Introduction - Semi-quantitative Approaches for Landslide Assessment and Prediction - page 6

Table 1.2 Location and character of the major landslide phenomena in the Shivkhola Watershed
Landslide
No.

Location Specic location of

the slides

Elevation
and slope
angle

Lithology Area of the

slide

Triggering factors Type of the

slide

390 m 2 1 Mahanadi-I 36.5 km. N of

Siliguri

57 °

1,150 m

Phyllite Solifluction and gravita-

tional pull

Debris slide

120 m 2

2 Mahanadi-II 36.55 km. N of

Siliguri

62 °

1,148 m

Quartzite Solifluction and seeping

of water

Debris slide

300 m 2 3 Mahanadi-II 36.6 km. N of

Siliguri

65 °
1,150 m

Quartzite and
phyllite

Supersaturation of the
materials

Debris slide

4 Tindharia

(Rly. Station)
—

26 km north from
Siliguri

57 °

927 m

Phyllite,
Quartzite-schist

56 m × 31 m High intensity rainfall

and saturation of
materials

Earth slide

September
2006

6532.5 m 2 5 Tindharia

downslope

26.5 km north from
Siliguri

>65 °

925 m

Phyllite,
Quartzite-schist

Cohesiveless materials
and steep slope

Earth fall

6 Paglajhora

sinking zone
(lower)

39 km north from
Siliguri

>65 °

1,136 m

Foliated gneiss
and mica schist

Around 2 km
(both up and
down slope)

Reduction of shearing
strength due to
supersaturation of
slope materials

Subsidence
and sinking

68 °
1,137 m

7 Lower

Paglajhora
road
subsidence

38.5 km north from
Siliguri

Foliated gneiss
and mica schist

200 m length
of road

Reduction of shearing
strength due to
supersaturation
of slope materials

Subsidence
and sinking

8 Lower

Paglajhora
Road
Abandonment

38 km north from
Siliguri

70 °
1135 m

Foliated gneiss
and mica schist

125 m length
of road

Reduction of shearing
strength due to
supersaturation of
slope materials

Subsidence
and sinking

(continued)