Abstract
Using data of a 52.5 m laser strainmeter of the non-equal-arm type, the paper compares direct and parametric methods of extracting tidal harmonics, some modes and overtones of the Earth’s free oscillations, and microseisms. It is established that maximums identified in spectra of laser strainmeter records by direct methods of measurement are a few orders higher compared to amplitudes revealed by parametric methods.
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Original Russian Text © S.G. Dolgikh, G.I. Dolgikh, 2008, published in Fizika Zemli, 2008, No. 11, pp. 77–83.
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Dolgikh, S.G., Dolgikh, G.I. Applications of direct and parametric methods in geophysical investigations. Izv., Phys. Solid Earth 44, 927–932 (2008). https://doi.org/10.1134/S1069351308110062
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DOI: https://doi.org/10.1134/S1069351308110062