A Study on an Empirical Formula for Amplification Factor Based on Fundamental Peak Frequency and Amplitude of Microtremor H/V
| Autor: | Nishikawa, Hayato, Noguchi, Tatsuy, Miyajima, Masakatsu, Kagawa, Takao |
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| Jazyk: | japonština |
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | 日本地震工学会論文集 = Journal of Japan Association for Earthquake Engineering. 19(7):7_41-7_55 |
| ISSN: | 1884-6246 |
| Popis: | 金沢大学理工研究域地球社会基盤学系 本研究では微動H/Vにより簡便かつ精度良く最大地動速度の地盤増幅度を評価することを目的として，基盤への入射スペクトルの特性を考慮した経験的な地盤増幅度評価式を求めた．まず，著者らの提案した理論地盤増幅度評価式をもとにサイト増幅特性の1次ピーク振動数と振幅をパラメータとする経験式を導き，地盤増幅度を精度良く評価できることを示した．続いて，地震観測記録から評価した地盤増幅度を対象にサイト増幅特性のパラメータを用い地盤増幅度評価式を求めた結果，地盤増幅度の観測値と評価値の間に高い相関が得られた．最後にサイト増幅特性の代わりに微動H/Vを用い経験的な地盤増幅度評価式を求めたところ，既往研究で用いられているタイプの経験式に比べて，高い精度で地盤増幅度を評価できることを明らかにした． We propose an empirical formula expressed by using indices of microtremor H/V in order to easily evaluate an amplification factor for peak ground velocity in consideration of an effect of input motion spectra for bedrock. Firstly, an empirical formula model for an amplification factor consisting fundamental peak frequency and peak amplitude is derived based on a theoretical model proposed by authors. It is found that the empirical formula can accurately evaluate the amplification factors. Next, a formula for amplification factors evaluated from observation records is obtained by using parameters of site effect. The observed amplification factors show strong correlation to the ones evaluated by the formula. Finally, we develop an empirical formula by using a microtremor H/V instead of the site effect. Consequently, it is clarified that the empirical formula can evaluate the observed amplification factors more accurately than the formula model in the past studies. |
| Databáze: | OpenAIRE |
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