Channel and Crustal Rayleigh Waves

Panza, G. F.; Schwab, Fred; Knopoff, L.

doi:10.1111/j.1365-246x.1972.tb05813.x

Cited by 35 publications

(18 citation statements)

References 7 publications

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“…The modal expansion presents these two wavefields by one system of eigenfunctions which has no direct physical meaning. This phenomenon was discussed and explained in detail by LEVSHIN (1971), LEVSHIN et al (1972b), PANZA et al (1972; PANZA andCALCAGNILE (1975), PANZA, (1985). It is of interest to question whether or not we can discover these differencies in dispersion curves of crustal higher modes for group velocities below 4.35 km/s by applying customery techniques for mode separation?…”

Section: Crustal and Upper Mantle Surface Wavesmentioning

confidence: 99%

Caveats in Multi-modal Inversion of Seismic Surface Wavefields

Levshin

Panza

2006

Pure appl. geophys.

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We consider several examples demonstrating that the formal modal representation of surface wavefields often does not describe adequately observable wave parameters, such as the phase and group velocity dispersion of higher modes. The main reason for this is the existence in the medium of several waveguides or weakly coupled wavefields in the same waveguide. In such cases the separation of neighboring higher modes may be impossible, and observed dispersion curves may significantly differ from the ones predicted by the theory. From the example related to the studies of the crustal and upper mantle structure we found that the difficulty in the separation of first and second crustal higher modes can be overcome by applying a special inversion procedure. This procedure ignores the existence of a low velocity layer in the upper mantle when fitting the observable higher-mode dispersion curve to the one predicted by the model.

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Section: Crustal and Upper Mantle Surface Wavesmentioning

confidence: 99%

Caveats in Multi-modal Inversion of Seismic Surface Wavefields

Levshin

Panza

2006

Pure appl. geophys.

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“…The study of the short-period multimode dispersion and propagation characteristics of Rayleigh waves has been given by Panza, Schwab & Knopoff (1972). To continue to the next part of the programme, we must calculate the relative excitations and apparent initial phases of the various modes of Rayleigh waves excited by various sources.…”

Section: Introductionmentioning

confidence: 99%

Multimode Surface Waves for Selected Focal Mechanisms-II. Dip-Slip Sources*

Panza

Schwab

Knopoff

2007

Geophysical Journal of the Royal Astronomical Society

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“…The study of the short-period multimode dispersion and propagation characteristics of Rayleigh waves has been given by Panza, Schwab & Knopoff (1972). To continue to the next phase of the program we must calculate the relative excitation and phases of the various modes of Rayleigh waves excited by various sources.…”

Section: Introductionmentioning

confidence: 99%

“…If we adopt the far-field relation given by Ben-Menahem & Harkrider (1964): a wave propagating in the positive r direction with retrograde elliptical particle motion, U , leads U , by x/2 radians and E~ is positive only if z is chosen to increase upward. If, however, as inPanza et al (1972),Haskell (1953), and the first part of Harkrider (1964), z is chosen positive downward, U, leads U , by 3n/2 radians.…”

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confidence: 99%