نتایج جستجو برای: asthenosphere

تعداد نتایج: 575  

Journal: :Physics of the Earth and Planetary Interiors 2021

The tectonic evolution of the southeastern Tibetan Plateau is key to understanding mechanism growth whole Plateau. Its imprint on lithospheric and asthenospheric mantle rock fabrics expected have a strong signature seismic anisotropy. In this study, we measure splitting delays fast polarization directions (FPD) with minimum-transverse-energy intensity methods using core-refracted phases (e.g., ...

Journal: :فیزیک زمین و فضا 0
فتانه تقی زاده فرهمند دانشکده علوم دانشگاه آزاد اسلامی واحد قم- استادیار فروغ صدودی مؤسسه تحقیقاتی علوم زمین هلمهولتز، پتسدام- پژوهشگر محمدرضا قیطانچی مؤسسه ژئوفیزیک دانشگاه تهران، استاد نرگس افسری دانشگاه آزاد اسلامی واحد اسلام شهر- دانشجوی دکتری

recently, the s receiver function method has been successfully developed to identify upper mantle interfaces. s receiver functions have the advantage of being free of s-wave multiple reflections and can be more suitable than p receiver function for studying mantle lithosphere. however, because of specific ray geometry of the s-to-p converted waves, the s receiver function method has some techni...

2012
Peter J. Wyllie Wuu-Liang Huang

The key to the origin of carbonatite and kimberlite lies in the system CaOMg0-Si0 2 -C0 2 . Increase in pressure causes a carbonation reaction in the peridotite assemblage as follows: forsterite + clinopyroxene + C 0 2 ^ orthopyroxene + carbonate (Ca:Mg::70:30). This reaction passes through 15 kb-960°C with slope 45 b/°C and terminates at an invariant point near 25 kb-1200°C, where melting begi...

2008
L. Petrova B. Pavlov

We suggest a method of fitting of a zero-range model of a tectonic plate under a boundary stress on the basis of comparison of the theoretical formulae for the corresponding eigenfunctions/eigenvalues with the results extraction under monitoring, in the remote zone, of non-random (regular) oscillations of the Earth with periods 0.2-6 hours, on the background seismic process, in case of low seis...

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