Observation of converted Moho reflections in the north-west of the Iberian Peninsula

Téllez, Júlia; Córdoba, Diego

doi:10.1111/j.1365-246x.1996.tb06348.x

Cited by 4 publications

(3 citation statements)

References 19 publications

(13 reference statements)

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“…Among them are the works of TE´LLEZ and CO´RDOBA (1996), PINO and HELMBERGER (1997), VIDAL et al (1998) and GONZA´LEZ et al (1999a, 1999b and the studies of the seismic anisotropy beneath the Iberian Peninsula developed by PLOMEROVA´(1997) and DIAZ et al (1998). A 3-D gravimetric crustal model for the northeastern region of the Iberian Peninsula has been obtained by SURIÑ ACH and CHAVE´Z (1996).…”

Section: Introductionmentioning

confidence: 99%

Elastic-anelastic Regional Structures for the Iberian Peninsula Obtained from a Rayleigh Wave Tomography and a Causal Uncoupled Inversion

Martínez

Lana

Caselles

et al. 2005

Pure appl. geophys.

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The elastic and anelastic structure of the lithosphere and asthenosphere of the Iberian Peninsula is derived by means of tomographic techniques applied to local phase and group velocities and local attenuation coefficients of Rayleigh wave fundamental mode. The database consists of surface wavetrains recorded at the broadband stations located in the Iberian Peninsula on the occasion of the ILIHA project. Path-averaged phase and group velocities and attenuation coefficients were previously obtained by standard filtering techniques of surface wavetrains and, subsequently, local dispersion curves were computed according to the Yanovskaya-Ditmar formulation. First, a principal component analysis (PCA) and the average linkage (AL) clustering algorithm are applied to these local values in order to classify the Iberian Peninsula in several rather homogeneous domains from the viewpoint of the similarity of the corresponding local dispersion curves, without previous seismotectonic constraints. Second, averaged phase and group velocities and attenuation coefficients representing each homogeneous region are used to derive the respective elastic and anelastic models of the lithosphere and asthenosphere. This purpose is achieved by using the uncoupled causal inversion of phase and group velocities and attenuation coefficients. The main features of the homogeneous regions are discussed by taking as reference the Hercynic, Alpine and Neogene domains of the Iberian Peninsula, and two questions affecting the reliability of the elastic-anelastic models are revised. First, the coherence of the shear-velocity and Q À1 b models obtained by causal uncoupled inversion for each region is analysed. Second, the influence of the causal phase and group velocities on the shear-velocity models is evaluated by comparing elastic and anelastic models derived from causal uncoupled inversion with those deduced from non-causal inversion.

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Section: Introductionmentioning

confidence: 99%

Elastic-anelastic Regional Structures for the Iberian Peninsula Obtained from a Rayleigh Wave Tomography and a Causal Uncoupled Inversion

Martínez

Lana

Caselles

et al. 2005

Pure appl. geophys.

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“…Investigations of velocity transitions at the Moho and at various depths in the mantle are an active area of research in seismology (Neves et al . 1996; Tellez & Cordoba 1996). There is never an assumption in such studies that they can help model the detailed structure at any depth.…”

Section: Introductionmentioning

confidence: 99%

“…Forward solutions for analytical pro¢les of velocity transitions are relevant to the study of transition zones at various depths in the Earth. Investigations of velocity transitions at the Moho and at various depths in the mantle are an active area of research in seismology (Neves et al 1996;Tellez & Cordoba 1996). There is never an assumption in such studies that they can help model the detailed structure at any depth.…”

Section: Introductionmentioning

confidence: 99%

P-SV coupling in inhomogeneous elastic media of Epstein type

Rao

1999

Geophysical Journal International

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Summary The coupled wave equations for P– SV propagation in plane strain elastodynamics for inhomogeneous media may be cast in two forms. In the vectorial displacement formulation, the terms containing logarithmic derivatives of inhomogeneity occur explicitly, while in the tensorial stress formulation they are implicit. The displacement formulation is convenient for studying the significance of the logarithmic derivative terms in P–SV coupling and mode conversion. Analytical solutions are obtained for the class of media characterized by the Epstein profiles. The results from the full system of coupled wave equations in the displacement formulation are compared with those from two approximate systems obtained by dropping terms associated with the logarithmic derivative. It is found that the reflection–transmission coefficients from the approximate systems do not satisfy the energy balance equation for subcritical angles of incidence. However, the approximate systems retain the general qualitative features of P–SV propagation given by the full system. The asymmetric waveguide profile displays certain unique features in the vicinity of the velocity minimum for grazing angles of incidence. This is confirmed by comparing the solutions for the full coupled system in the vectorial displacement formulation with the solutions for the coupled system in the tensorial stress formulation.

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EUNAseis: A seismic model for Moho and crustal structure in Europe, Greenland, and the North Atlantic region

2013

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Observation of converted Moho reflections in the north-west of the Iberian Peninsula

Cited by 4 publications

References 19 publications

Elastic-anelastic Regional Structures for the Iberian Peninsula Obtained from a Rayleigh Wave Tomography and a Causal Uncoupled Inversion

Elastic-anelastic Regional Structures for the Iberian Peninsula Obtained from a Rayleigh Wave Tomography and a Causal Uncoupled Inversion

P-SV coupling in inhomogeneous elastic media of Epstein type

EUNAseis: A seismic model for Moho and crustal structure in Europe, Greenland, and the North Atlantic region

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