qiàn(英语:Graben)在地质学上是一沉陷的地块、两旁有平行断层接壤。 地壳产生断裂变位时,地层沿着断层线断裂后,相对向下陷落的部分,成为地堑。

地堑的横切面图

参见

参考文献

  • McKnight, Tom L; Hess, Darrel. The Internal Processes: Graben. Physical Geography: A Landscape Appreciation. Upper Saddle River, NJ: Prentice Hall. 2000: 417. ISBN 0-13-020263-0.

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