Erratum: Interstation phase speed and amplitude measurements of surface waves with nonlinear waveform fitting: application to USArray

Erratum: Interstation phase speed and amplitude measurements of surface waves with nonlinear... Erratum of the paper ‘Interstation phase speed and amplitude measurements of surface waves with nonlinear waveform fitting: application to USArray’, by K. Hamada and K. Yoshizawa, published in Geophys. J. Int. (2015) 202, 1463–1482. We have recently found an error in our original model derived from joint inversions of phase and amplitude data, due to an incorrect evaluation of relative data misfit between phase and amplitude in an original numerical code, resulting in the underestimation of amplitude effects on phase speed models and station correction terms. Here we present corrected figures of phase speed maps and station correction terms for Figs 13–15. In the reconstruction of these models with a corrected program, we have to reevaluate the variance reductions (Fig. 14b), and redetermine the weighting factor (p = 0.5 is chosen as our preferred weighting factor for the corrected joint inversion). This modification causes rather minor influence on the phase speed models and spatial patterns of station correction terms, but the scale of station correction terms (Fig. 14c) has been modified to be proper values (larger than the original plot). Discussion and conclusions of our original paper are unaffected by this correction, but some numerical values described in fifth to seventh paragraphs in section 4.2 of the original paper have to be slightly modified accordingly. We summarize the corrected sentences below: (fifth paragraph of section 4.2, page 49 of the original paper) Figure 13. View largeDownload slide Checkerboard resolution tests with the joint inversion of phase and amplitude data for Rayleigh waves at 80 s, for a varying weight factor p on phase data. Figure 13. View largeDownload slide Checkerboard resolution tests with the joint inversion of phase and amplitude data for Rayleigh waves at 80 s, for a varying weight factor p on phase data. ‘The average strengths of retrieved phase speed perturbations with respect to the input model, calculated in the area encompassed by the black line in Fig. 13, are 63 per cent for phase data only (p = 1.0), 68 per cent (p = 0.5), 71 per cent (p = 0.3), and 84 per cent for amplitude data only (p = 0.0).’ (sixth paragraph of section 4.2, page 49 of the original paper) ‘In this study, we choose the map for p = 0.5 (giving equal weight to both phase and amplitude data) as the best compromised model derived from our phase and amplitude data.’ (seventh paragraph of section 4.2, page 49 of the original paper) ‘The correlations between the two models are 0.82–0.90 for Rayleigh waves.’ Figure 14. View largeDownload slide (a) Phase speed maps from the joint inversions of Rayleigh-wave phase and amplitude data at 60 s with a different data weight factor p which varies from 0 to 1. (b) Variance reductions of amplitude (blue) and phase (red) as a function of the data weight factor p. (c) Spatial distributions of the station-correction term. Figure 14. View largeDownload slide (a) Phase speed maps from the joint inversions of Rayleigh-wave phase and amplitude data at 60 s with a different data weight factor p which varies from 0 to 1. (b) Variance reductions of amplitude (blue) and phase (red) as a function of the data weight factor p. (c) Spatial distributions of the station-correction term. Figure 15. View largeDownload slide Comparisons between the phase speed models derived from (left) this study and (right) an earlier work by Foster et al. (2014) for (a) Rayleigh waves at 60 s (joint inversion of phase and amplitude data) and (b) Love waves at 40 s (phase data only). Figure 15. View largeDownload slide Comparisons between the phase speed models derived from (left) this study and (right) an earlier work by Foster et al. (2014) for (a) Rayleigh waves at 60 s (joint inversion of phase and amplitude data) and (b) Love waves at 40 s (phase data only). REFERENCE Foster A., Ekstrom G., Nettles M., 2014. Surface wave phase velocities of the Western United States from a two-station method, Geophys. J. Int. , 196( 2), 1189– 1206. Google Scholar CrossRef Search ADS   © The Authors 2017. Published by Oxford University Press on behalf of The Royal Astronomical Society. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Geophysical Journal International Oxford University Press

Erratum: Interstation phase speed and amplitude measurements of surface waves with nonlinear waveform fitting: application to USArray

