While I'm working on a project about landslides on the Tibet Plateau, I encountered many large and valley-filling deposits that seem to be some kind of mass movement but cannot find their source areas.

The phenomenon is usually observed at 4000 - 5000 m elevation and many areas have permafrost. I attached two screenshots to show one of them which dammed the river (the only one that dammed river in the region). Many other cases can be seen around this area in the google earth kmz file.

I was told it might be slow sliding caused by underlain ice melt or remaining glacier tills. Can someone who has working experience in high-elevation areas identify what kind of phenomenon is it?

Thanks in advance

Chenxiao Tang

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