地壘(英語:horst)是一種地形,指中間地塊相對於兩側隆起的地形。如天山山脈。其形成的原因,是中間地塊與兩層地塊之間有正斷層,受到地殼運動的影響,地塊張裂,使兩側地塊下陷、中間地塊相對抬升,因而形成地壘。

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地壘的橫切面圖

外部連結

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