Observation of Luni-Solar Tides by the Long Base Laser Interferometer(VIII Asia-Pacific International Conference on Gravitation and Astrophysics (ICGA8))

概要

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Results of observations of tidal strains of the crust in the tectonically active region of the Northern Caucasus (the Elbrus mountain area) carried out with the use of the Baksan laser interferometer strainmeter over the period from 2003 through 2006 are presented. Harmonic analysis is performed with the help of the ETERNA software package. Statistically significant time variations in the amplitudes of the main tidal waves M_2 and O_1 are revealed. The influence of the Baksan canyon topography on tidal strains is estimated at 22% (an increase in the measured strain values). The reduced amplitude factors of the main diurnal O_1 and semidiurnal M_2 waves are underestimated. Numerical modeling of tidal anomalies produced by regional heterogeneous inclusions is performed in a 2-D approximation. The observed anomaly of the M_2 wave (12%) is shown to be due to the influence of the main magmacontrolling fault associated with the deep magma source of the Elbrus dormant volcano.
理論物理学刊行会の論文
2008-07-09