Results 41 to 50 of about 3,352 (155)
Mantle roots of the Emeishan plume: an evaluation based on teleseismic P-wave tomography [PDF]
Solid Earth, 2017 The voluminous magmatism associated with large igneous provinces (LIPs) is commonly correlated to upwelling plumes from the core–mantle boundary (CMB). Here we analyse seismic tomographic data from the Emeishan LIP in southwestern China.
C. He, M. Santosh, M. Santosh
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Modeling two‐dimensional structure at the core‐mantle boundary [PDF]
Journal of Geophysical Research: Solid Earth, 1996 Recent studies of SKS waveform modeling emphasize the strong variation of seismic properties at the core‐mantle boundary (CMB) and the need for two‐dimensional and three‐dimensional waveform modeling capabilities. In particular, the bifurcation of SKS into SP dKS and SKP dS near 110° shows strong regional variations.
Helmberger, D. V. +2 more
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Inner core static tilt inferred from intradecadal oscillation in the Earth’s rotation
Nature Communications, 2023 The presence of a static tilt between the inner core and mantle is an ongoing discussion encompassing the geodynamic state of the inner core. Here, we confirm an approximate 8.5 yr signal in polar motion is the inner core wobble (ICW), and find that the ...
Yachong An +4 more
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Seismic waveform inversion for core–mantle boundary topography [PDF]
Geophysical Journal International, 2014 ISSN:0956 ...
Colombi, Andrea +3 more
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Geodesy and Geodynamics, 2019 In response to the primary electric field originated by the fluid-core-dynamo, electric charges accumulate at the boundaries of a solid conducting D″ layer due to the poor circuitry conditions until the irrotational primary electric field is neutralized.
Ming Fang, Xinhao Liao
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Grain Boundary Diffusion of Ferropericlase: Implications for the Core‐Mantle Interaction
Geophysical Research LettersGeophysical observations indicate that iron enrichment of various spatial scales may be present in the lowermost mantle. Various mechanisms have been proposed to explain the process of iron infiltration from the core to the mantle, each with its own ...
Yihang Peng +3 more
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Density structure of Earth’s lowermost mantle from Stoneley mode splitting observations
Nature Communications, 2017 Large-low-shear-wave velocity provinces (LLSVPs) are present at the core–mantle boundary. Here, the authors show that splitting of Stoneley modes is probably due to a lower density of LLSVPs than the surrounding mantle because of the presence of post ...
Paula Koelemeijer +2 more
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DEEP-LEVEL GEODYNAMICS: BOUNDARIES OF THE PROCESS ACCORDING TO GEOCHEMIC AND PETROLOGIC DATA
Геодинамика и тектонофизика, 2015 Geochemical features for volcanic rocks and petrologic data for deep-seated inclusions, which can be used to infer mass transfer between different geospheres, are reviewed.
Alexei V. Ivanov
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Ultra‐Low Velocity Zone Beneath the Atlantic Near St. Helena
Geochemistry, Geophysics, GeosystemsThere are various hotspots in the Atlantic Ocean, which are underlain by mantle plumes that likely cross the mantle and originate at the core‐mantle boundary. We use teleseismic core‐diffracted shear waves to look for an Ultra‐Low Velocity Zone (ULVZ) at
Sefira Davison +3 more
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Superdipole Geomagnetic Field in the Past
Russian Journal of Earth SciencesAccording to the model of the Earth’s cooling, before the solid core origin, there was a sub-adiabatic layer at the core-mantle boundary several hundred kilometers thick. In this layer magnetic field generation was suppressed.
Reshetnyak Maxim
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