Lateral variations of attenuation coefficients, group and phase velocities of rayleigh waves in Europe |
| |
| Authors: | Antoni M Correig Maria T Susagna Xavier Lana |
| |
| Abstract: | Rayleigh wave group and phase velocities and attenuation coefficients are investigated in the 15–60-s period range for earthquakes occurring in the European area and registered at European stations. Observed group and phase velocities show clear differences in the period range 20–40 s, whereas attenuation coefficients are differentiated from 45 s to larger periods. From the shape of dispersion and attenuation curves, two broad zones have been isolated and designated as Western Europe and Southeastern Europe. Although some scatter is present, specially for attenuation, the data suggest that in general the shear velocity and Qβ values are higher for Southeastern Europe than for Western Europe. For Southeastern Europe there is a channel of low velocity and low Qβ, apparently correlated, located at the lower crust: in both regions there is a channel of low velocity and low Qβ values located at the uppermost mantle. In each case there also exists a channel of high Qβ values located at the lower crust but at slightly different depths. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