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Publisher
The Royal Astronomical Society
Copyright
© The Authors 2017. Published by Oxford University Press on behalf of The Royal Astronomical Society.
ISSN
0956-540X
eISSN
1365-246X
D.O.I.
10.1093/gji/ggx440
Publisher site
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Abstract

Erratum of the paper ‘Interstation phase speed and amplitude measurements of surface waves with nonlinear waveform fitting: application to USArray’, by K. Hamada and K. Yoshizawa, published in Geophys. J. Int. (2015) 202, 1463–1482. We have recently found an error in our original model derived from joint inversions of phase and amplitude data, due to an incorrect evaluation of relative data misfit between phase and amplitude in an original numerical code, resulting in the underestimation of amplitude effects on phase speed models and station correction terms. Here we present corrected figures of phase speed maps and station correction terms for Figs 13–15. In the reconstruction of these models with a corrected program, we have to reevaluate the variance reductions (Fig. 14b), and redetermine the weighting factor (p = 0.5 is chosen as our preferred weighting factor for the corrected joint inversion). This modification causes rather minor influence on the phase speed models and spatial patterns of station correction terms, but the scale of station correction terms (Fig. 14c) has been modified to be proper values (larger than the original plot). Discussion and conclusions of our original paper are unaffected by this correction, but some numerical values described in fifth to seventh paragraphs in section 4.2 of the original paper have to be slightly modified accordingly. We summarize the corrected sentences below: (fifth paragraph of section 4.2, page 49 of the original paper) Figure 13. View largeDownload slide Checkerboard resolution tests with the joint inversion of phase and amplitude data for Rayleigh waves at 80 s, for a varying weight factor p on phase data. Figure 13. View largeDownload slide Checkerboard resolution tests with the joint inversion of phase and amplitude data for Rayleigh waves at 80 s, for a varying weight factor p on phase data. ‘The average strengths of retrieved phase speed perturbations with respect to the input model, calculated in the area encompassed by the black line in Fig. 13, are 63 per cent for phase data only (p = 1.0), 68 per cent (p = 0.5), 71 per cent (p = 0.3), and 84 per cent for amplitude data only (p = 0.0).’ (sixth paragraph of section 4.2, page 49 of the original paper) ‘In this study, we choose the map for p = 0.5 (giving equal weight to both phase and amplitude data) as the best compromised model derived from our phase and amplitude data.’ (seventh paragraph of section 4.2, page 49 of the original paper) ‘The correlations between the two models are 0.82–0.90 for Rayleigh waves.’ Figure 14. View largeDownload slide (a) Phase speed maps from the joint inversions of Rayleigh-wave phase and amplitude data at 60 s with a different data weight factor p which varies from 0 to 1. (b) Variance reductions of amplitude (blue) and phase (red) as a function of the data weight factor p. (c) Spatial distributions of the station-correction term. Figure 14. View largeDownload slide (a) Phase speed maps from the joint inversions of Rayleigh-wave phase and amplitude data at 60 s with a different data weight factor p which varies from 0 to 1. (b) Variance reductions of amplitude (blue) and phase (red) as a function of the data weight factor p. (c) Spatial distributions of the station-correction term. Figure 15. View largeDownload slide Comparisons between the phase speed models derived from (left) this study and (right) an earlier work by Foster et al. (2014) for (a) Rayleigh waves at 60 s (joint inversion of phase and amplitude data) and (b) Love waves at 40 s (phase data only). Figure 15. View largeDownload slide Comparisons between the phase speed models derived from (left) this study and (right) an earlier work by Foster et al. (2014) for (a) Rayleigh waves at 60 s (joint inversion of phase and amplitude data) and (b) Love waves at 40 s (phase data only). REFERENCE Foster A., Ekstrom G., Nettles M., 2014. Surface wave phase velocities of the Western United States from a two-station method, Geophys. J. Int. , 196( 2), 1189– 1206. Google Scholar CrossRef Search ADS   © The Authors 2017. Published by Oxford University Press on behalf of The Royal Astronomical Society.

Journal

Geophysical Journal InternationalOxford University Press

Published: Feb 1, 2018

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