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Detection of excitations of free core nutation of the Earth and their concurrence with huge earthquakes
Author(s) -
Shirai Toshimichi,
Fukushima Toshio
Publication year - 2001
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2000gl012479
Subject(s) - very long baseline interferometry , nutation , core (optical fiber) , seismology , geology , hiss , geodesy , physics , interferometry , earth (classical element) , geophysics , astronomy , nuclear physics , optics , electron
We detected the excitations of Free Core Nutation (FCN) of the Earth directly from the analysis of the Very Long Baseline Interferometry (VLBI) observation for the period 1979.9–2000.1. During the period, the FCN had 4 significant excitations at 1989.90, 1994.47, 1994.76, and 1998.99 where the timing uncertainty is 0.40 year. These epochs coincide with the occurrence of 4 of 5 huge ( M w ≥8.0) earthquakes within the same uncertainty. The probability of the coincidence by happenings is as quite low as 2 × 10 −5 .