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. Climate change and the associated rise in air temperature haveaffected the Tibetan Plateau to a significantly stronger degree than theglobal average over the past decades. This has caused deglaciation,increased precipitation and permafrost degradation. The latter in particularis associated with increased slope instability and an increase inmass-wasting processes, which pose a danger to infrastructure in thevicinity. Interferometric synthetic aperture radar (InSAR) analysis is wellsuited to study the displacement patterns driven by permafrost processes, asthey are on the order of millimeters to decimeters. The Nyainqêntanglharange on the Tibetan Plateau lacks high vegetation and features relativelythin snow cover in winter, allowing for continuous monitoring of thosedisplacements throughout the year. The short revisit time of the Sentinel-1constellation further reduces the risk of temporal decorrelation, making itpossible to produce surface displacement models with good spatial coverage.We created three different surface displacement models to study heave andsubsidence in the valleys, seasonally accelerated sliding and linear creepon the slopes. Flat regions at Nam Co are mostly stable on a multiannualscale but some experience subsidence. We observe a clear cycle of heave andsubsidence in the valleys, where freezing of the active layer followed bysubsequent thawing cause a vertical oscillation of the ground of up to a fewcentimeters, especially near streams and other water bodies. Most slopes ofthe area are unstable, with velocities of 8 to 17 mm yr−1. During thesummer months surface displacement velocities more than double on mostunstable slopes due to freeze–thaw processes driven by higher temperaturesand increased precipitation. Specific landforms, most of which have beenidentified as rock glaciers, protalus ramparts or frozen moraines,reach velocities of up to 18 cm yr−1. Their movement shows littleseasonal variation but a linear pattern indicating that their displacementis predominantly gravity-driven.

InSAR time series analysis of seasonal surface displacement dynamics on the Tibetan Plateau