Crust and Upper-mantle Structure in Anatolia from Analysis of Love Wave Group Velocity

Abstract

The environmental noise, the noise related to signal, the equal sharing of seismic energy between the components and the other factors effect discrimination of surface waves forms on seismograms. The differences between polarization properties of surface waves and microseismic noise permit to filtering a desired surface waves kinds on three components records. Dispersion property of surface waves, i.e. changes in seismic velocities and absorption as depending on frequency, has been used to investigate the Earth crust and upper mantle structure. In order to investigation of the Anatolian crust structure, it has been selected the profiles across east-west trending the Anatolia. To create these profiles, long period three component digital records at six stations (YLVX, MRMX, MLSB, ISP, ISK,EDRB) of KOERI network having about 10 epicentral distance of an earthquake (EZM) were taken. Surface wave discrimination filter based on the polarization has been applied to three component records of all stations for making more convenient the surface wave records. Multiple filter technique has been applied to discriminated surface waves and detected the group velocities. A five layered crustal model having total thickness of 38-40 km and Pn-wave velocity of 8.00 km/sec in the upper-mantle have been determined by inversion process.