Simulation of Regional Seismic Phases
Abstract
This report summarizes efforts to simulate the characteristics of regional seismic phases from earthquakes and explosions. The objective is to use computer generated seismograms to aid our understanding of the origin of regional phases and to examine possible discriminants in regional recordings from earthquakes and explosions. This involves four distinct studies. First, the source-depth dependence of the phase Lg is examined. It is found that the depth dependence of synthetic Lg for double-couple sources can be explained by changes in material properties over crustal depths combined with radiation pattern effects for S-waves radiated with the phase velocities appropriate to Lg. The second effort reported is a study for the Basin and Range, most of the energy is trapped above an intermediate crustal reflector, whereas eastern United States and Eurasian crustal structures Lg was found to be a guided wave between the earth's surface and the Moho. third, differences in the characteristics of Lg radiated from earthquakes and explosions. Finally, the behavior of Lg codas as they are transmitted across boundaries between two different crustal structures.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1982
- Accession Number
- ADA118952
Entities
People
- H. J. Swanger
Organizations
- Utility Systems Science and Software (United States)