The Yinwashan and Xinminpu faults are located in the Jiuxi Basin in the western end of the Hexi Corridor. The determination of their activity and slip rates is of great significance for understanding the eastward extension of the Altyn Tagh fault. Based on geological and geomorphologic field survey, trench excavation, optically stimulated luminescence dating, we define the fault geometry and kinematic properties of the two faults. Based on fault scarps measurement using differential GPS and ¹⁰Be surface exposure dating, we determined vertical slip rate of 0.09±0.01 mm/yr for the Yinwashan fault and 0.1±0.02 mm/yr for the Xinminpu fault. Using the dips observed in trenches and natural sections, we estimated horizontal shortening rates of 0.05±0.03 and 0.23±0.06 mm/yr, respectively. No significant strike slip motion is observed on these two faults, and we infer that this region was dominated by horizontal shortening in the Late Quaternary. Although the shortening rate is quite low on each individual fault, together with other faults in this area, these two faults have an essential role in transferring slip from the eastern end of the Altyn Tagh fault and in accommodating the northeastward growth of Tibetan Plateau.

银瓦山断裂和新民埔断裂位于河西走廊西端的九溪盆地。确定它们的活动度和滑移率，对于了解阿尔金塔格断裂向东延伸具有重要意义。基于地质和地貌现场调查，沟槽开挖，光学激发发光测年，我们定义了两个断层的断层几何特征和运动学性质。基于使用差动GPS和^10的故障残量测量表面暴露测年以来，我们确定银瓦山断裂带的垂直滑动速率为0.09±0.01 mm / yr，新民铺断裂带的垂直滑动速率为0.1±0.02 mm / yr。使用在沟渠和自然断面中观察到的倾角，我们估计水平缩短率分别为0.05±0.03和0.23±0.06 mm / yr。在这两个断层上没有观察到明显的走滑运动，并且我们推断该地区主要是第四纪晚期的水平缩短。尽管每个断层以及该区域的其他断层的缩短速度都非常低，但这两个断层在转移阿尔金－塔格断层东端的滑移以及适应青藏高原的东北生长方面起着至关重要的作用。