台灣東北部地區隱沒帶地震強地動衰減式之研究

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姓名

林柏伸(Po-Shen Lin) 查詢紙本館藏

畢業系所

應用地質研究所

論文名稱

台灣東北部地區隱沒帶地震強地動衰減式之研究
(Strong Ground-Motion Attenuation Relationship for Subduction Zone Earthquakes in Northeast Taiwan)

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摘要(中)

近期國外的研究指出，隱沒帶地震與淺部地殼地震的強地動衰減情況頗不相同，而強地動衰減式是進行地震危害度分析時必要的，且對結果極為敏感的一項數學式，故須針對台灣的隱沒帶地震進行研究。一個合適的衰減式不僅可以瞭解一地區的強地動衰減特性，並可以用來預估特定工址的強地動值，提供工程耐震設計之用。本研究使用中央氣象局自由場強地動觀測網計畫(TSMIP)及中央研究院地球科學研究所SMART1陣列所蒐集之台灣東北部地區隱沒帶板塊介面型及板塊內部型地震的強震資料，來建立最大加速度及反應譜加速度衰減式。考慮台灣東北部地區的隱沒帶地震缺少大規模、近場及遠場資料，因此本研究又選取部分國外大規模近場及遠場隱沒帶地震資料合併做強地動衰減式之迴歸分析。分析過程中，將板塊介面型地震與板塊內部型地震及堅硬地盤與軟弱地盤的強地動衰減式分開考慮，並採用了震矩規模及震源距離來進行迴歸分析。衰減模式採用Crouse (1991)所提出之隱沒帶地震地動衰減模式，迴歸技巧採用區塊登山法來搜尋誤差平方和達最小值時之各項參數。分別獲得能代表兩類地盤及兩型震源的最大水平加速度與反應譜加速度衰減式。此衰減式所推估之強地動值較過去淺地殼地震地動衰減式為高，但仍然略低於國外隱沒帶地震強地動衰減式的推估值。

摘要(英)

Recent study revealed that the attenuation of strong ground-motion is different between subduction zone earthquakes and shallow crustal earthquakes. A strong ground-motion attenuation equation is essential and influential for seismic hazard analysis. Therefore, we need to study the strong ground-motion attenuation relationship for subduction zone earthquakes in Taiwan. A suitable attenuation equation can express the characteristics of the strong ground-motion attenuation for a region, and can be used to predict the ground-motion value of a specific site for seismic resistance design.
In this study, strong ground-motion data of subduction zone both interface and intraslab earthquakes from TSMIP and SMART1 array in northeastern Taiwan were used to establish PGA and SA attenuation equation. Considering the lack of higher magnitude, near field, and far field data of the subduction zone earthquakes in northeastern Taiwan, some globle subduction zone earthquake data were included for regression analysis of the attenuation equation.
In the process of regression, strong ground-motion attenuation equations for interface, intraslab earthquakes were analysed, so as rock site and soil site. Moment magnitude and hypocentral distance were used in developing the attenuation equation. The attenuation form for subduction zone earthquakes proposed by Crouse (Crouse, 1991) was adopted in the analysis. Block hill-climbing algorithm were used to search the coefficient of the attenuation form that minimize the sum of squares of deviations. The resultant PGA and SA attenuation equations include two site class types and two earthquake source types. The ground-motion value predicted by this attenuation equation is higher than crustal earthquakes attenuation equation which usually used in Taiwan, but is lower than that predicted by the equation for worldwide subduction zone earthquakes.

關鍵字(中)

★ 加速度反應譜
★ 隱沒帶地震
★ 強震地動
★ 最大地表加速度
★ 衰減模式

關鍵字(英)

★ subduction zone earthquakes
★ strong ground motion
★ Attenuation Relation
★ Peak Ground Acceleration
★ Spectral Acceleration

論文目次

目錄
中文摘要 Ⅰ
英文摘要 Ⅱ
誌謝 Ⅲ
目錄 Ⅳ
圖目 Ⅶ
表目 Ⅸ
第一章緒論...............................1
1.1 研究動機與目的 ........................1
1.2 文獻回顧..............................2
1.2.1國外相關研究.........................2
1.2.2國內相關研究.........................4
1.2.3綜合回顧.............................7
1.3 研究內容與步驟 ........................9
第二章研究區域背景資料..................11
2.1 地體構造簡介.........................11
2.2 台灣北部隱沒帶構造...................14
第三章資料處理..........................17
3.1 隱沒帶地震的分類.....................17
3.2 ML及MW規模轉換關係...................17
3.3 強震資料選取.........................21
3.4 測站地盤分類.........................30
第四章衰減模式及分析方法................40
4.1 衰減模式.............................40
4.2 反應譜分析...........................42
4.3 迴歸分析方法.........................43
第五章台灣北部隱沒帶衰減模式............47
5.1 迴歸分析結果.........................47
5.1.1分析過程............................47
5.1.2使用台灣地區隱沒帶地震資料分析結果..47
5.1.3使用台灣地區隱沒帶地震資料及國外大規模隱沒帶地震資料分析結果.........................47
5.2 迴歸誤差σlny.........................57
5.3 與其他相關研究結果之比較.............57
5.3.1 與國內淺地殼地震地動衰減式比較.....57
5.3.2 與國外隱沒帶地震地動衰減式比較.....59
5.4 小結.................................62
第六章討論..............................63
6.1 規模轉換.............................63
6.2 震源深度H的效應......................63
6.3 σ與規模之間的關係....................64
6.4 登山搜尋法的缺點與改進...............64
6.5 反應譜的特性.........................66
6.6 資料相關問題.........................70
第七章結論與建議........................75
7.1結論..................................75
7.2建議..................................75
參考文獻.................................77
附錄A 台灣東北部隱沒帶地震水平向加速度反應譜衰減式之資料誤差分布圖.........................81
附錄B 台灣東北部隱沒帶地震水平向加速度反應譜迴歸分析殘差值與地震規模關係圖.................90
附錄C 台灣東北部隱沒帶地震水平向加速度反應譜迴歸分析殘差值與震源距離關係圖.................99
附錄D 台灣東北部隱沒帶地震堅硬地盤水平向最大加速度與各週期反應譜衰減公式與實際資料配適圖...108
附錄E 台灣東北部隱沒帶地震軟弱地盤水平向最大加速度與各週期反應譜衰減公式與實際資料配適圖...122

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指導教授

李錫堤(Chyi-Tyi Lee)

審核日期

2002-7-18

推文