scholarly journals Determination of a Set of Velocity-Depth Curves for the Transition Zone of the Earth's Core from Travel Times of Successive Arrivals of PKP Waves

1972 ◽  
Vol 29 (2) ◽  
pp. 227-235 ◽  
Author(s):  
T. B. Yanovskaya
Keyword(s):  
Transition Zone ◽  
Travel Times ◽  
Earth’S Core ◽  
Earth's Core ◽  
Depth Curves

scholarly journals Wave velocities in the earth's core

1958 ◽  
Vol 48 (4) ◽  
pp. 301-314
Author(s):  
B. Gutenberg
Keyword(s):  
Travel Time ◽  
Transition Zone ◽  
Southern California ◽  
Inner Core ◽  
Travel Times ◽  
Earth’S Core ◽  
Earth's Core ◽  
The Core ◽  
Wave Velocities

Abstract More than 700 seismograms of 39 shocks recorded mainly in southern California at epicentral distances between 105 and 140 degrees are used to investigate records of phases which have penetrated the earth's core. Properties of PKIKP, SKP, SKIKP, PKS, and PKIKS are discussed. Portions of travel-time curves of these phases are revised. Travel times of waves starting and ending at the surface of the core, and wave velocities in the core, are recalculated. Between about 1,500 and 1,200 km. from the earth's center in the transition zone from the liquid outer to the probably solid inner core, waves having lengths of the order of 10 km. travel faster than longer waves. This is probably caused by a rather rapid increase in viscosity toward the earth's center in this transition zone.

scholarly journals New high-pressure phases of Fe7N3 and Fe7C3 stable at Earth's core conditions: evidences for carbon–nitrogen isomorphism in Fe-compounds

RSC Advances ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 3577-3581 ◽  
Author(s):  
Nursultan Sagatov ◽  
Pavel N. Gavryushkin ◽  
Talgat M. Inerbaev ◽  
Konstantin D. Litasov
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Ab Initio ◽  
Structure Prediction ◽  
Harmonic Approximation ◽  
Crystal Structure Prediction ◽  
Earth’S Core ◽  
Earth's Core ◽  
Core Conditions

We carried out ab initio calculations on the crystal structure prediction and determination of P–T diagrams within the quasi-harmonic approximation for Fe7N3 and Fe7C3.

Experimental determination of the electrical resistivity of iron at Earth’s core conditions

Nature ◽  
2016 ◽  
Vol 534 (7605) ◽  
pp. 95-98 ◽  
Author(s):  
Kenji Ohta ◽  
Yasuhiro Kuwayama ◽  
Kei Hirose ◽  
Katsuya Shimizu ◽  
Yasuo Ohishi
Keyword(s):  
Electrical Resistivity ◽  
Experimental Determination ◽  
Earth’S Core ◽  
Earth's Core ◽  
Core Conditions

scholarly journals Determination of surface motions of the Earth's core

1969 ◽  
Vol 74 (14) ◽  
pp. 3659-3680 ◽  
Author(s):  
R. H. Ball ◽  
Anne B. Kahle ◽  
E. H. Vestine
Keyword(s):  
Earth’S Core ◽  
Earth's Core

The earthquake P phases which penetrate the earth's core

1967 ◽  
Vol 57 (5) ◽  
pp. 875-890
Author(s):  
D. H. Shurbet
Keyword(s):  
Core Model ◽  
Travel Times ◽  
Earth’S Core ◽  
Earth's Core ◽  
Distance Range ◽  
The Core ◽  
Two Phases ◽  
Magnitude Determination

abstract Travel times of all earthquake phases which enter the core as P and emerge as P are explained in terms of a core model containing two velocity discontinuities. Amplitudes of PKIKP and PKP change little with changes in distance from the source except in the rangeΔ = 142° to Δ = 152°. In this range large amplitubes are observed which result from the simultaneous arrival of two phases as well as large amplitudes which represent the PKP1 - PKP2 caustic. Amplitudes in the caustic allow detection of events perhaps smaller than magnitude 4. In all distance ranges PKIKP and PKP are useful in magnitude determination, but added care must be taken if they are used in the distance range where amplitudes are large. Magnitudes determined from PKIKP and PKP are very consistent as are focal depths. The PKJKP phase is small if present at all.

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