Fast Surface Wave and Free Mode Computations

Schwab, Fred; Knopoff, L.

doi:10.1016/b978-0-12-460811-5.50008-8

Cited by 208 publications

(185 citation statements)

References 22 publications

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“…At each pixel, we next invert the corresponding dispersion curve to find V s in six distinct layers (40 -60 km, 60 -100 km, 100-150 km, 150 -220 km, 220-310 km and 310-400 km). In the assumption of a perfectly elastic upper mantle (i.e., neglect of attenuation), we use Knopoff's method [Schwab and Knopoff, 1970], to calculate a synthetic dispersion curve for each seismic profile generated by our search algorithm. The search algorithm consists of a gradientdescent inversion [Tarantola, 2005] subsequently refined by a Monte-Carlo search.…”

Section: Methodsmentioning

confidence: 99%

A new finite‐frequency shear‐velocity model of the European‐Mediterranean region

Peter

Boschi

Deschamps

et al. 2008

Geophysical Research Letters

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[1] We invert a global phase-anomaly database of intermediate-to long-period Rayleigh waves, recently updated with increased coverage in the EuropeanMediterranean region, on a global scale with a higher resolution parameterization in the region of interest. We first compare phase-velocity inversions based on ray and finitefrequency theory and derive for each a corresponding set of local phase-velocity dispersion curves (one per model pixel) between 35 s to 300 s period. Effects of the two different theories on the three-dimensional upper-mantle structure are investigated by inverting each dispersion curve for radial shear-velocity profiles. The combination of a gradientdescent method and a random-Monte-Carlo model search provides an estimated shear-velocity model with associated uncertainties for depths between 40 km to 400 km. While differences between ray-theoretical and finite-frequency models are small compared to model uncertainty, comparisons with independent models favor the finitefrequency one.

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Section: Methodsmentioning

confidence: 99%

A new finite‐frequency shear‐velocity model of the European‐Mediterranean region

Peter

Boschi

Deschamps

et al. 2008

Geophysical Research Letters

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“…Surface wave propagation theory provides equations and methods to calculate the theoretical dispersion curves (modes) of Rayleigh surface waves for such systems [11,12].…”

Section: Inversionmentioning

confidence: 99%

Condition assessment of concrete in hydraulic structures by surface wave non-destructive testing

2008

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1617/s11527-008-9382-x Materials and Structures, 42, 2, pp. 251-261, 2009-03-01 Condition assessment of concrete in hydraulic structures by surface wave non-destructive testing Al Wardany, R.; Ballivy, G.; Rivard, P.http://irc.nrc-cnrc.gc.ca Condit ion a sse ssm e nt of c onc re t e in hydra ulic st ruc t ure s by surfa c e w ave non-de st ruc t ive t e st ing NRCC-49491Al Wardany, R.; Ballivy, G.; Rivard, P. March 2009A version of this document is published in / Une version de ce document se trouve dans: Materials and Structures, v, 42,no. 2, The material in this document is covered by the provisions of the Copyright Act, by Canadian laws, policies, regulations and international agreements. Such provisions serve to identify the information source and, in specific instances, to prohibit reproduction of materials without written permission. For more information visit http://laws.justice.gc.ca/en/showtdm/cs/C-42Les renseignements dans ce document sont protégés par la Loi sur le droit d'auteur, par les lois, les politiques et les règlements du Canada et des accords internationaux. Ces dispositions permettent d'identifier la source de l'information et, dans certains cas, d'interdire la copie de documents sans permission écrite. Pour obtenir de plus amples renseignements : http://lois.justice.gc.ca/fr/showtdm/cs/C-42 CONDITION ASSESSMENT OF CONCRETE IN HYDRAULIC STRUCTURES BY SURFACE WAVE NON-DESTRUCTIVE TESTING

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“…Each parameter to be inverted is specified to lie within a particular range with upper and lower bounds. Theoretical dispersion curves are computed using the Knopoff method (Knopoff, 1964;Schwab and Knopoff, 1972). Starting from the largest period, the theoretical group velocity is computed and compared with the observed value.…”

Section: Inversionmentioning

confidence: 99%

Rayleigh wave group velocity tomography in the Aegean area

et al. 2002

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Data from a large-scale experiment which took place in Greece during the period January -July 1997 have been used to investigate the structure of the Aegean area using surface waves. During this experiment, 30 seismic broadband instruments were deployed throughout the whole Greek area. Additional data during the period 1996 -2000 from other temporary networks have been included in the dataset. One hundred eighty-five events with magnitudes 4.0 V M w V 5.5 recorded by these stations have been collected and processed. The individual dispersion curves of the group velocity of Rayleigh waves for each source-station path have been calculated, producing more than 700 paths covering the studied region. These curves have been used to determine Rayleigh group velocity maps using a 2D-tomography method. On the basis of a regionalization of the dispersion measurements, local averaged dispersion curves have been obtained and non-linearly inverted to obtain models of shear-wave velocity versus depth. Since the dispersion curves in the period range 5 s V T V 30 s are mostly affected by the crustal structure, the model velocities are estimated down to a depth of approximately 35 -45 km. The results from the non-linear Hedhehog inversion as applied to a few local dispersion curves show a crustal thickness of approximately 32 km for the Northern Aegean Sea, and a relatively thin crust of approximately 22 -24 km for the Southern Aegean Sea. D

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Fast Surface Wave and Free Mode Computations

Cited by 208 publications

References 22 publications

A new finite‐frequency shear‐velocity model of the European‐Mediterranean region

A new finite‐frequency shear‐velocity model of the European‐Mediterranean region

Condition assessment of concrete in hydraulic structures by surface wave non-destructive testing

Rayleigh wave group velocity tomography in the Aegean area

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