SWRT: A package for semi-analytical solutions of surface wave propagation, including mode conversion, across transversely aligned vertical discontinuities

Datta, Arjun

doi:10.5194/gi-2017-46

Cited by 2 publications

(3 citation statements)

References 6 publications

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“… Transmission coefficients for a Love wave entering the Los Angeles basin obtained using a 1D mode‐coupling theory (Brissaud et al., 2020; Datta, 2018). This represents a worst‐case mode‐conversion scenario, with the true basin exhibiting a smoother horizontal gradient and hence less conversion.…”

Section: Inversion Methodologymentioning

confidence: 99%

“…The relative amplification of Love waves directly observed between two locations can then be calculated by

\frac{{a}_{1}}{{a}_{2}}={\left(\frac{{c}_{{g}_{1}}{I}_{1}}{{c}_{{g}_{2}}{I}_{2}}\right)}^{-1/2},

with

I={\int }_{0}^{\infty }\rho (z)u{(z)}^{2}dz

(Bowden et al., 2017; Bowden & Tsai, 2017). Transmission coefficients obtained using a 1D mode‐conversion theory (Brissaud et al., 2020; Datta, 2018), applied to Love waves transmitting from a characteristic out‐of‐basin velocity and density profile to an in‐basin profile, are plotted in Figure 9. The results of this mode‐conversion test suggest that any potential modeling error from neglecting mode‐coupling is small.…”

Section: Inversion Methodologymentioning

confidence: 99%

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Parsimonious Velocity Inversion Applied to the Los Angeles Basin, CA

et al. 2022

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Section: Inversion Methodologymentioning

confidence: 99%

“…The relative amplification of Love waves directly observed between two locations can then be calculated by

\frac{{a}_{1}}{{a}_{2}}={\left(\frac{{c}_{{g}_{1}}{I}_{1}}{{c}_{{g}_{2}}{I}_{2}}\right)}^{-1/2},

with

I={\int }_{0}^{\infty }\rho (z)u{(z)}^{2}dz

Section: Inversion Methodologymentioning

confidence: 99%

Parsimonious Velocity Inversion Applied to the Los Angeles Basin, CA

et al. 2022

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“…To evaluate expressions (4) and (5), we solve the surface-wave eigenvalue problem by the method of Gomberg & Masters (1988), as in Datta et al (2017); Datta (2018). This gives phase velocity c, group velocity U and the eigenfunctions r 1 , r 2 and l 1 , which are numerically integrated to obtain the energy integral I 1 .…”

Section: Computation Of the Green's Functionmentioning

confidence: 99%

Rayleigh wave H/V amplitude ratio measurement using multicomponent ambient noise cross-correlations, and its relationship to Vp/Vs

Malkoti¹,

Datta²,

Hanasoge³

2020

Preprint

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The promise of passive seismology has increasingly been realized in recent years.Given the expense in installing and maintaining seismic station networks, it is important to extract as much information from the measurements as possible. In this context, the ellipticity or H /V amplitude ratio of Rayleigh waves can prove to be a valuable observable in ambient noise seismology due to its complimentary sensitivity to subsurface structure, compared to phase and group-velocity dispersion, as well as its potential for constraining V P structure in addition to V S . However, the suitability of the Rayleigh H/V ratio in noise-based studies depends on the accurate interpretation of measurements made on multi-component ambient-noise cross-correlations. We present a synthetic study that critically examines measurements commonly interpreted as the Rayleigh wave H/V ratio, under realistic scenarios of spatially distributed and non-uniform noise sources. Using the surface wave terms of Green's function in a laterally homogeneous medium, we rigorously model multi-component cross-correlations for arbitrary noise-source distributions and extract from them standard estimates of the H/V ratio. Variation of these measurements as a function of V P is studied empirically, the theoretical Rayleigh wave H/V for the medium in question, when noise sources are strongly directional or anisotropic. Love waves, if present in the cross correlations, also have the potential to significantly bias interpretation. Accurate interpretation of the H/V ratio measurement thus rests on carefully modelling these effects. However, the sensitivity to V P structure is comparable to that of the classic Rayleigh wave H/V.We also propose a new measurement for cross-correlations that has slightly greater sensitivity to V P . Finally, uncertainty analysis on synthetic tests suggests that simplistic interpretations of Rayleigh wave ellipticity are only effective (in resolving V p structure) when the Love-wave contamination is negligible and measurement uncertainties are less than 10%.

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SWRT: A package for semi-analytical solutions of surface wave propagation, including mode conversion, across transversely aligned vertical discontinuities

Cited by 2 publications

References 6 publications

Parsimonious Velocity Inversion Applied to the Los Angeles Basin, CA

Parsimonious Velocity Inversion Applied to the Los Angeles Basin, CA

Rayleigh wave H/V amplitude ratio measurement using multicomponent ambient noise cross-correlations, and its relationship to Vp/Vs

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