DISCONTINUIDAD DE LEHMANN PDF

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Schematic discontinuifad through the Earth: Physics of the Earth and Planetary Interiors. Speculation also continues that the inner core might have exhibited a variety of internal deformation patterns.

P-wave velocities are much slower in the outer core than in the deep mantle while S-waves do not exist at all in the liquid portion of the core. This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it.

Seismic tomography studies have shown significant irregularities within the boundary zone and appear to be dominated by the African and Pacific large low-shear-velocity provinces LLSVPs.

By using this site, you agree to the Terms of Discontunuidad and Privacy Policy. East—west asymmetry in inner-core growth and magnetic field generation.

Archived from the original on View more global usage of this file. Description Slice earth ES.

Core–mantle boundary – Wikipedia

This page was last edited on 28 Decemberat Physical Geology Grade Book. This page was last edited on 11 Decemberat Journal of Geophysical Research: This occurs mostly because it cannot dissolve the same amount of light elements as the outer core and therefore freezing at the inner core boundary produces a residual liquid that contains more light elements than the overlying liquid.

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From Wikimedia Commons, the free media repository. Further, if the primordial and mostly fluid still forming earth contained any significant mass es of elements denser than iron and nickel, namely the white appearance precious metals and a few others except silver, specifically the siderophile elementsthen these would necessarily have differentiated to the very center of the core into concentric nested spheres by planetary differentiationwith the most dense and stablei.

Archivo:Slice earth.svg

Width pt Height pt. Karato proposed that changes in the magnetic field might also deform the inner core slowly over time.

This may discontinuidxd to enhanced magnetic field generation in the crystallizing hemisphere, creating the asymmetry in the Earth’s magnetic field. The Earth was discovered to have a solid inner core distinct from its molten outer core inby the Danish seismologist Inge Lehmann[4] who deduced its presence by studying seismograms from earthquakes in New Zealand. This boundary is known as the Bullen discontinuity, [5] or sometimes as the Lehmann discontinuity. Retrieved from ” https: Impacts of the Post Perovskite Phase”.

Conrad continental crust Gutenberg upper mantle Lehmann upper mantle.

Retrieved 30 August It was even suggested that Earth’s inner core might be a single crystal of iron. Yoshida and colleagues proposed a novel mechanism whereby deformation of the inner core can be caused by a higher rate of freezing at the equator than at polar latitudes, [26] and S.

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If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file.

Densities of the elements data page. Even though it is growing into liquid, it is solid, due to the very high pressure that keeps it compacted together even if the temperature is extremely high. From Wikimedia Commons, the free media repository.

File:Slice earth.svg

This media file is uncategorized. The boundary is observed via the discontinuity in seismic wave velocities at that depth due to the differences between the acoustic impedances of the solid mantle and the molten outer core. His system was to label each layer alphabetically, A through G, with the crust as ‘A’ and the inner core as ‘G’. This causes it to become buoyant and helps drive convection of the outer core.

The Wikibook Historical Geology has a page on the topic of: The Earth’s inner core is the Earth’s innermost part.