Study of extensometric measurements in non tidal frequency domain at the Russian and Slovak stations

Ladislav BRIMICH; Lyudmila Alexandrovna LATYNINA; Igor KOHÚT

Ladislav BRIMICH Geophysical Institute of the Slovak Academy of Sciences, , Dúbravská cesta 9, 845 28 Bratislava, Slovak Republic
Lyudmila Alexandrovna LATYNINA Schmidt Institute of the Earth Physics, Russian Academy of Sciences
Igor KOHÚT Geophysical Institute of the Slovak Academy of Sciences, , Dúbravská cesta 9, 845 28 Bratislava, Slovak Republic

Keywords: Earth's crust, Sumatra-Andaman earthquake, deformations, correlation, extensometric stations, synchronous variations

Abstract

The study of the Earth's crust deformations caused by the Sumatra-Andaman earthquake (26^th December, 2004) at large distances from its focal point is the main subject of the paper. The extensometric measurements at stations Protvino (Podmoskovie area) and Baksan (Caucasus) reveal the concordant pattern. A comparative analysis of the measured data for the Protvino and Vyhne (Western Carpathians) was performed for the same time period. The correlation of the observations within three months before the earthquake is quite low. The substantial correlation was observed for the time span of the earthquake and for the following two months. Consequently, the Sumatra-Andaman earthquake manifested itself at the distant points by increasing mobility of the Earth's crust. The mechanisms of this coupling are outlined.