Study on a High-Cut Filter for Strong Ground Motion Prediction (Part3)

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Other Title
  • 強震動予測のための高域遮断フィルターに関する研究(その３)
  • ―国内で発生した地殻内地震の観測記録に基づく検討―
  • - Based on The Observed Records During Crustal Earthquakes in Japan -

Abstract

<p>Spectral decay characteristics in high frequency range due to large and small inland crustal earthquakes that occurred in Japan are examined. The Butterworth type high-cut filter with cut-off frequency, fmax and its power coefficient of high-frequency decay is assumed in this study. Four parameters such as seismic moment Mo, corner frequency fc, fmax, and its power coefficient s are estimated by comparing observed spectra at hard rock sites with theoretical spectra. The theoretical spectra are calculated, based on the omega squared source characteristics convolved with propagation-path effects and fmax filter shapes. In result, fmax's of six large earthquakes are estimated to be 7Hz to 10Hz and those of small earthquakes are estimated to be 9Hz to 20Hz. The power coefficients of the fmax filter, s, for earthquakes in Shizuoka and Kumamoto regions are larger than those for earthquakes in other regions. Therefore, a region dependency of spectral decay characteristic is suggested. Moreover, correction filter, PC(f), a filter to correct the difference of spectral decay characteristics between large and small earthquakes, are suggested. Finally, effects of spectral decay characteristics from large earthquakes on strong ground motion prediction are examined. The results in this study contribute to strong ground motion prediction in high frequency range.</p>

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