Did Huge Earthquake Excite Free Core Nutation?
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Accession number;01A0565414
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| Title;Did Huge Earthquake Excite Free Core Nutation? |
| Author;
SHIRAI T
(Univ. Tokyo, Tokyo, Jpn)
FUKUSHIMA T
(National Astronomical Observatory, Tokyo, Jpn)
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Journal Title;Journal of the Geodetic Society of Japan
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Journal Code:G0199A
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ISSN:0038-0830
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VOL.47;NO.1;PAGE.198-203(2001)
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| Figure&Table&Reference; |
| Pub. Country;Japan |
| Language;English |
| Abstract;We detected the Free Core Nutation(FCN) directly and revealed the time variation of FCN from the analysis of the Very Long Baseline Interferometry(VLBI) observation for the period 1979.9-2000.1. We developed the model of the FCN which consider both the energy dissipation due to the viscosity of fluid core and the magnetic coupling of core-mantle boundary and the excitations during the observation period. From the analysis of VLBI data, we discovered that the FCN in of the damped oscillation which had 4 significant excitations at 1989.90.+-.0.40, 1994.47.+-.0.40, 1994.76.+-.0.40, and 1998.99.+-.0.40. And then these epochs roughly coincide with the occurrence of some huge earthquakes, namely whose amplitude are bigger than Mw8.0. (author abst.) |
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