https://scholars.lib.ntu.edu.tw/handle/123456789/37536
標題: | 台灣地震地質研究-台灣西南部活斷層研究─台灣西南部活動斷層之長期滑移速率及其相關之構造地形(1/3) | 作者: | 陳于高 | 關鍵字: | 新期地體構造運動;地理資訊系統;數值高程模型;三維模型處理軟體;碳十四定年;光螢光定年;熱螢光定年;neotectonic activity;geographic information system (GIS);digital elevation model (DEM);3-D modeling software (GOCAD);14 C dating;optically stimulated luminescence dating (OSL);thermoluminescence dating (TL) | 公開日期: | 2005 | 出版社: | 臺北市:國立臺灣大學地質科學系暨研究所 | 摘要: | 本計畫配合整合型計畫之其他子計畫,探討台灣西南部麓山帶與平原地區活動斷層 的確實位置與滑移速率。目前台灣地區雖由地調所發表了四十二條活動斷層,然而除了車 籠埔斷層外,我們對於其他斷層的了解是相當有限的,本研究希望可以藉由車籠埔斷層的 研究經驗,對於台灣西南部可能造成高度破壞的地震斷層,深入了解其地表分部與長期滑 移速率,希望可以在大地震發生之前,完成每一條活動斷層的研究與調查。 本計畫主要採用地形學與定年學的方法。在今年正在執行的計畫中,已經使用地理 資訊系統軟體,與台灣現在之數值高程模型資料(40m DEM),將整個台灣西南地區的構造 地形完成了細部分區與初步特徵鑑定,對局部重要地區(如:恆春、潮州與觸口斷層)也已購 買航空照片,與並訂購高解析的衛星影像(QuickBird 或Ikonos),著手生產高解析度(<5m in grid)數值高程模型資料,期待可以在判讀構造地形與活動斷層位置的工作上更為精確。另 外地震與構造活動是息息相關的,因此將過去地震資料重新定位後,再配合先前所購買的 三維模型處理軟體(GOCAD),建立出相關斷層的三維構造模型,可將了解地下構造的延 伸,如此結合地表與地下結果,希望能一窺主要活動構造的全貌,進而了解活動機制與行 為。 徹底了解活動構造之幾何型態後,再配合碳十四、熱螢光、光螢光等定年法,來測 定構造運動所造成的河階台地或錯動地層年代,進行精細的比對工作,便可進一步計算活 動構造之長時間滑移速率。近年所研發之單顆粒光螢光定年儀,對於台灣這種山高水急所 堆積的河相沉積物,可以排除曬退不完全所導致的年代高估情形,大大提昇光螢光定年資 料的準度與精度,並且可以解決目前日益增加的年代需求問題。 因此,本計畫在今年的研究工作後,規劃再利用三年的計畫執行期間,徹底的針對 台灣西南部人口稠密區之活動斷層進行研究,本計畫希望達成下列三項目標: (1) 了解台灣 西南部活動斷層之構造形貌 (2) 推估長期之滑移速率 (3) 改進定年技術。 This project will collaborate with other principal investigators in the integrate project to work on the neotectonics of southwestern Taiwan. As we know, 42 active faults have been identified by Central Geological Survey, ROC. Except for the Chelungpu fault, the 1999 earthquake fault, we only have insufficient information on the others. Based on the Chi-Chi experience, this project aims to find out the potential earthquake faults in the proposed area and figure out their long-term slip rates. Hopefully, we can prepare well before next disaster coming. The methods of Geomorphology and Geochronology will be adopted in this project. The GIS software and 40m DEM of Taiwan have been used to roughly divide the study area into several neotectonic domains by characterized geomorphic features and distinguishable structures. The high priority domain has been started to study by high resolution DEM (<5m), produced by aerial photos and high-resolution satellite imagery (QuickBird and Ikonos). The result provides precise tectonic features that can be linked to active fault systems, i.e. Hengchun, Chouchao, and Chukou-Tachienshan. On the other hand, the distribution of the seismicity provides a good opportunity to further understand the subsurface geological structures. We will use the relocated earthquakes to establish the seismogenic structures by the 3-D modeling software (GOCAD). The last step is to combine the surface features with the subsurface structural framework to give an evaluation on the faulting mechanism and behavior. For the purpose of computing the recurrence interval, dating methods of radiocarbon, optical stimulated luminescence (OSL), and thermoluminescence (TL) are used to build up the time frame. The dating methods can also be applied to the river terraces and tablelands in the surrounding area to derive the long-term slip rates of the active structures, which is of great importance in evaluating the current situation of the active faults. For confirmation of the residual luminescence signals in the fluvial sediment, a new single-grain reader is urgently needed to solve the poorly-bleached problem and provide more terraces ages. The project plans three more years to accomplish the goals: 1) to evaluate of characteristics on all active faults by surface and subsurface datasets; 2) to figure out the long-term slip rate of them; 3) to improve the dating techniques. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/11871 | 其他識別: | 932119M002026 | Rights: | 國立臺灣大學地質科學系暨研究所 |
顯示於: | 地質科學系 |
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932119M002026.pdf | 84.28 kB | Adobe PDF | 檢視/開啟 |
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