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| Titel |
A global shear velocity model of the mantle from normal modes and surface waves |
| VerfasserIn |
Stephanie Durand, Eric Debayle, Yanick Ricard, Sophie Lambotte |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250089226
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| Publikation (Nr.) |
 EGU/EGU2014-3484.pdf |
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| Zusammenfassung |
| We present SEISGLOB1, a new global shear wave velocity model of the mantle based on the
inversion of all published normal mode, splitting and coupling coefficients, and the large
surface wave dataset measured by Debayle & Ricard (2012). Normal mode and surface wave
data are sensitive to lateral heterogeneities of elastic parameters (Vs, Vp, ξ, Ï, η) and density.
We first only consider spheroidal modes and Rayleigh waves and restrict the inversion to Vsv
(imposing an a priori correlation between Vp-Vsv and density-Vsv). Before the
inversion, we correct the data from the crust effect using 3SMAC (Nataf & Ricard
,1996). The data are inverted up to the degree 20 of spherical harmonics. Vertical
smoothing is imposed by splines and we discuss the effect of coupling/decoupling the
inverted structure above and below the ’670’ discontinuity. The obtained model
is in good agreement with existing ones and an interesting result is that the high
velocity slabs do cross the ’670’ discontinuity and are still observed down to 800km
depth whatever the parameterization is, coupled or not at the ’670’ discontinuity. |
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