Jean-Louis Veinante

Institut de physique du globe de Paris

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M. Sapin

Centre National de la Recherche Scientifique

A. Hirn

Institut de physique du globe de Paris

Jordi Díaz

Geociencias Barcelona

J. Girardeau

Laboratoire de Planétologie et Géosciences

J. Mercier

La Rochelle Université

Alfred Hirn

Institut de physique du globe de Paris

Daniel Brefort

Institut de physique du globe de Paris

Gilles J. Dubuisson

École Normale Supérieure - PSL

J. Malod

Institut Universitaire Européen de la Mer

Marc Souriau

Observatoire Midi-Pyrénées

Cooperative Institutions

Institut de physique du globe de Paris

Centre National de la Recherche Scientifique

Université Paris Cité

Sorbonne Université

Sorbonne Paris Cité

Laboratoire de Planétologie et Géosciences

Nantes Université

Laboratoire de Physique de l'ENS

Laboratoire d’Océanographie de Villefranche

Consejo Superior de Investigaciones Científicas

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Variation of Shear-wave Residuals and Splitting Parameters from Array Observations in Southern Tibet

Pure and Applied Geophysics (1998)

A. Hirn Jordi Díaz M. Sapin Jean-Louis Veinante

Shear wave splitting

Seismometer

Shear waves

Seismic anisotropy

10.1007/s000240050120

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Citations (14)

Multiple Variscan nappes in Limousin, western Massif Central, France: geophysical constraints to the geological model and geodynamic implications

Tectonophysics (1988)

Gilles J. Dubuisson A. Hirn J. Girardeau J. Mercier Jean-Louis Veinante

Massif

10.1016/0040-1951(88)90145-x

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Citations (17)

Variation of Shear-wave Residuals and Splitting Parameters from Array Observations in Southern Tibet

Birkhäuser Basel eBooks (1998)

Alfred Hirn Jordi Díaz M. Sapin Jean-Louis Veinante

A tight array of seismographs spanning a 500 km traverse of southern Tibet resolved anisotropy from SKS with a spatial variation of its direction and an increase northward of the splitting delay, as well as of its first arrival residual. Both waves split by velocity anisotropy are slow relative to P and their waveform analysis may be interpreted to suggest attenuation anisotropy. The array here provides examples of residuals and splitting of other S waves which do not tightly conform to the anisotropy assumed in the simplest model of olivine of transverse isotropy with horizontal symmetry axis. S waves are also split, with parameters which vary along the array, and hence are relevant to near-receiver structure like those of SKS. Their splitting delay, for non-vertical incidence and polarization, appears larger than that for SKS. Residuals of S-wave first arrivals and splitting delays increase less northwards for S than SKS. Anisotropy with a slow vertical axis may account for these observations. Its origin may be related to horizontal shear or flow in low-velocity layers.

Shear wave splitting

Seismometer

Shear waves

Seismic anisotropy

10.1007/978-3-0348-8777-9_9

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Citations (1)

Three adaptive filters for the detection of body waves, with application to deep seismic soundings

Bulletin of the Seismological Society of America (1975)

Marc Souriau Jean-Louis Veinante

Abstract This paper deals with the sequential adaptive filtering of body waves based on a systematic analysis of correlations (covariances) between available digital data of deep seismic soundings. The initial step is to develop a fast algorithm for computing the covariance. We show how a simple recursive filter is well-fitted. First, a deconvolution filter based on the prediction error is developed; for ease in computation, it is derived from a one-point analysis. Second, we use a polarization filter defined by Flinn (1965). Through a theoretical analysis of the seismic field, we show how the filter is biased when it is applied to rectilinear signals in a nonisotropic noise, and we justify an empirical adjustment. Third, an original filter is based on the permanent analysis of space correlations between seismic stations, inside an arbitrary discrete fan of apparent velocities. Applied to three contiguous tracks with arbitrary spacings, the filter is able to enhance any phenomenon with a variable velocity so long as that velocity is included inside the fan. By spectral analysis, space aliasing and velocity resolution are specified, and capabilities of other procedures are revised. The three filters are applied to the same experimental data in order to estimate their relative efficiency.

Aliasing

10.1785/bssa0650040995

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Citations (2)

The Kerguelen Isles (southern Indian Ocean): new results on deep structure from refraction profiles

Tectonophysics (1990)

Maurice Recq Daniel Brefort J. Malod Jean-Louis Veinante

Mantle plume

Archipelago

10.1016/0040-1951(90)90165-5

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Citations (51)