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汉语拼音：dì qiàn

两条断层中间的岩 块相对下降，两边的岩块相对上升，相对下降的岩块叫地堑。它常形成狭长的凹陷地带，如东非大裂谷。

地堑 [地盘因一对高角度正断层所造成之中部凹陷地形，称为地堑；而一对高角度正断层所造成之中部凸隆地，称为地垒@@@@@horst@@@@@。#####]

1. 地盘因一对高角度正断层所造成之中部凹陷地形，称为地堑；而一对高角度正断层所造成之中部凸隆地，称为地垒@@@@@horst@@@@@。

• A graben creates a favourable setting for uranium deposition.

  地堑成为铀矿沉积的有利部位.

• Extensional basin includes mainly graben and half - graben controlled by low detachment.

  大多数地堑和半地堑是由深度近水平的拆离正断层控制的.

• Taking Yishu graben as an example the application of these methods is presented.

  并以伊舒地堑汤原断陷为例,说明了这些方法的应用.

• Because the faults are colossal and very directive , the horst structure is developed.

  由于断层规模大,方向性强,致使地堑构造发育.

• Weihe rift ( or graben ) is a fault - subsiding belt in the south of Ordos block.

  渭河裂谷 ( 或渭河地堑 ) 是鄂尔多斯地块南侧的新生代断陷带.

• From composite half - graben or half - graben system, the whole sag was divided into five half - graben system.

  从复合式半地堑或者半地堑体系(系统)来分析, 将整个凹陷划分为五个半地堑体系.