Numerous old deposits occur in the Eastern Himalayan Syntaxis, especially on the banks of the Yarlung Tsangpo River and its tributaries, where strong tectonic movement and riverine erosion increase the potential for landslides. The possible future deformation and failure processes of these old deposits and their impacts on the surrounding environment are important research topics. Field investigations and temporarily coherent point interferometry synthetic aperture radar (TCP-InSAR) monitoring show that the Tongmai old deposit is prone to catastrophic failure and landsliding. A geomorphological analysis and the related dating results indicate that the Tongmai old deposit consists of residual colluvial or early moraine debris and was formed later than 11.06 ± 0.94 ka BP. The TCP-InSAR analysis indicates that creep deformation is present within the deposit and that this creep is closely related to the precipitation and activity of nearby faults, which may cause slope failure and lead to landslide dam formation. As a result, this study further predicts the likely scale of a landslide dam through numerical simulations. In the worst-case scenario, a landslide will seriously block the Parlung Tsangpo River and form a dam with a height of 100–152 m and a length of approximately 2.4 km. The Tongmai old deposit will likely form a geohazard chain including landslides, barrier lakes, and outburst flooding. Finally, this paper discusses the influence of the Tongmai old deposit on river and landscape evolution.

东部喜马拉雅地区有大量的老沉积物，特别是在雅鲁藏布江及其支流的河岸，强烈的构造运动和河流侵蚀增加了滑坡的可能性。这些老矿床将来可能发生的变形和破坏过程及其对周围环境的影响是重要的研究课题。现场调查和临时相干干涉合成孔径雷达（TCP-InSAR）监测表明，通脉老矿床容易发生灾难性破坏和滑坡。地貌分析和相关的年代测定结果表明，通脉老矿床由残留的冲积残渣或早期冰de碎屑组成，形成时间晚于11.06±0.94 ka BP。TCP-InSAR分析表明，沉积物中存在蠕变变形，并且该蠕变与附近断层的降水和活动密切相关，这可能会导致边坡破坏并导致滑坡坝的形成。结果，本研究通过数值模拟进一步预测了滑坡坝的可能规模。在最坏的情况下，滑坡会严重阻塞Parlung Tsangpo河，并形成一个高100-152 m，长约2.4 km的水坝。通脉旧矿床很可能形成包括滑坡，围堰湖和突出洪水的地质灾害链。最后，本文讨论了通脉老矿床对河流和景观演变的影响。这可能会导致边坡破坏并导致滑坡坝的形成。结果，本研究通过数值模拟进一步预测了滑坡坝的可能规模。在最坏的情况下，滑坡会严重阻塞Parlung Tsangpo河，并形成一个高100-152 m，长约2.4 km的水坝。通脉旧矿床很可能形成包括滑坡，围堰湖和突出洪水的地质灾害链。最后，本文讨论了通脉老矿床对河流和景观演变的影响。这可能会导致边坡破坏并导致滑坡坝的形成。结果，本研究通过数值模拟进一步预测了滑坡坝的可能规模。在最坏的情况下，滑坡会严重阻塞Parlung Tsangpo河，并形成一个高100-152 m，长约2.4 km的水坝。通脉旧矿床很可能形成包括滑坡，围堰湖和突出洪水的地质灾害链。最后，本文讨论了通脉老矿床对河流和景观演变的影响。滑坡将严重阻塞Parlung Tsangpo河，并形成一个高100-152 m，长约2.4 km的水坝。通脉旧矿床很可能形成包括滑坡，围堰湖和突出洪水的地质灾害链。最后，本文讨论了通脉老矿床对河流和景观演变的影响。滑坡将严重阻塞Parlung Tsangpo河，并形成一个高100-152 m，长约2.4 km的水坝。通迈旧矿床很可能形成包括滑坡，围堰湖和突出洪水的地质灾害链。最后，本文讨论了通脉老矿床对河流和景观演变的影响。