Eastern Anatolian Journal of Science, vol.1, no.1, pp.57-69, 2015 (Peer-Reviewed Journal)
The main aim of this study is to determine 1-D shear-velocity structure of the Eastern Anatolian region from the inversion of single-station Rayleigh’s wave group velocity data in the period range of 4-35 seconds, approximately. For this purpose, we used vertical component seismograms of the 2011 Van Earthquake main shock, and its 10 aftershocks recorded at 9 broadband stations of Kandilli Observatory and Earthquake Research Institute (KOERI). Considering each sourcestation path, the wave paths were divided into three distinct group. The average group velocity dispersion curves were generated from 14 paths for the first group, 7 paths for the second group, and 13 paths for the third group. These averages were inverted to determine 1-D shear wave velocity structure of the studied region. In addition to this, we calculated the normalized statistical resolution matrix to obtain resolution-length information for total inverse system. According to inversion results, the crustal thickness is approximately 42 km in the study area and S-wave (Sn) velocity ranges between 4.19-4.29 km/s in the Moho. It is clearly seen that shear velocities vary from ∼2.8–3.2 km/s in the upper crust (10-12 km) to ∼3.6 km/s in the lower crust (~35 km). The results of this study are in good agreement with previous studies, and will help to improve S-wave velocity models proposed for Eastern Anatolia and surrounding areas.