Abstract
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.
Highlights
The instrumental ability and software advance of geophysical tools to extract a weak useful signal on a natural and anthropogenic noise background is one of the important issues of the applied facilities
Aseismic zone, where laser strainmeters operate at the Fryazino Beam-Waveguide [7], are placed within the Moscow Syneclise (Fig.1a)
The 18-meter laser strainmeter is located at the Karymshina complex geophysical observation site [8] on the Kamchatka Peninsula
Summary
The instrumental ability and software advance of geophysical tools to extract a weak useful signal on a natural and anthropogenic noise background is one of the important issues of the applied facilities. The 18-meter laser strainmeter is located at the Karymshina complex geophysical observation site [8] on the Kamchatka Peninsula This strainmeter is a modified unequalarms Michelson interferometer with a measuring arm length of 18 m, and the length of the reference arm is about 0.1 m (Fig. 2a). The 100-meter unequal-arm laser interferometer (Fryazino site) is equipped with a registration servo-system of compensation type [9]; its frequency range is limited near 100 Hz, and the highest resolution had been approved up to 0.01-0.001 nm in a 1 Hz band. Registration systems of modulation types are used in schemas of 18-meter unequal-arm interferometer (Karymshina) and 100-meter equal-arm interferometer (Fryazino), which provide an absolute instrumental resolution near 1.0-0.1 nm (record examples in Fig. 3 c, d, e and f). The modulation frequency is 200 Hz and a 14-bit ADC sampling rate is 2 kHz
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