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Source processes associated with the 2021 glacier collapse in the Yarlung Tsangpo Grand Canyon, southeastern Tibetan Plateau
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Source processes associated with the 2021 glacier collapse in the Yarlung Tsangpo Grand Canyon, southeastern Tibetan Plateau
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Journal Article
Source processes associated with the 2021 glacier collapse in the Yarlung Tsangpo Grand Canyon, southeastern Tibetan Plateau
2023
Overview
Massive slope failures often occur along the Himalayan orogenic belt, where the Indian plate subducts beneath the Eurasian plate. On March 22, 2021, a slope failure hazard occurred at the Grand Canyon section of the Yarlung Tsangpo River, eastern Himalayan syntaxis, and blocked the river leading to a water level rise of over 10 m. We conducted an analysis of the seismic waveforms recorded by broadband seismic stations which we deployed around the Grand Canyon. These seismograms showed emergent onsets with a total duration of approximately 300 s and corroborated their origination as a glacier collapse along the remote Sedongpu basin. Based on direct measurements of seismic energy and an empirical distance attenuation function, we estimated the volume to be approximately 50 × 106 m3. The source process was interpreted as a single force with three possible stages: progressive coherent block fracturing, mass flow through the Sedongpu basin with downslope acceleration-deceleration-stable motions, and continuous flow along the river after the formation of a temporary dam at the outlet basin.
