Heterogeneities of the Earth’s Inner Core Boundary from Differential Measurements of PKiKP and PcP Seismic Phases

2019 ◽  
pp. 241-251
Author(s):  
Dmitry Krasnoshchekov ◽  
Vladimir Ovtchinnikov
Keyword(s):  
Inner Core ◽  
Core Boundary ◽  
Earth’S Inner Core

Measuring the melting curve of iron at super-Earth core conditions

Science ◽  
2022 ◽  
Vol 375 (6577) ◽  
pp. 202-205
Author(s):  
Richard G. Kraus ◽  
Russell J. Hemley ◽  
Suzanne J. Ali ◽  
Jonathan L. Belof ◽  
Lorin X. Benedict ◽  
...  
Keyword(s):  
Liquid Metal ◽  
Inner Core ◽  
Melting Curve ◽  
Radiation Shielding ◽  
Metal Core ◽  
Earth Core ◽  
Core Boundary ◽  
Earth Like Planets ◽  
Earth’S Inner Core ◽  
Core Conditions

Terapascal iron-melting temperature The pressure and temperature conditions at which iron melts are important for terrestrial planets because they determine the size of the liquid metal core, an important factor for understanding the potential for generating a radiation-shielding magnetic field. Kraus et al . used laser-driven shock to determine the iron-melt curve up to a pressure of 1000 gigapascals (see the Perspective by Zhang and Lin). This value is about three times that of the Earth’s inner core boundary. The authors found that the liquid metal core lasted the longest for Earth-like planets four to six times larger in mass than the Earth. —BG

scholarly journals On shear wave velocity in the top of the Earth’s inner core

2019 ◽  
Vol 488 (4) ◽  
pp. 434-438
Author(s):  
D. N. Krasnoshchekov ◽  
V. M. Ovtchinnikov ◽  
O. A. Usoltseva
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Inner Core ◽  
Solid Core ◽  
The Earth ◽  
Inner Surface ◽  
Core Boundary ◽  
Standard Models ◽  
Earth’S Inner Core

Analysis of PKIIKP waves reflected off the inner surface of the solid core boundary and recorded close to the antipode indicates the shear wave velocity in its top can be by 10-60% below 3.5 km/s envisaged by standard models of the Earth.

scholarly journals Fe Alloy Slurry and a Compacting Cumulate Pile Across Earth's Inner‐Core Boundary

2019 ◽  
Vol 124 (11) ◽  
pp. 10954-10967 ◽  
Author(s):  
Youjun Zhang ◽  
Peter Nelson ◽  
Nick Dygert ◽  
Jung‐Fu Lin
Keyword(s):  
Inner Core ◽  
Core Boundary ◽  
Earth’S Inner Core

scholarly journals A simple 3-D numerical model of thermal convection in Earth's growing inner core: on the possibility of the formation of the degree-one structure with lateral viscosity variations

2015 ◽  
Vol 7 (4) ◽  
pp. 3817-3841
Author(s):  
M. Yoshida
Keyword(s):  
Thermal Convection ◽  
Inner Core ◽  
Outer Core ◽  
Limited Range ◽  
Asymmetric Structure ◽  
Planetary Scale ◽  
Core Boundary ◽  
Earth’S Inner Core ◽  
East West ◽  
Rheological Heterogeneity

Abstract. An east-west hemispherically asymmetric structure for Earth's inner core has been suggested by various seismological evidence, but its origin is not clearly understood. Here, to investigate the possibility of an "endogenic origin" for the degree-one thermal/mechanical structure of the inner core, I performed new numerical simulations of thermal convection in the growing inner core. A setup value that controls the viscosity contrast between the inner core boundary and the interior of the inner core, ΔηT, was taken as a free parameter. Results show that the degree-one structure only appeared for a limited range of ΔηT; such a scenario may be possible but is not considered probable for the real Earth. The degree-one structure may have been realized by an "exogenous factor" due to the planetary-scale thermal coupling among the lower mantle, the outer core, and the inner core, not by an endogenic factor due to the internal rheological heterogeneity.

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