Abstract
In this study, the crust and upper mantle structure of Anatolia have been investigated by measuring the group velocity dispersion data of discriminated seismic surface waves. In the scope of the study, it has selected the profiles between six stations located in western Anatolia of Bogazici University Kandilli Observatory Earthquake Research Institute, national network of Turkey, and records of an earthquake (having about 10° epicentral distance) occurred in the eastern of Anatolia have been used. Firstly, surface wave discrimination filter based on the polarization properties has been applied tothree-component recordsand emphasized to surface waves. Then the group velocities have been calculated by multiple filter technique. 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 has been determined through inversion of surface wave group velocity dispersion data in the period range of 10 sec to 60 sec.
Highlights
The differences between polarization properties of surface waves and microseismic noise allow filtering a type of the desired surface waves on three-component records [1]-[8]
The crust and upper mantle structure of Anatolia have been investigated by measuring the group velocity dispersion data of discriminated seismic surface waves
The crust and upper mantle structure for profiles between event and station have been determined by inversion process using these group velocities
Summary
The differences between polarization properties of surface waves and microseismic noise allow filtering a type of the desired surface waves on three-component records [1]-[8]. Reference [37] found an uppermost mantle Pn-wave velocity of 8.1 km/sec for western Turkey and 7.9 km/sec for eastern Turkey using travel times and station residuals of P-waves and phase and group velocities of surface waves. A 3-D upper-mantle structure beneath Turkey is investigated by [24] using phase speeds of fundamental-mode Rayleigh waves employing a conventional two-station method with high-density seismic networks in Turkey and the three-dimensional S-wave model was obtained in the depth range of 40 to 180 km using the phase velocity maps in the period range of 25 to 120 s. The crust and upper mantle structure of Anatolia have been investigated by measuring the group velocity dispersion data of discriminated seismic surface waves. The crust and upper mantle structure for profiles between event and station have been determined by inversion process using these group velocities
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