Spectral Characteristics of Strong Ground Motion Time Series for Low to Medium Seismicity Regions with Deep Soil Atop Deep Geological Sediments

In this study, we examine the features of horizontal and vertical strong motion time series for sites with deep soil above deep geological deposits, in low-to-medium seismicity zones. New empirical regional equations were derived for spectral and peak ground acceleration attenuation based only on the strong-motion time series that were recorded in the north-western Balkans region. Results show that short-period horizontal spectral amplitudes at rock locations can be larger than those resulting from the combination of the deep soil and the deep geological deposits. However, the results also show that there is a significant increase in spectral amplitudes for larger vibration periods.