Melt in the mantle and seismic azimuthal anisotropy: evidence from Anatolia
نویسندگان
چکیده
منابع مشابه
Origin of azimuthal seismic anisotropy in oceanic plates and mantle
Article history: Received 13 March 2014 Received in revised form 4 June 2014 Accepted 8 June 2014 Available online xxxx Editor: Y. Ricard
متن کاملAzimuthal seismic anisotropy in the Earth’s upper mantle and the thickness of tectonic plates
S U M M A R Y Azimuthal seismic anisotropy, the dependence of seismicwave speeds on propagation azimuth, is largely due to fabrics within the Earth’s crust and mantle, produced by deformation. It thus provides constraints on the distribution and evolution of deformation within the upper mantle. Here, we present a new global, azimuthally anisotropic model of the crust, upper mantle and transitio...
متن کاملVariable azimuthal anisotropy in Earth's lowermost mantle.
A persistent reversal in the expected polarity of the initiation of vertically polarized shear waves that graze the D'' layer (the layer at the boundary between the outer core and the lower mantle of Earth) in some regions starts at the arrival time of horizontally polarized shear waves. Full waveform modeling of the split shear waves for paths beneath the Caribbean requires azimuthal anisotrop...
متن کاملMantle dynamics and seismic anisotropy
a r t i c l e i n f o Keywords: seismic anisotropy mantle flow geodynamic modeling shear wave splitting surface wave analysis mantle convection Observations of seismic anisotropy yield some of the most direct constraints available on both past and present-day deformation in the Earth's mantle. Insight into the character of mantle flow can also be gained from the geodynamical modeling of mantle ...
متن کاملMelt segregation and strain partitioning: implications for seismic anisotropy and mantle flow.
One of the principal means of understanding upper mantle dynamics involves inferring mantle flow directions from seismic anisotropy under the assumption that the seismic fast direction (olivine a axis) parallels the regional flow direction. We demonstrate that (i) the presence of melt weakens the alignment of a axes and (ii) when melt segregates and forms networks of weak shear zones, strain pa...
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ژورنال
عنوان ژورنال: Geophysical Journal International
سال: 2016
ISSN: 0956-540X,1365-246X
DOI: 10.1093/gji/ggw021