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A seismic discontinuity occurs within Earth’s interior at a depth of about 2, km 1, mi below the surface, where there is an abrupt change in the speed of seismic waves generated by earthquakes or explosions that travel through Earth.
The basics of earth science. Views Read Edit View history. This page was last edited on 14 Julyat Physics of the Earth and Planetary Interiors. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong. Based on rates of cooling of the core, it is estimated that the current solid inner core started solidifying approximately 0.
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There is an East—West asymmetry in the inner core seismological data. Impacts of the Post Perovskite Phase”. The core—mantle boundary CMB in the parlance of solid earth geophysicists of the Earth lies between the planet’s silicate mantle and its liquid iron – nickel outer core.
Schematische doorsnede van de aarde continentale korst oceanische korst bovenmantel buitenmantel ondermantel binnenmantel buitenkern bovenkern binnenkern A: Melt at the Lithosphere-Asthenosphere Boundary”. Conrad continental crust Gutenberg upper mantle Lehmann upper mantle.
The innermost part of the Earth, a solid ball of iron-nickel alloy. This page was last edited on 11 Decemberat Dziewonski and Gilbert established that measurements of normal modes of vibration of Earth caused by large earthquakes were consistent with a liquid outer core.
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.
Dscontinuidad of Statistical Mechanics: This variation is surprising, since lateral temperature variations along the inner-core boundary are known to be extremely small this conclusion is confidently constrained by magnetic field observations. This may lead to enhanced magnetic field generation in the crystallizing hemisphere, creating the asymmetry in the Earth’s magnetic field. Retrieved 30 August Growth of the inner core is thought to play an important role in the generation of Earth’s magnetic field by dynamo action in the liquid outer core.
Based on the relative prevalence of various chemical lehamnn in the Solar Systemthe theory of planetary formationand constraints imposed or implied by the chemistry of the rest of the Earth’s discontinuidav, the inner core is believed to consist primarily of a nickel-iron alloy. Views View Edit History.
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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. Views Read Edit View history. This media file is uncategorized. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. Physical Geology Grade Book. Width pt Height pt.
Retrieved from ” https: Structure of the Earth. 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.
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 discontinuiddad molten outer core. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
View more global usage of this file. There is a model which explains this by differences at the surface of the inner core — melting in one hemisphere and crystallization in the other.
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. His system was to label each layer alphabetically, A through G, with the crust as ‘A’ and the inner core as ‘G’. From Wikimedia Commons, the free media repository.
From Wikipedia, the free encyclopedia. Earth and Planetary Science Letters. 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. Retrieved from ” https: Summary [ edit ] Description Slice earth. 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.
Robert E Krebs Discontinuity where the bottom of the planet’s mantle meets the outer layer of the core. The following other wikis use this file: The following other wikis use this file: