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

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

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.3553s&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 18, p. 3553-3556

Mathematics

Probability

2

Geodesy And Gravity: Terrestrial Reference Systems

Scientific paper

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 (Mw>=8.0) earthquakes within the same uncertainty. The probability of the coincidence by happenings is as quite low as 2×10-5.

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