalactivities. In Isparta region located in the southwest of Anatolian plateau, low Q values in the crust suggest that hot mantle materials may move upward and cause partial melting there.