A comprehensive dispersion model of surface wave phase and group velocity for the globe

Citation:
Ma, ZT, Masters G, Laske G, Pasyanos M.  2014.  A comprehensive dispersion model of surface wave phase and group velocity for the globe. Geophysical Journal International. 199:113-135.

Date Published:

2014/10

Keywords:

anisotropic structure, least-squares, love, maps, pacific, polarization data, rayleigh-waves, seismic anisotropy, Seismic tomography, shear, surface waves and free oscillations, upper-mantle

Abstract:

A new method is developed to measure Rayleigh- and Love-wave phase velocities globally using a cluster analysis technique. This method clusters similar waveforms recorded at different stations from a single event and allows users to make measurements on hundreds of waveforms, which are filtered at a series of frequency ranges, at the same time. It also requires minimal amount of user interaction and allows easy assessment of the data quality. This method produces a large amount of phase delay measurements in a manageable time frame. Because there is a strong trade-off between the isotropic part of the Rayleigh-wave phase velocity and azimuthal anisotropy, we include the effect of azimuthal anisotropy in our inversions in order to obtain reliable isotropic phase velocity. We use b-splines to combine these isotropic phase velocity maps with our previous group velocity maps to produce an internally consistent global surface wave dispersion model.

Notes:

n/a

Website

DOI:

10.1093/gji/ggu246