Global Compilation of Phase and Group Velocities of Fundamental Mode Rayleigh Waves in the Period Range 20 to 100 sec

Abstract

We collected a large aÍlount of phase. velocity data for fundamental mode Rayleigh waves with period ranging between 2O and IOO seconds from. the literature. These data were classified and organized in a way that can now be used by other authors. These data were used to determine the average phase velocity for three regionalized and widely used Earth models. These values served as an initial model used in the unwrapping process of the phase spectra measured in the second part of our study, where we studied the records of Rayleigh waves generated by a set of45 earttrquakes, which had their source mechanism and focal depth determined by other authors. The data from this second part of the study conplement the data collected from the existing literature. We have then obtained an increased (we had more than doubled the initial amount of data available) data set which also includes the group velocity data from the second part of our study.This increased data set is orgapized to faciliøæ future studies on wave propagation, source mechanics and Earth structure.