Electronic Supplements to
Near-Surface Velocity Structure of Pacaya Volcano, Guatemala, Derived from Small-Aperture Array Analysis of Seismic Tremor

by Federica Lanza, Lindsey M. Kenyon, and Gregory P. Waite

This electronic supplement contains two figures that show S-wave velocity models obtained from inversion and Love- and Rayleigh-wave dispersion curves. Figure S1 shows an example of the dependence of the results on the starting model and the results of different inversions obtained with different starting parameters. Figure S2 shows the effects of changes in the initial VP/VS ratio on the retrieved velocity structures. All the models have comparable fits to the dispersion data, indicating that Rayleigh-wave and Love-wave velocities are more dependent on the shear velocity structure rather than on density and Poisson ratio.


Figures

Figure S1. Examples of some of the estimates of the shear-wave velocity models obtained from inversions for Rayleigh- and Love-wave dispersion curves using different numbers of layers, thicknesses of layers, and starting velocities. Open circles represent the phase velocity data obtained from the zero crossings, maxima, and minima of the correlation functions for the seven distinct radii. Individual curves are the best-fitting phase velocity curves for each model considered.

Figure S2. Estimate of the shear-wave velocity models obtained from inversions for Rayleigh- and Love-wave dispersion curves using different initial Poisson ratios (nu). The thick solid line corresponds to the model with the minimum misfit to the dispersion curves. Open circles represent the phase velocity data obtained from the zero crossings, maxima, and minima of the correlation functions for the seven distinct radii. Individual curves are the best-fitting phase velocity curves for each model considered.

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