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Physics of the Earth and Planetary Interiors.
Core–mantle boundary – Wikipedia
Retrieved 30 August The following other wikis use this file: Schematic section through the Earth: Summary [ edit ] Description Slice earth. This page was last edited on 9 Aprilat East—west asymmetry in inner-core growth and magnetic field generation.
Retrieved from ” https: Earth cutaways SVG geology. 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. View of inner parts of earth. Physical Geology Grade Book.
Inner core – Wikipedia
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. Structure of the Earth.
There is an East—West asymmetry in the inner core seismological data. S waves shear material, and cannot transmit through liquids, so it is thought that the unit above the discontinuity is solid, while the unit discohtinuidad is in a liquid or molten form.
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.
Based on the relative prevalence of various chemical elements in the Solar Systemthe theory of planetary formationand constraints imposed or implied by the chemistry of the rest of the Earth’s volume, the inner core is believed to consist primarily of a nickel-iron alloy.
Views Read Edit View history. It was even suggested that Earth’s inner core might be a single crystal of iron.
File:Slice earth ES.svg
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Discontinuidad de Lehmann D: Impacts of the Post Perovskite Phase”.
The innermost part of the Earth, a solid ball of iron-nickel alloy. Earth’s eccentric magnetic field”. Dziewonski and Gilbert established that measurements of normal modes discontinuifad vibration of Earth caused by large earthquakes were consistent with a liquid outer core.
Karato proposed that changes in the magnetic field might also deform the inner core slowly over time.
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.