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In this article, we report the results of a study on occurrence of a mass-movement event classified as ‘rock avalanche’ over the North Terong glacier (a tributary of the Siachen Glacier in the Nubra Valley), using multi-date remote-sensing data of Landsat Thematic Mapper (TM), Enhanced Thematic Mapper Plus (ETM+), and Operational Land Imager (OLI) and its effects on glacier-surface velocity. Normalized cross-correlation image matching method for displacement measurements at sub-pixel level using Computer Imaging Analysis Software (CIAS), an add-on module of Environment for Visualizing Images (ENVI) software, was used to map changes in the position of debris-deposits of the rock avalanche and assess variations in glacier-surface velocities. Well-defined debris margins gave positions of debris on different dates. Study indicated that this rock avalanche must have occurred between 21 April 2000 and 8 May 2000 (possibly on 3 or 4 May). It induced a kinematic wave or a ‘mini-surge’ in the glacier with its surface velocity showing almost twofold increase in post-event period.
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Bhutiyani et al. (2018) studied this question.
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