Landslide hazard zoning of India
Landslide, a frequently occurring natural hazard in the hilly terrains
of India, shows preponderance of activity during the monsoon period from
July to September and after the snow fall from January to March. The
strong earthquakes also cause triggering of landslide, particularly in
regions marked by critically disposed and unstable slopes. On a rough
estimate, nearly 15% of India’s landmass or 0.49 million sq km area is
prone to landslide hazard. This includes 0.098 million sq km of the
North Eastern Region, comprising the Arakan Yoma ranges, and 0.392
million sq km of parts of the Himalaya, Nilgiri, Ranchi Plateau and
Eastern & Western Ghats. As many as 20 States of India are affected
by different degrees of landslide hazard. Of these, the States of Sikkim
and Mizoram have been assessed to be falling under very high to severe
hazard classes. Most of the districts of the States of Jammu &
Kashmir, Himachal Pradesh, Uttarakhand, Arunachal Pradesh, Nagaland and
Manipur come under high to very high landslide hazard classes. In the
Peninsular Region, the hilly tracts of States like Karnataka, Andhra
Pradesh, Tamil Nadu, Maharashtra, Goa, Madhya Pradesh and Kerala
constitute low to moderate hazard prone zones.
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