三維衛星遙測影像處理技術應用於活動斷層調查
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摘要
以車籠埔斷層與新城斷層之衛星遙測影像處理與判釋為例,利用經三維影像線型強化技術處理後之衛星影像,可準確研判斷層位置與活動性,並提供可為各方接受之影像證據。其中,車籠埔斷層活動性研究結果在921集集大地震中獲得證實,其地表錯斷位置與遙測判釋位置幾近一致,準確度可見一斑。
Satellite remote sensing images provide factual image evidence in tracing faults that cut through the ground surface. This facilitates evaluation on the extent of the fault, since the fault trace can be directly read from the images. A three-dimensional computation model is employed, which is constructed from DTM data, with satellite image mapping on it. By the image-enhancing procedure of simulating different light projecting direction and locating position by computer, the invisible fault trace can be easily identified. Furthermore, if the image indicates that the fault scarp cuts through a set of river terraces or recent fluvial deposit, the activity of the fault can be determined. Two cases, Chelungpu Fault and Hsinchang Fault, are discussed. These case studies shows that the satellite image-enhancing procedure is very useful for the fault activity study, especially in the plain area. It can improve the fault trace features and provide direct image evidence regarding the fault activity to the researcher. In the case of Chelungpu Fault, the big earthquake occurred 3 years after our active fault confirmation report, proved our study. In addition, if the map of the fault trace by satellite image is superposed on that of the recent earthquake rupture, these two traces almost cover each other in the research area.
Satellite remote sensing images provide factual image evidence in tracing faults that cut through the ground surface. This facilitates evaluation on the extent of the fault, since the fault trace can be directly read from the images. A three-dimensional computation model is employed, which is constructed from DTM data, with satellite image mapping on it. By the image-enhancing procedure of simulating different light projecting direction and locating position by computer, the invisible fault trace can be easily identified. Furthermore, if the image indicates that the fault scarp cuts through a set of river terraces or recent fluvial deposit, the activity of the fault can be determined. Two cases, Chelungpu Fault and Hsinchang Fault, are discussed. These case studies shows that the satellite image-enhancing procedure is very useful for the fault activity study, especially in the plain area. It can improve the fault trace features and provide direct image evidence regarding the fault activity to the researcher. In the case of Chelungpu Fault, the big earthquake occurred 3 years after our active fault confirmation report, proved our study. In addition, if the map of the fault trace by satellite image is superposed on that of the recent earthquake rupture, these two traces almost cover each other in the research area.
引文
1 陳晟,侯秉承,張吉佐.SPOT衛星影像資料在地質上之應用[A]. 见:海峡兩岸地質學術研討會論文集[C].[s.l.]:[s.n.],1995,455- 458
2 陳晟,方中權,侯秉承.車籠埔斷層之衛星遙測影像處理與判 釋[A].见:台灣之第四紀第六次研討會暨台北盆地地下地質與工 程環境綜合調查研究成果發表會論文集[C].[s.l.]:[s.n.],1996, 234-239
2 陳晟,方中權,侯秉承.車籠埔斷層之衛星遙測影像處理與判 釋[A].见:台灣之第四紀第六次研討會暨台北盆地地下地質與工 程環境綜合調查研究成果發表會論文集[C].[s.l.]:[s.n.],1996, 234-239
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