The Structure of the Upper Mantle under the United States from the Dispersion of Rayleigh Waves

Biswas, N. N.; Knopoff, L.

doi:10.1111/j.1365-246x.1974.tb00612.x

Cited by 115 publications

(72 citation statements)

References 31 publications

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“…12 and 13 were inverted to obtain Swave velocity versus depth models. The method of inversion used here is known as the Hedgehog method (Keilis-Borok and Yanovskaya, 1967;Press, 1968Press, , 1969Knopoff, 1972;Biswas and Knopoff, 1974;Calcagnile and Panza, 1980;Panza 1980). The Earth model is parameterized by density and P-and S-wave velocities, as a function of depth.…”

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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Section: Inversionmentioning

confidence: 99%

Rayleigh wave group velocity tomography in the Aegean area

et al. 2002

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“…Love and Rayleigh wave phase velocities are incompatuible, in the sense defined by , for almos the entire common frequency range' (Figures 6 and 7). Also as noted by comparatively lower than other reported measurements in the western United States (Biswas and Knopoff, 1974). This may be a real effect, however; the contour map of P velocity in the western United States (Archambeau et al, 1969) shows that the path between LON and TUC lies in a low Pn velocity 'valley'.…”

Section: Discussionmentioning

confidence: 51%

Research in Seismology

Toksoz¹,

Aki²,

Solomon³

1978

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“…For each structural model, group velocity curves are computed and if, at each period, the difference between the computed and the experimental values is less than the measurement error, and if the r.m.s. value of the differences is less than a chosen fraction (usually about 60%) of the average single point experimental error, ρ g , the model is accepted [26,27]. The inverted parameters are the thickness of five layers and their Vs velocities (Table 3), with Vp/Vs = √3.…”

Section: B) Regionalization Analysis Of Tomography Resultsmentioning

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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The Structure of the Upper Mantle under the United States from the Dispersion of Rayleigh Waves

Cited by 115 publications

References 31 publications

Rayleigh wave group velocity tomography in the Aegean area

Rayleigh wave group velocity tomography in the Aegean area

Research in Seismology

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

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