DISASTER MANAGEMENT

1. LANDSLIDE
Submitted by- kushagra, Prince

2. INTRODUCTION TO TOPIC
Landslides, also known as landslips, are several forms of mass wasting that may include a
wide range of ground movements, such as rock falls, deep-seated slope failures, mudflows,
and debris flows.
A landslide near Cusco, Peru, in 2018

3. Types of landslides
Landslides are generally classified by type of movement (slides, flows, spreads, topples, or falls) and type
of material (rock, debris, or earth).

4. CASE STUDY OF MALIN, PUNE

29. Case study -02
Gangtok, geographically bounded by 27.3325°N latitude to 88.6140°E, longitude is situated
at an altitude of about 1800 m above sea level encompassing the third highest mountain
(Mount Kanchenjunga) in the World. Gangtok city is flanked by two rivers, i.e. Rorochu in the
eastward side and Ranikhola on the west. Both the rivers meet at Ranipool and flow towards
the south before they again join the Teesta at Singtam. The city is located at the south-facing
slope of Eastern Himalaya and has erosional topography bounded and dissected by a large
number of perennial and seasonal springs. The study area experiences a high variation of
rainfall throughout the year.

30. For the city, 7 June 1997 is often referred as a ‘black day’ since in this particular date, the city had
witnessed a number of landslides due to heavy rainfall (approximately 224 mm) causing more
than 50 fatalities, 60 people injuries, more than 5000 people lost their home and disruption of
National Highway 31A (near Rangpo town).

31. Location map of the study area.

32. Annual rainfall in Gangtok for the period of 2006–2017 (Source: Indian meteorological
department)

33. (a) Geological map of the Gangtok and its surrounding area,
(b) (b) cross-section along A-B line, (c) cross-section along C-D line

34. Showing landslide scars in study area detected by LISS IV (left side) and google earth pro (right
side)

35. Landslide inventory map of the study area.
The study area mostly consists of gneissic rocks
and schistose rocks type
due to high rainfall, rocks are highly weathered
and eroded at many places which causes
frequent landslides.

36. THANKYOU