Guided Waves and Rayleigh Leaking Modes With Outpost Algorithm

Znak, Pavel; Kashtan, Boris; Bakulin, Andrey

doi:10.3997/2214-4609.201413310

Cited by 3 publications

(3 citation statements)

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“…The attenuation curves of the three PL modes are specially drawn in Figure 11. It is evident that the three PL modes all display maximas and minimas periodically and that's why the pronounced tuning effect of leaky modes is reported in the literature (Roth et al, 1998;Znak et al, 2015). As a band-pass filter (see Figure 12 for the effect of PL modes), the PL modes may even have wavenumbers with the imaginary parts bei `ng almost zero (Figure 11), which, as slowlyattenuating P-SV leaky waves, were extensively studied by Garcí a-Jerez and Sá nchez-Sesma (2015).…”

Section: Case 1: a Near-surface Modelmentioning

confidence: 81%

“…Because the PL modes in Figure 18 are found to have negligible energy below 200 m deep, this may account for the decrease in the number and the strength of the excited modes when the source depth is increased to 200 m (Figure 17). Were the source not a point source but a horizontal force source, some OP modes would be expected to appear on the spectrum, as illustrated by Znak et al (2015). First, based on the synthetic seismograms generated by the DWM and the NMM, we find that for a given model the contribution of leaky modes to the resultant seismograms depends upon the source mechanism and the source depth (the receiver is assumed to be on the surface).…”

Section: Case 2: a Shallow-water Modelmentioning

confidence: 93%

“…Recently, a great interest in leaky modes arises and consequent studies have been undertaken both from theoretical and observational or application perspectives (Furumura and Kennett, 2018;Znak et al, 2015;Gao et al, 2014;Wu and Chen, 2017;Ma et al, 2019;Garcí a-Jerez and Sá nchez-Sesma, 2015;Li et al, 2021;Li et al, 2022). Leaky modes physically describe travelling disturbances that leak at least S waves into the substratum.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical investigation of the excitation of leaky modes for multi-layered models

Shi

Chen

et al. 2022

Preprint

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With the advent of the array-based methods, the observations of leaky modes from earthquake records and ambient noise are frequently reported. It is urgently needed to have an effective guide to the selection of certain leaky modes to put into practical inversion combined with other imaging methods. To this end the excitation of leaky modes for multi-layered models is theoretically investigated. By computing theoretical seismograms for different source mechanisms and different source depths with the discrete wavenumber method and the normal-mode summation method separately, the contribution of leaky modes to the resultant seismograms is qualitatively evaluated and the effect of the source depth for the same source mechanism is in detail examined. Further, we perform accurate computation of leaky modes for two models and categorize the leaky modes into PL and OP (organ-pipe) modes, whose distinctive properties are characterized both from the attenuation and from the eigen-displacements of these two types of modes. Also, these results could help explain very well the occurrence of certain leaky modes on the dispersion spectrum and be indicative of the reasonable choice of certain leaky modes to put them into practical inversion for P-velocity structures.

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Section: Case 1: a Near-surface Modelmentioning

confidence: 81%

Section: Case 2: a Shallow-water Modelmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Theoretical investigation of the excitation of leaky modes for multi-layered models

Shi

Chen

et al. 2022

Preprint

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Simultaneous Estimation of P- and S-Wave Velocities by Integrated Inversion of Guided-P and Surface Wave Dispersion Curves

Wang,

Sun,

2024

Surv Geophys

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Theoretical investigation of the excitation of leaky modes for multilayered models

Wu,

Shi,

Chen

et al. 2024

Geophysical Journal International

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Summary The dispersion analysis with array-based methods enables us to detect and analyse the multi-mode dispersive waves with weak amplitudes. Over the past years, there has been widespread extraction of higher normal modes from earthquake records and ambient noise, which have been extensively employed in near-surface and crustal investigations. Notably, the frequent reporting of leaky modes in recent observations has gained significant attention. This is because leaky modes can provide more constraints on subsurface structures. Particularly, a subset of leaky modes is found to be sensitive to P-wave velocities, which has the potential to compensate for the limitations of traditional surface wave inversion. Nevertheless, due to the lack of knowledge of the excitation and practical application of leaky modes, it is urgent to have an effective guide in selecting certain leaky modes for practical inversion combined with other imaging methods. To this end, the theoretical investigation into the excitation of leaky modes for multi-layered models is undertaken. By computing theoretical seismograms for various source mechanisms and source depths with the discrete wavenumber method and the normal-mode summation method respectively, the qualitative evaluation of the leaky-mode contributions to the synthesized seismograms is conducted. Additionally, the impact of the source depth for the same source mechanism is meticulously examined by the dispersion spectra. Furthermore, with the accurate computation of leaky modes, we categorize the leaky modes into PL and OP (organ-pipe) modes according to their distinctive properties, i.e., their attenuation and eigen-displacements, which may be used to explain very well the occurrence of certain leaky modes on the dispersion spectrum and be indicative of the reasonable choice of PL modes to put them into practical inversion for P-velocity structures.

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Guided Waves and Rayleigh Leaking Modes With Outpost Algorithm

Cited by 3 publications

References 0 publications

Theoretical investigation of the excitation of leaky modes for multi-layered models

Theoretical investigation of the excitation of leaky modes for multi-layered models

Simultaneous Estimation of P- and S-Wave Velocities by Integrated Inversion of Guided-P and Surface Wave Dispersion Curves

Theoretical investigation of the excitation of leaky modes for multilayered models

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