Wave Propagation at Regional Distances
Abstract
Wave propagation in Fennoscandia is generally understandable in terms of simple plane layered structure models. Although the data show deviations from such models in terms of effects of layer dip, discrete phases are generated by these crust and mantle structures and are not significantly degraded by heterogeneity. Phase attributes, such as time and phase velocity, can be used to accurately identify arrivals. It was found that S waves are often misidentified at NORESS resulting in poor event locations. The nature of lithospheric heterogeneity which produces P waves coda may be amenable to analysis since it was found that scatterer anisotropy appeared to be the strongest effect in controlling coda decay rate in the wave propagation simulations. The NORESS data suggest that scattering in the vicinity of the array is caused by highly anisotropic scatterers (plane-layered-like) with the exception of discrete scattering events caused by P-to-Rg scattering off of topographic features.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 23, 1991
- Accession Number
- ADA246890
Entities
People
- Charles A. Langston
Organizations
- Pennsylvania State University