Abstract
Classical Russian S-5-S pendulum seismometer was modified for recording of the rotational components of ground motion. This seismometer was used for monitoring of mining induced seismic events in the Karviná region (Czech Republic). Together, three translational components of ground vibration velocity and one rotational component of ground vibration velocity around the vertical axis were recorded. Elaborated mining induced seismic events with epicentral distances up to 9 km were recorded in Doubrava locality, where the exploitation of black coal is still active. Numerical study of measured component attributes of mining induced seismic events is presented in this paper, namely squared Morlet wavelet coefficients and squared coherence spectrum between rotational and translational components. Squared Morlet wavelet coefficients enable to analyse time-and-frequency structure of elaborated signal, e.g. dynamics of the onset, evolution and disappearance of typical periods of the harmonic peaks, etc. Spectral measure of coherence was applied here for investigation of synchronization effects in 2-dimensional time series of translational and rotational components.
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This research was performed with the long-term conceptual development support of research organisations RVO: 68145535 and within the frame of cooperation between Russian and Czech researchers—bilateral agreement (joint theme “Investigation of microseismic field in Ostrava-Karviná region and other areas”).
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Lyubushin, A.A., Kaláb, Z., Lednická, M. et al. Coherence spectra of rotational and translational components of mining induced seismic events. Acta Geod Geophys 50, 391–402 (2015). https://doi.org/10.1007/s40328-015-0099-3
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DOI: https://doi.org/10.1007/s40328-015-0099-3