Large-scale landslides in the Himalaya are defined as huge, deep-seated landslide masses that occurred in the
geological past. They are widely distributed in the Nepal Himalaya. The steep topography and high local relief
provide high potential for such failures, whereas the dynamic geology and adverse climatic conditions play a
key role in the occurrence and reactivation of such landslides. The major geoscientific problems related with
such large-scale landslides are 1) difficulties in their identification and delineation, 2) sources of small-scale failures, and 3) reactivation. Only a few scientific publications have been published concerning large-scale landslides
in Nepal. In this context, the identification and quantification of large-scale landslides and their potential distribution are crucial. Therefore, this study explores the distribution of large-scale landslides in the Lesser Himalaya.
It provides simple guidelines to identify large-scale landslides based on their typical characteristics and using a
3D schematic diagram. Based on the spatial distribution of landslides, geomorphological/geological parameters
and logistic regression, an equation of large-scale landslide distribution is also derived. The equation is validated
by applying it to another area. For the new area, the area under the receiver operating curve of the landslide distribution probability in the new area is 0.699, and a distribution probability value could explainN65% of existing
landslides. Therefore, the regression equation can be applied to areas of the Lesser Himalaya of central Nepal with
similar geological and geomorphological conditions
Large-scale landslides in the Himalaya are defined as huge, deep-seated landslide masses that occurred in thegeological past. They are widely distributed in the Nepal Himalaya. The steep topography and high local reliefprovide high potential for such failures, whereas the dynamic geology and adverse climatic conditions play akey role in the occurrence and reactivation of such landslides. The major geoscientific problems related withsuch large-scale landslides are 1) difficulties in their identification and delineation, 2) sources of small-scale failures, and 3) reactivation. Only a few scientific publications have been published concerning large-scale landslidesin Nepal. In this context, the identification and quantification of large-scale landslides and their potential distribution are crucial. Therefore, this study explores the distribution of large-scale landslides in the Lesser Himalaya.It provides simple guidelines to identify large-scale landslides based on their typical characteristics and using a3D schematic diagram. Based on the spatial distribution of landslides, geomorphological/geological parametersand logistic regression, an equation of large-scale landslide distribution is also derived. The equation is validatedby applying it to another area. For the new area, the area under the receiver operating curve of the landslide distribution probability in the new area is 0.699, and a distribution probability value could explainN65% of existingแผ่นดินถล่ม ดังนั้น สมการการถดถอยสามารถใช้ได้กับพื้นที่ของหิมาลัยน้อยเนปาลกลางด้วยสภาพทางธรณีวิทยา และ geomorphological คล้าย
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