Lg Wave Excitation and Propagation in the Presence of One-, Two-, and Three-Dimensional Heterogeneities

摘要

The scattering of Lg waves by point heterogeneities in a crustal waveguide is considered. Computer simulations lead to inferences of the behavior of the scattering mechanism which helps understand observed facts about the shear wave coda, especially the relationship between the lag time at which measurements are made and the inferred coda Q. A second study reports on problems on some routine processing techniques used for long period surface wave analysis. The influence of spectral shape on inferred spectral amplitudes is discussed.