強地動衰減式中標準差σ 的大小會直接影響地震危害度分析的結果，尤以長再現期的部份影響更大。因此，”如何合理的降低σ？”成為近年來相關領域討論的重點。本計畫擬利用國內豐富的強地動資料進行場址特定衰減式迴歸分析並求取場址特定標準差σs 及延伸今年度進行中的”新一代台灣地區反應譜衰減式之研究”計算單站標準差σi，比較σs 與σi 的差異，期能有效地降低輸入至地震危害度分析中的σ 值。計畫核心工作包括：TNGA 資料庫強震資料增補、場址特定強地動反應譜衰減式分析、全台灣強地動反應譜衰減式中的單站σ 值分析及成果比較及評估等。 ; The magnitude of the standard deviation of the logarithmic residuals in ground-motion prediction (termed as σ) may directly influence the result of probabilistic seismic hazard analysis, especially in low probability. Therefore, “how to reduce the σ?” becomes an important issue in recent years. This proposal plans to utilize the plenty strong-motion data in Taiwan to perform site-specific attenuation study, and derive a site-specific attenuation relationship and standard deviation of the logarithmic residuals. This standard deviation is called site-specific standard deviation, σs. This study also extends the on going NSC project “Next Generation Spectral Attenuation of Taiwan” to include the calculation of single-station standard deviation of the logarithmic residuals, σi. Then, a comparison of the rate of reduction between σs and σi will be made, and the results discussed. The core works in the project include: expanding the TNGA database to include more earthquakes, developing site-specific spectral attenuation relationship and σs for sites, calculating σi from single-station residuals in the spectral attenuation equations of Taiwan, and results comparison and evaluations. ; 研究期間 9708 ~ 9807
