The first results of unique experiments on the synchronous registration of seismic-strain oscillations of the Earth’s surface by three laser interferometers-deformographs (strainmeters) spaced 6740 km apart are presented. Two 100-meter laser interferometers at the Fryazino site (Moscow Region) and the 18-meter laser strainmeter at the observation point of Karymshina (Kamchatka Peninsula) were applied. The frequency-stabilized and thermally controlled lasers and the interferogram registration systems of compensation and modulation types providing an absolute instrumental resolution of 0.1-0.01 nm were used. The results of data analysis in sessions of synchronous operation of these instruments during 2016-2020 were obtained and discussed.
The spatial and temporal distributions of seismo-acoustic wave fields are investigated. Non-stationary parameters (direction to the sources of oscillations, their intensities and localization) have been studied and estimated. The wave field distribution in elastic solid medium is recorded by the array of strain sensitive units. Every strain detector represents the laser interferometer with base-length 1-400 m, which measures the distant difference between two points of the solid medium. In this way spatial and temporal distribution of a strains field is being evaluated. The output signals of every laser sensors supplies the consequent inputs of multi-channel analog-to-digital converter and the obtained data are stored and subjected to the processing in the PC. The procedure of numerical treatment is based on the Fourier spectral analysis, which results to the tracks of non-stationary source motions to be displayed. The examples of described procedure for laser interferometers being apart up to 140 km and obtained data are presented.
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