Figure 4From: Investigation of the initiation mechanism of an earthquake- induced landslide during rainfall: a case study of the Tandikat landslide, West Sumatra, Indonesia Stratigraphy of Tandikat landslide area (a) Outcrop showing the distinctive layer of sandy clay overlain by pumice sand (b) Water ponding on the sandy clay layer, illustrating the low permeability of this layer. Back to article page