Abstract
Results of the retrospective analysis of spectral parameters of earthquakes off the coast of Honshu Island, in the area of the catastrophic Tohoku-Oki event of March 11, 2011, are presented. Spectra of longitudinal waves on teleseismic distances are considered. The increase in the ratio between the spectral amplitude of fluctuations at frequencies f = 0.1 Hz and f = 1 Hz some months prior to the catastrophic earthquake is studied. That is, by the time of the approach of the main shock, the share of high-frequency fluctuations in the spectrum decreases, which can testify to a change of the strain of the environment in the source zone of strong events.
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Original Russian Text © L.S. Chepkunas, E.A. Rogozhin, M.I. Ryzhikova, L.S. Malyanova, 2012, published in Seismicheskie Pribory, 2012, Vol. 48, No. 1, pp. 41–52.
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Chepkunas, L.S., Rogozhin, E.A., Ryzhikova, M.I. et al. Monitoring of spectral parameters of longitudinal waves from the strongest earthquakes in Honshu Island, Japan in 2011. Seism. Instr. 49, 27–35 (2013). https://doi.org/10.3103/S0747923913010040
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DOI: https://doi.org/10.3103/S0747923913010040