• The pre-disaster studies have been pursued since early 80’s.
• The initial studies carried out in different parts of the country on various scales, such as
  
  • Landslide hazard Rating in the North Eastern Region, 1980
  • Landslide Hazard Zonation of Parts of Nilgiris, 1982

Basin-wise LHZ studies were started by the GSI in different parts of Himalayas and in the North East states in the beginning of eighties.

LHZ MAPPING ON MACRO- SCALES (1:50,000 OR 1:63360 SCALES)

HIMACHAL PRADESH

Satluj Valley – 3018 sq km
Beas Valley – 3032 sq km
Ravi Valley – 952 sq km

JAMMU AND KASHMIR

Chenab Valley – 2750 sq km

UTTARANCHAL

Ganga Valley (including Alaknanda and Bhagirathi) – 7420 sq km
Yamuna Valley – 1200 sq km

AREA SPECIFIC LHZ MAPPING

Area around Nainital – 150 sq km

COMMUNICATION ROUTE-WISE LHZ MAPPING

Yamunotri Yatra Route – 144 km
Gangotri Yatra Route – 119 km
Kedarnath Yatra Route – 82 km
Badrinath Yatra Route – 300 km
Kailash- Mansarovar Yatra Route – 575 km
Shimla-Kalka Heritage Rail Route – 90 km

LHZ MAPPING ON MESO/ MICRO- SCALES (1:5,000 OR 1:10,000 SCALES)

Nainital township -10 sq.km (1:5000 scale)

NORTHEASTERN REGION

LHZ MAPPING ON MACRO- SCALES (1:50,000 OR 1:63360 SCALES)

ASSAM

LHZ mapping around Guwahati – 600 sq.km

ARUNACHAL PRADESH

Itanagar Urban complex – 140 sq.km

MEGHALAYA

East Khasi hills and RiBhoi districts – 1000 sq.km
Parts of Assam and Meghalaya – 1000 sq.km

MIZORAM

South Mizoram – 67 sq.km
Aizwal Mamith districts – 798 sq.km
Kolasib and Aizwal districts – 410 sq.km
Serchhip and Chhiahtlang townships – 225 sq km

EASTERN HIMALAYAS

LHZ MAPPING ON MACRO- SCALES (1:50,000 OR 1:63360 SCALES)

Darjeeling Himalayas – 3000 sq km

ALONG COMMUNICATION ROUTES

NH-31 A – 56 km

LHZ MAPPING ON MESO/ MICRO- SCALES (1:5,000 OR 1:10,000 SCALES)

Kalimpong Municipal Area – 8.68 sq km (1:10000 scale)
Mirik Municipal Area – 6.50 sq km (1:10000 scale)
Gangtok township – 7.5 sq km (1:10000 scale)