Downslope movement of rock, soil, or artificial fill under the influences of gravity.
This category is also used for avalanches, debris avalanches, debris flows, earth flows, mudslides, rockfalls, slides (land), and slumps.

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Alteration, slope-classified alteration, and potential lahar inundation maps of volcanoes for the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Volcano Archive

Identifies hydrothermally altered volcanic edifices and vulnerable areas downstream by mapping alteration on volcanoes, highlighting lahar prone watersheds using Global Digital Elevation Model data, and modeling via a lahar flow-fill modeling program