The Earth's Inner Core

  title={The Earth's Inner Core},
  author={J. A. Jacobs},
ALL seismic work indicates that at least part of the core of the earth is liquid, since no transverse waves have ever been observed to pass through it. It has been suggested, however, that the core contains an inner core beginning at a depth of approximately 5,000 km. which is solid, although no definite proof of this has ever been given. Bullen1, however, has shown that the rise in velocity of longitudinal waves at this depth can be explained by assuming it to be solid and of the same… Expand
Hemispherical transition of seismic attenuation at the top of the earth's inner core
In contrast to the liquid outer core, the earth's inner core is mostly solid, and its composition is more pure iron. Based on dynamic arguments related to the freezing process of the inner core, andExpand
The Earth's deep interior
The deep interior of the Earth is inaccessible to man and in some ways we know less about it t h an we do about the distant stars. However seismology has revealed certain details of the earth'sExpand
Structure of the Earth's inner core
Jacobs1 proposed that the Earth's inner core is growing through the freezing of outer-core material as the Earth gradually cools2. Recent studies have shown that compositional effects associated withExpand
Fine-scale heterogeneity in the Earth's inner core
Observations of seismic waves scattered in the inner core which follow the expected arrival time of the body-wave reflection from the inner-core boundary are presented. Expand
Seismological evidence for mosaic structure of the surface of the Earth's inner core
Here the authors analyse properties of waves precritically reflected from the Earth's inner core (PKiKP phases) that show significant variability in amplitude, consistent high-frequency content and stable travel times with respect to a standard Earth model and infer that the data are best explained by a mosaic structure of the inner core's surface. Expand
Localized Temporal Change of the Earth's Inner Core Boundary
  • L. Wen
  • Medicine, Geography
  • Science
  • 2006
Compressional waves of an earthquake doublet (two events occurring in the South Sandwich Islands on 1 December 1993 and 6 September 2003), recorded at three seismic stations in Russia and KyrgyzstanExpand
Models of the Earth's Core
Combined inferences from seismology, high-pressure experiment and theory, geomagnetism, fluid dynamics, and current views of terrestrial planetary evolution lead to models of the earth's core withExpand
Temperature Distribution within the Earth's Core
RECENTLY, Simon1 has presented a method of estimating the melting-point temperature of iron at high pressure. This is of considerable geophysical interest as it is frequently argued that the earth'sExpand
Structure and dynamics of Earth's inner core
Abstract The seismological exploration of the Earth's inner core has revealed unexpected and puzzling structural complexities. Its elastic anisotropy is now well established, and has been shown toExpand
1.19 – Deep Earth Structure – The Earth’s Cores
The Earth’s core is made of a fluid outer core, with radius 3480 km, and a solid inner core, with radius ∼1220 km, which results from the solidification of the liquid core during the cooling of theExpand


Significance of radioactivity in geophysics ‐ Thermal history of the Earth
It appears that the effects on the Earth's thermal history of the exponential decay of the sources of atomic (radioactive) heat within the Earth are such that the upper crust of the Earth was heatingExpand
Elasticity and constitution of the Earth's interior
The observed variation of the seismic velocities with depth, below the crust, is examined with reference to the variation to be expected in a homogeneous medium. A general equation is derived for theExpand
A method of estimating the melting‐point gradient in the Earth's mantle
Using the Einstein-Debye theory of solids and Lindemann's theory of fusion, the ratio of the melting point at various depths in the mantle to that at depth 100 km is computed from seismic data. It isExpand
On the Condensation of the Planets