Detection of excitations of Free Core Nutation of the Earth and their concurrence with huge earthquakes

Citation
T. Shirai et T. Fukushima, Detection of excitations of Free Core Nutation of the Earth and their concurrence with huge earthquakes, GEOPHYS R L, 28(18), 2001, pp. 3553-3556
Citations number
18
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Earth Sciences
Journal title
GEOPHYSICAL RESEARCH LETTERS
ISSN journal
0094-8276 → ACNP
Volume
28
Issue
18
Year of publication
2001
Pages
3553 - 3556
Database
ISI
SICI code
0094-8276(20010915)28:18<3553:DOEOFC>2.0.ZU;2-I
Abstract
We detected the excitations of Free Core Nutation (FCN) of the Earth direct ly from the analysis of the Very Long Baseline Interferometry (VLBI) observ ation for the period 1979.9-2000.1. During the period, the FCN had 4 signif icant excitations at 1989.90, 1994.47, 1994.76, and 1998.99 where the timin g uncertainty is 0.40 year. These epochs coincide with the occurrence of 4 of 5 huge (Mw greater than or equal to 8.0) earthquakes within the same unc ertainty. The probability of the coincidence by happenings is as quite low as 2 x 10(-5).