Landslide Susceptibility Mapping in Darjeeling Himalayas, India

Table 2

Weights and ratings for various factors and their classes.

Factors	Classes	Weights	Ratings
Drainage buffer	1st order	10	9
	2nd order		5
Lineament buffer	0–125 m	9	9
	125–250 m		7
	250–375 m		5
	375–500 m		3
	>500 m		1
Slope	0°–15°	8	1
	15°–25°		3
	25°–35°		5
	35°–45°		7
	>45°		9
Rainfall	Moderate	7	6
	High		9
Earthquake	Moderate	7	6
	High		9
Lithology	Paro-subgroup (parogneiss)	6	4
	Darjeeling gneiss		6
	Gorubathan formation		7
	Feldspathic greywacke		2
	Graphite schist/gneiss		7
	Quartzite key beds (paroquartzite)		1
	Lingtse granite gneiss		8
	Rangit pebble slate		8
	Damuda formation		4
	Geabdat sandstone		3
	Chunabati formation		6
	Quaternary and recent sediments		9
	Composite of Rangit pebble slate and Damuda formation		6
	Composite of Rangit pebble slate, Damuda formation, and Gorubathan formation		7
	Composite of Damuda formation and Chunabati formation		5
Land use/land cover	Agriculture land	5	5
	Barren land		9
	Built-up area		2
	Scrub land		7
	Sparse forest		6
	Tea plantation		3
	Thick forest		1
	Waterbody		0
Fault buffer	0–125 m	5	9
	125–250 m		7
	250–375 m		5
	375–500 m		3
	>500 m		1
Valley buffer	0–100 m	4	6
	>100 m		0
Soil	Fine loamy	3	3
	Coarse loamy		6
	Loamy skeletal		9
Relief	<1000 m	3	3
	1000–2000 m		6
	>2000 m		9
Aspect	Flat	1	0
	North		1
	Northeast		4
	East		7
	Southeast		8
	South		9
	Southwest		6
	West		3
	Northwest		2