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南崁斷層

南崁斷層,為一條逆移斷層,根據經濟部中央地質調查所2010年資料顯示,為存疑性活動斷層。 此斷層可能為正移斷層,兼具右移的走向滑移分量,呈西北走向。斷層位於林口台地和桃園台地的交界,由北部竹圍附近海岸向東南延伸至龜山,全長約14公里。經過調查發現,南崁斷層只是沖刷造成,並非實際的活動斷層,所以地質調查所後來也將此活動斷層除名[1]

地質

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於南崁桃園煉油廠址內的山坡,發現數條與「南崁線形」平行的小規模正斷層,並推測其為伴隨主斷層的小錯動。陳文福等(1994)於羊綢坑附近發現兩個開挖剖面;其中一個剖面以礫石層為主,夾泥沙層,有約50公尺寬的斷層帶,強烈擾動作用集中於10至15公尺的範圍,斷層帶呈鉛直約為西北-東南走向,位移無法得知,東北側林口層未受擾動,且岩層仍然近乎水平;另一剖面以砂層為主,具許多傾斜與錯動量較小的正斷層及其滑動面上的擦痕,而由礫石的破裂及斷層擦痕推定南崁斷層為右移斷層。未發現新的斷層露頭或岩層被擾動的現象,羊綢坑附近剖面已為黃棕色的砂所覆著,且未見因斷層帶而造成差異侵蝕的現象。

參考資料

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  1. ^ 住哪個縣市最安全?學者:桃園、因地震最少. [2018-02-09]. (原始内容存档于2019-09-21). 

外部連結

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南崁斷層
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