集集大地震主要由於車籠埔斷層再次活動所引起。就已有資料指出斷層引致之地表破裂呈南北走向,南起雲林縣桶頭地區,北至台中縣石岡壩,之後轉為東北走向延伸至苗栗縣卓蘭內灣一帶即不復見,斷層主要以逆衝分量為主;唯斷層之後再於台中縣雙崎附近出現,但呈右移形式。 車籠埔斷層在集集地震之後廣為學者研究,然而在卓蘭區域則未被詳細探討。就本研究區域內的地質構造有:東勢背斜與內灣向斜等褶皺,加上九房厝斷層、梅子斷層。由以上的構造分布顯示此區域的新期構造運動模式可能深深受到這些構造的存在及活動性所影響。 本研究利用多種遙測技術及影像分析工具,配合已有的低解析度數值地形模DTM(Digital Terrain Model)及農林航空測量所地表控制點GCP(Ground Control Point)等已有之資料,整合不同資訊來求取不同影像之空中三角等資料,從而建置數個不同時期之2公尺高精度數值地形模型;一方面探討數值地形模型之精度及平差法,另一方面運用所建置之數值地形模型及正射後之影像來探討卓蘭地區因斷層活動所引致之垂直及水平變位,並探討斷層所在位置、特性及斷層的延伸性。
The Chi-Chi earthquake, 1999, was caused by the reactivation of the Chelungpu fault. The surface rupture, generated by the fault activity, trending north-south, from Yunlin County in the south to Shihgang Dam in Taichung County in the north. After Shihang Dam area the surface rupture trace then turned northeast to extend to the Neiwan, Chaolan Township in Miaoli County, and after the Neiwan area the trace is disappear. The fault segments demonstrates its mainly thrust components, in general. However, the surface rupture trace is appearing again near the Shuangchi area in Taichung Count, but activate as a pure dextral lateral fault. Chelungpu fault is been well document, however due to is variety of mechanism and structure inheritance, the detail trace and mechanism in the Chaolan area in still in debated issue. Several geological structures within the study area, e.g. the Dongshih Anticline, the Neiwan syncline, the Jioufangcuo fault and the Meizih fault etc., may affect greatly to the regional neotectonic activity and structure pattern. In this study, serials of the remote-sensing images and analysis tools are deployed. By integrating the existing low-resolution DTMs, the ground control points (GCP) and other information to obtain the aerial triangulation of each images, and finally several 2-m high-resolution DTMs in different periods are constructed accordingly. Based on the high-resolution DTMs and the ortho-rectified images, to decipher the regional structures, co-seismic and post-seismic surface deformation on the Chaolan area.
為了持續優化網站功能與使用者體驗,本網站將Cookies分析技術用於網站營運、分析和個人化服務之目的。
若您繼續瀏覽本網站,即表示您同意本網站使用Cookies。