ANALYSIS OF SHORT-PERIOD RAYLEIGH WAVES RECORDED IN THE BOHEMIAN MASSIF AREA DURING CELEBRATION 2000 EXPERIMENT M. MALINOWSKI Institute of Geophysics, Polish Academy of Sciences, Ks. Janusza 64, 01-452 Warsaw, Poland (michalm@igf.edu.pl) Received: October 22, 2004; Revised: April 21, 2005; Accepted: May 25, 2005 ABSTRACT The aim of this paper is to show the application of short-period surface waves recorded during deep seismic sounding experiment for constraining shallow velocity structure of the crust. Phase velocity of fundamental mode Rayleigh waves, observed along the CELEBRATION 2000 experiment profile CEL09, were obtained by a p-ω method and has been subsequently inverted for one-dimensional shear velocity models for the top 2 km. Multiple filter technique applied to one shot gather was used to carry out a joint inversion of phase and group velocity data and to provide γ R data to be used for Q β inversion. Validity of obtained V S and Q β models was confirmed by the reflectivity method. Noticeably, no clear dispersive wawes were observed in the Teplá-Barrandian Unit. Quasi-2D model based on the individual 1D V S models is well correlated with the surface geology. Lower V S are observed in the Saxothuringian Zone in comparison to the Moldanubian Zone. In the vicinity of the Central Bohemian and Moldanubian Plutons, the near-surface V S values are relatively low, but below 1 km depth, they are higher than in surrounding areas. We interpret it as the result of the weathering and cracks within the granitoid rocks. K e y w o r d s : Rayleigh waves, phase velocity, CELEBRATION 2000, uppermost crustal structure 1. INTRODUCTION Analysis of surface waves dispersion is a widely-used tool for studying the deep structure of the crust and upper mantle. There exist also some examples of use of surface waves data from wide-angle reflection and refraction experiments to constrain crustal Q-factors (e.g., Grad and Luosto, 1994; Grad et al., 1998) and crustal shear wave velocities (e.g., Mokhtar et al., 1988; Sarrate et al., 1993; Åström and Lund, 1993). In addition to typical ray-tracing techniques, used to interpret data from such kind of surveys, phase velocity data for Rayleigh waves provides complementary information and might be useful in constraining the shallow structure of the crust. Stud. Geophys. Geod., 49 (2005), 485−500 485 © 2005 StudiaGeo s.r.o., Prague