Smoothness criteria in surface wave tomography

Yanovskaya, T. B.; Ditmar, Pavel

doi:10.1111/j.1365-246x.1990.tb00530.x

Cited by 160 publications

(108 citation statements)

References 19 publications

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“…To construct the group velocity tomographic maps, we have applied a generalized 2D-linear inversion program developed by Ditmar and Yanovskaya (1987) and Yanovskaya and Ditmar (1990). The method of Yanovskaya and Ditmar is a generalization to two dimensions of the classical one-dimensional method of Backus and Gilbert (1968).…”

Section: Tomographic Methodsmentioning

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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Section: Tomographic Methodsmentioning

confidence: 99%

Rayleigh wave group velocity tomography in the Aegean area

et al. 2002

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“…Our data processing method is based on that discussed by Bensen et al (2007); Yang et al (2007); Ditmar and Yanovskaya (1987) and Yanovskaya and Ditmar (1990). It consists of three main steps: 1) calculation of the Green's function from seismic noise; 2) determination of the Rayleigh wave fundamental mode group velocity dispersion curves; 3) 2D group velocity tomography.…”

Section: Data Processingmentioning

confidence: 99%

“…3). Group velocity tomography for each period was carried out using the DitmarYanovskaya method (Ditmar and Yanovskaya, 1987;Yanovskaya and Ditmar, 1990). The study region extends from 15.4 E to 23 E and from 45.0 N to 49.0 N (Fig.…”

Section: Data Processingmentioning

confidence: 99%

Ambient seismic noise Rayleigh wave tomography for the Pannonian basin

2013

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We studied the Rayleigh wave group velocities beneath Hungary using ambient seismic noise tomography. Noise data were gathered from 17 broadband seismological stations in and around the Pannonian basin. The cross-correlation method was used to calculate the Green's functions. Group velocities belonging to the fundamental mode Rayleigh waves were determined by multiple filter technique. We measured the dispersion curves for each station pair in a period range of 7-28 s and computed maps of group velocity distribution using a 2D tomography method. The group velocity maps of 7-14 s periods correlate well with sedimentary thickness and regional geology. Velocity anomalies observed at longer periods reflect the e↵ect of the crustal and mantle structural features.

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“…The experimental errors of these measurements for each period range from 0.06 to 0.09 km/s and are determined as the average between the differences of group velocity values for at least 5 pair of paths, where for each pair the station is the same and the distance between the epicenters is less than 0.3°. For the tomographic analysis, the methodology described in [20][21][22] is applied to the dispersion curves and a set of seven tomographic maps for periods ranging from 10 s to 40 s at intervals of 5 s are obtained (Fig.2). The lateral resolution (a) determined by the coverage of paths is about 500 km in the Central-West Caribbean, the Antilles and the south of Central America (Fig.3); the azimuthal resolution (ε) of the traces [22] indicates, in general, an adequate spatial distribution of paths for this region (Fig.…”

Section: The Methods A) Determination Of Dispersion Curves and Tomogramentioning

confidence: 99%

Crust and Upper Mantle Structure in the Caribbean Region by Group Velocity Tomography and Regionalization

González

Álvarez

Guidarelli

et al. 2007

Pure appl. geophys.

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An overview of the crust and upper mantle structure of the Central America and Caribbean region is presented as a result of the processing of more than 200 seismograms recorded by digital broadband stations from SSSN and GSN seismic networks. By FTAN analysis of the fundamental mode of the Rayleigh waves, group velocity dispersion curves are obtained in the period range from 10 s to 40 s; the error of these measurements varies from 0.06 and 0.10 km/s. From the dispersion curves, seven tomographic maps at different periods and with average spatial resolution of 500 km are obtained. Using the logical combinatorial classification techniques, eight main groups of dispersion curves are determined from the tomographic maps and eleven main regions, each one characterized by one kind of dispersion curves, are identified. The average dispersion curves obtained for each region are extended to 150 s by adding data from the tomographic study of [3] and inverted using a non-linear procedure. As a result of the inversion process, a set of models of the Swave velocity vs. depth in the crust and upper mantle are found. In six regions, we identify a typically oceanic crust and upper mantle structure, while in the other two the models are consistent with the presence of a continental structure. Two regions, located over the major geological zones of the accretionary crust of the Caribbean region, are characterized by a peculiar crust and upper mantle structure, indicating the presence of lithospheric roots reaching, at least, about 200 km of depth.2

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Smoothness criteria in surface wave tomography

Cited by 160 publications

References 19 publications

Rayleigh wave group velocity tomography in the Aegean area

Rayleigh wave group velocity tomography in the Aegean area

Ambient seismic noise Rayleigh wave tomography for the Pannonian basin

Crust and Upper Mantle Structure in the Caribbean Region by Group Velocity Tomography and Regionalization

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