On the Presence of Liquid in Earth's Inner Core-Reference-Cited by-同舟云学术

On the Presence of Liquid in Earth's Inner Core

Published:2000-03-31 Issue:5462 Volume:287 Page:2471-2474
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Singh S. C.¹²,Taylor M. A. J.²,Montagner J. P.¹

Affiliation:

1. Départment de Sismologie, Institut de Physique du Globe de Paris, 4 Place Jussieu–75252, Paris Cédex 05, France.

2. Bullard Laboratories, University of Cambridge, Cambridge, CB3 0EZ, UK.

Abstract

Seismological studies indicate that the inner core of Earth is anisotropic for compressional waves ( P waves), and has low shear wave ( S wave) velocity, and high seismic attenuation. Using an effective medium theory for composite materials, we show that the presence of a volume fraction of 3 to 10% liquid in the form of oblate spheroidal inclusions aligned in the equatorial plane between iron crystals is sufficient to explain the aforementioned seismic phenomena. Variation of S -wave velocity between the polar axis and equatorial plane is more sensitive to the addition of liquid than that of P waves. The liquid could arise from the presence of dendrites or a mixture of elements other than iron that exist in liquid form under inner-core conditions.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference46 articles.

1. H. Jeffreys The Earth (Cambridge Univ. Press New York 1929) p. 265.

2. Lehmann I., Bur. Central Seismol. Int. Ser. A 14, 3 (1936).

3. Bullen K. E., Ann. Geofis. 6, 1 (1953).

4. Solidity of the Inner Core of the Earth inferred from Normal Mode Observations

5. PKJKP

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