Joint interpretation of upper-mantle anisotropy based on teleseismic P-travel time delays and inversion of shear-wave splitting parameters

Plomerová, J.; Šı́lený, Jan; Babuška, Vladislav

doi:10.1016/0031-9201(95)03122-7

Cited by 65 publications

(53 citation statements)

References 38 publications

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“…To retrieve a general 3-D orientation of anisotropic structures and lateral variations of seismic velocities within the subcrustal lithosphere, we applied a method of joint interpretation of upper mantle anisotropy based on an analysis of teleismic P and PKP travel-time residuals, and inversion of shear-wave splitting parameters PLOMEROVÁ et al, 1996).…”

Section: Methodsmentioning

confidence: 99%

Seismic Anisotropy and Velocity Variations in the Mantle beneath the Saxothuringicum-Moldanubicum Contact in Central Europe

Plomerová

Babuška

Šı́lený

et al. 1998

Pure appl. geophys.

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We report on results of a passive seismic experiment undertaken to study the 3-D velocity structure and anisotropy of the upper mantle around the contact zone of the Saxothuringicum and Moldanubicum in the western margin of the Bohemian Massif in central Europe. Spatial variations of P-wave velocities and lateral variations of the particle motion of split shear waves over the region monitor changes of structure and anisotropy within the deep lithosphere and the asthenosphere. A joint interpretation of P-residual spheres and shear-wave splitting results in an anisotropic model of the lithosphere with high velocities plunging divergently from the contact of both tectonic units. Lateral variations of the mean residuals are related to a southward thickening of the lithosphere beneath the Moldanubicum.

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Section: Methodsmentioning

confidence: 99%

Seismic Anisotropy and Velocity Variations in the Mantle beneath the Saxothuringicum-Moldanubicum Contact in Central Europe

Plomerová

Babuška

Šı́lený

et al. 1998

Pure appl. geophys.

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“…Early work on the inversion of shear wave splitting parameters, in combination with P wave travel time residuals, was done by Síleney and Plomerová (1996) and Plomerová et al (1996), who inverted data from the western US and Fennoscandia for a set of parameters that describe a homogeneous anisotropic media with a dipping axis of either hexagonal or orthorhombic symmetry. These early studies solved for a homogenous anisotropic structure at depth, but the availability of dense array data is beginning to allow for the development of techniques to solve for laterally and vertically heterogeneous anisotropy at depth using tomographic methods.…”

Section: Inverse Modeling: Shear Wave Splitting Tomographymentioning

confidence: 99%

“…There has been some theoretical progress on how to relate shear wave splitting to P wave traveltime residuals (e.g., Plomerová et al 1996;Schulte-Pelkum and Blackman 2003) and to surface wave observations (e.g. Montagner et al 2000).…”

Section: Integration With Other Seismological Constraintsmentioning

confidence: 99%

Shear Wave Splitting and Mantle Anisotropy: Measurements, Interpretations, and New Directions

2009

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Measurements of the splitting or birefringence of seismic shear waves that have passed through the Earth's mantle yield constraints on the strength and geometry of elastic anisotropy in various regions, including the upper mantle, the transition zone, and the D 00 layer. In turn, information about the occurrence and character of seismic anisotropy allows us to make inferences about the style and geometry of mantle flow because anisotropy is a direct consequence of deformational processes. While shear wave splitting is an unambiguous indicator of anisotropy, the fact that it is typically a near-vertical path-integrated measurement means that splitting measurements generally lack depth resolution. Because shear wave splitting yields some of the most direct constraints we have on mantle flow, however, understanding how to make and interpret splitting measurements correctly and how to relate them properly to mantle flow is of paramount importance to the study of mantle dynamics. In this paper, we review the state of the art and recent developments in the measurement and interpretation of shear wave splitting-including new measurement methodologies and forward and inverse modeling techniques,-provide an overview of data sets from different tectonic settings, show how they help us relate mantle flow to surface tectonics, and discuss new directions that should help to advance the shear wave splitting field.

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“…At We seek to interpret the observed SKS wave splitting in the simplest way, namely as being due to the Lattice Preferred Orientation (LPO) of olivine crystals in a single, upper mantle layer, with hexagonal symmetry and horizontal fast axis. With the data we retrieved, we cannot investigate more complex anisotropic models with dipping axes and/or orthorhombic symmetry which might account for dependence of S and SKS polarization parameters on back azimuths and/or incidence (e.g., Plomerova et al, 1996). Similarly our short term station deployment precludes observation of possible •r/2 periodicity of (•, •St) as a function of back azimuth resulting from two layer anisotropy.…”

Section: Introductionmentioning

confidence: 99%

Teleseismic Shear wave splitting and lithospheric anisotropy beneath and across the Altyn Tagh Fault

Herquel¹,

Tapponnier²,

Wittlinger³

et al. 1999

Geophysical Research Letters

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Joint interpretation of upper-mantle anisotropy based on teleseismic P-travel time delays and inversion of shear-wave splitting parameters

Cited by 65 publications

References 38 publications

Seismic Anisotropy and Velocity Variations in the Mantle beneath the Saxothuringicum-Moldanubicum Contact in Central Europe

Seismic Anisotropy and Velocity Variations in the Mantle beneath the Saxothuringicum-Moldanubicum Contact in Central Europe

Shear Wave Splitting and Mantle Anisotropy: Measurements, Interpretations, and New Directions

Teleseismic Shear wave splitting and lithospheric anisotropy beneath and across the Altyn Tagh Fault

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