車籠埔斷層

認識活動斷層

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發布日期：2017-12-06 點閱次數：53820

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車籠埔斷層，為逆移斷層，為了方面敘述，本文以烏溪為界分為2部分：北段約呈南北走向，由臺中縣豐原市北陽里向南延伸至霧峰鄉，長約38公里，在1999年集集地震時，石岡以東至苗栗縣卓蘭鎮也形成地表破裂與地面隆起，長約16公里（經濟部中央地質調查所，1999；李元希等，2000）；車籠埔斷層南段約呈南北走向，由南投縣草屯向南延伸至竹山鎮嶺腳附近，長約38公里（林啟文等，2000b）。在豐原以北，斷層可能連接三義斷層；竹山以南，斷層連接鹿寮斷層與大尖山斷層（林啟文等，2000b）。

總結與評估

車籠埔斷層，由錯移地層的關係，最早認為斷層向北連接三義斷層，向南連接大尖山斷層；上述3條斷層的下盤均出露頭嵙山層，但是三義斷層上盤出露東坑層（或南莊層），而車籠埔斷層上盤出露錦水頁岩或卓蘭層，大尖山斷層上盤則出露桂竹林層。由鑽井資料顯示，車籠埔斷層北段在其下方有另一條斷層，桂竹林層逆衝於頭嵙山層之上，該斷層雖未出露地表，但延伸至地表的位置約位於三義斷層的斷層跡，兩者的接觸約在豐原附近。至於車籠埔斷層南段則連接鹿寮斷層，並與大尖山斷層的特性有所不同，雖然後者在集集地震時也有活動。

1999年集集地震時所形成的地表破裂，很多地區在地表上顯現寬廣的斷層帶，地表所見的斷層崖、單斜崖與撓曲崖等，是由主斷層分叉而出、且位於上盤的分支斷層反應在地表的特徵。地震斷層在山麓前緣，也就是山麓與平原的交界處，大多位於錦水頁岩的底部；山麓區內，常位於車籠埔斷層上盤的錦水頁岩層中或是位於卓蘭層的底部。

由車籠埔斷層的古地震研究結果，過去3,000年以來共有7次地震事件造成地表破裂，包括西元1999年、距今365 ± 65年前、距今735 ± 55年前、距今905 ± 15年前、距今1,540 ± 160年前、距今1,805 ± 95年前與距今3,000 ± 160年前；最後6次地震之間的發生時距最小約200年，最長約700年；最早的2次古地震的時距相距約1,200年，可能還有許多次的古地震事件未被發現。車籠埔斷層的長期滑移速率為每年6.94公厘，發震模式屬於時間可預測的再發性模式，以長期的滑移速率來推估車籠埔斷層下次可能的地震時間，約西元2340 ± 95年，車籠埔斷層列為第一類活動斷層。

車籠埔斷層條帶地質圖。B：豐原至烏溪部分。測線名稱加框示測線位置重複或鄰近（座標系統：TWD67）

車籠埔斷層條帶地質圖。C：烏溪以南的部分。測線名稱加框示測線位置重複或鄰近（座標系統：TWD67）

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完整資訊

斷層相關參考資料

開啟檢視 關閉檢視

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