Influence of the rotational and translational component rotation on the H/V spectra despite of the applied spectrum estimation method
摘要
The article presents horizontal-to-vertical (H/V) spectral ratios estimated for the rotated horizontal components of the registered signals. Estimations were performed for rotational and translational signals using waveforms from mining-induced seismic events. The amplification curves were estimated for each case of the axis rotation using the Fourier Spectrum Amplitude (FSA) and the Response Spectrum Analysis (RSA). Estimating the amplification spectrum for the rotated horizontal components is a method that allows determining the directional amplification effect, connected with the local anisotropy and fault occurrence. The Quaternary fault presence characterises the closest proximity of the station. Therefore, the surveys assumed analysis of the possibility and limitations of the directional amplification effect estimation by using records of rotational and translational motion as well as both approaches of the H/V estimation. The comparisons presented the limitation of the RSA approach in estimating the rotational H/V curve, which was an effect of the sensor settings on the pedestal. The directional amplification effect presented a perpendicular orientation to the close-distance fault, similar to rotational and translational motion analysis assuming the FSA approach.