Improved Surface Wave Dispersion Models, Amplitude Measurements and Azimuth Estimates

摘要

The goal of this project is to reduce the magnitude threshold for which surface waves can be identified and measured reliably, and to improve the accuracy of surface wave measurement, using phase-matched filtering and global regionalized earth and dispersion models. Significant products and results of this work include: (1) assembly of a data set of dispersion measurements of over one million data points; (2) tomographic inversion of this data set for global earth and dispersion models; (3) implementation and testing of an improved azimuth estimation technique using Rayleigh wave polarization; (4) implementation and testing of a path corrected spectral magnitude. The path corrected spectral magnitude is a 'regional Ms' which has been a long-term goal of this program. The global earth and dispersion models are available on request to other researchers working in this program.