河阶（river terrace），亦称阶地、河阶地或堆积坡，即是河流下切作用造成河谷斜坡形成台地地形，阶地从一阶到多阶的河阶地形皆有，则视阶地地质与河流侵蚀能力而定。每一阶的阶地均包含阶地面、阶地前面斜坡、阶地前缘、阶地后缘和阶地后方陡坡等部份。阶地高度常以阶地面与河流丰水期水面之间的垂直距离做为高度依据。
大的走滑断裂带，如鲜水河断裂，是由主干断裂及与其相伴的若干阶式（或平行）断裂组成。
Some large strike slip faults, such as the Xianshuihe fault, consist of main fault and several sub-faults, which are commonly arranged as en echelon (or parallel) pattern.
由炉霍、道孚、乾宁三条次级断裂左阶斜列组合而成的鲜水河断裂带的北西段。
The northwest part of Xianshuihe fault consists of three subfractures which are Luhuo, Daofu and Qiannin Faults.
为了研究水文地质条件对低煤阶煤层气成藏的控制作用，对美国粉河盆地和我国准噶尔盆地进行了对比研究。
This paper deals with favorable and unfavorable factors of uranium mineralization in the Lianghe basin based on hydrogeological, palaeohydrogeological and hydrogeochemical characteristics.
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