Science Links Japan | Existence of finite rigidity layer at the base of the Earth's liquid outer core inferred from anomalous splitting of normal modes.

Existence of finite rigidity layer at the base of the Earth's liquid outer core inferred from anomalous splitting of normal modes.

Accession number;02A0283563

Title;Existence of finite rigidity layer at the base of the Earth's liquid outer core inferred from anomalous splitting of normal modes.

Author; TSUBOI S (Yokohama City Univ., Yokohama, Jpn) SAITO M (Yokohama City Univ., Yokohama, Jpn)

Journal Title;Earth, Planets Space

Journal Code:G0106B

ISSN:1343-8832

VOL.54;NO.2;PAGE.167-171(2002)

Figure&Table&Reference;FIG.4, REF.21

Pub. Country;Japan

Language;English

Abstract;We calculate normal modes for the Earth model, which has a slight rigidity layer at the base of the liquid outer core. We show that such a layer with thickness about 40 km and the shear wave velocity of 0.017 km/sec can produce a normal mode, which has a close eigenfrequency to that of liquid core model, without affecting fundamental modes and most of the higher modes. Our results indicate that the thin finite rigidity layer at the base of the outer core might explain the anomalous splitting of the Earth's normal modes, which has not been fully explained by the anisotropy in the inner core. (author abst.)

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