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International Journal of Mathematics and Mathematical Sciences, 1980 In the present paper the influence of the initial stress is shown on the reflection and transmission of P waves at the core-mantle boundary. Taking a particular value of the inherent initial stress, the variations of reflection and transmission ...
Sukhendu Dey, Sushil Kumar Addy
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Melting Curve and Phase Relations of Fe‐Ni Alloys: Implications for the Earth's Core Composition
Geophysical Research Letters, 2020 Nickel is the second most abundant element in the Earth's core. However, the properties of Fe‐Ni alloys are still poorly constrained under planetary cores conditions, in particular concerning the effect of Ni on the melting curve of Fe. Here we show that
R. Torchio +10 more
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Deformation-induced mechanical instabilities at the core-mantle boundary [PDF]
, 2007 Post-Perovskite: The Last Mantle Phase Transition\ud Our understanding of the core-mantle boundary (CMB) region has improved significantly over the past several years due, in part, to the discovery of the post-perovskite phase. Sesimic data suggest that the CMB region is highly heterogeneous, possibly reflecting chemical and physical interaction ...
Petford, Nick +2 more
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Influence of Grain Size Evolution on Mantle Plume and LLSVP Dynamics
Geochemistry, Geophysics, GeosystemsRecent seismic tomography models suggest large‐radius primary plumes originating from the core‐mantle boundary, with grain size variations potentially explaining these observations. Additionally, grain size variations are thought to enhance the long‐term
Yusen Liu +4 more
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On seismic-wave scattering by a rough core?mantle boundary [PDF]
Geophysical Journal International, 1978 Summary. A formulation is given for the seismic-wave scattering by a rough solid-liquid interface, in analogy to results derived for a solid-solid interface and a heterogeneous volume. Using Kennett’s approach and the reciprocity theorem, the scattering is formulated as the excitation by an equivalent dislocation. Using interface parameters relevant to
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A generating process of geomagnetic drifting field
Earth, Planets and Space, 2018 The geomagnetic field is comprised of drifting and standing fields. The drifting field has two remarkable features. One is predominance of sectorial harmonics when the field is expressed in a spherical harmonic series, and the other is uniform drift rate
Takesi Yukutake, Hisayoshi Shimizu
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FeO Content of Earth’s Liquid Core
Physical Review X, 2019 The standard model of Earth’s core evolution has the bulk composition set at formation, with slow cooling beneath a solid mantle providing power for geomagnetic field generation.
Monica Pozzo +3 more
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The Influence of ɛ‐to‐Py FeOOH Phase Transition on the Lower Mantle Heterogeneities
Geochemistry, Geophysics, GeosystemsHydrous minerals transported by cold subducting slabs to the lowermost mantle are believed to significantly influence mantle properties and the heterogeneities in the core‐mantle boundary (CMB) region.
Sparsh Sharma, Gaurav Shukla
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Geophysical Research Letters, 2016 We stack a large global data set of 1 Hz PKKP waveforms to constrain globally averaged properties of PKKP precursors. We find that the precursor observations are better explained by scattering from core‐mantle boundary (CMB) topography than by scattering
Nicholas Mancinelli, Peter Shearer
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Melting and defect transitions in FeO up to pressures of Earth's core-mantle boundary. [PDF]
Nat Commun, 2023 Dobrosavljevic VV +8 more
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