Major Areas :: Disaster Management :: Landslide. The two regions most vulnerable to landslides are the Himalayas and the Western Ghats. The Himalayas mountain belt comprise of tectonically unstable younger geological formations subjected to severe seismic activity.
Where does landslides mostly occur in India?
The major landslide prone areas in India include the Western Ghats and Konkan Hills (Tamil Nadu, Kerala, Karnataka, Goa and Maharashtra), Eastern Ghats (Araku region in Andhra Pradesh), North-East Himalayas (Darjeeling and Sikkim) and North West Himalayas (Uttarakhand, Himachal Pradesh, Jammu and Kashmir).
Are landslides common in India?
Disasters caused by landslides and flooding are common in India during the June-September monsoon season, when heavy rains weaken the foundations of structures that are often poorly built.
Where do landslides occur most often?
Slides can occur in all 50 states, but regions like the Appalachian Mountains, the Rocky Mountains and the Pacific Coastal Ranges have “severe landslide problems,” according to the USGS. The agency lists California, Oregon, Washington, Alaska and Hawaii as especially prone.
Which areas are prone to landslide?
Areas that are generally prone to landslide hazards
- On existing old landslides.
- On or at the base of slopes.
- In or at the base of minor drainage hollows.
- At the base or top of an old fill slope.
- At the base or top of a steep cut slope.
- Developed hillsides where leach field septic systems are used.
Why do landslides occur in India?
India has the highest mountain chain on earth, the Himalayas, which are formed due to collision of Indian and Eurasian plate, the northward movement of the Indian plate towards China causes continuous stress on the rocks rendering them friable, weak and prone to landslides and earthquakes.
Which country has the most landslides?
Countries with the most amount of land at high risk of landslides include Italy, Austria, China, the Philippines and Ethiopia.
How does a landslide start?
Landslides occur when masses of rock, earth, or debris move down a slope. … Mudslides develop when water rapidly accumulates in the ground and results in a surge of water-saturated rock, earth, and debris. Mudslides usually start on steep slopes and can be activated by natural disasters.
Can a landslide be predicted?
To be able to predict landslides, scientists have developed slope stability models to analyze the risk locally. More recently, NASA has created a preliminary algorithm to map landslide hazards globally using satellite measurements of rainfall, land cover and other surface variables.
Are landslides fast or slow?
Landslides are geologic phenomena that can happen suddenly or through imperceptively slow downslope movement. … A “translational” landslide can happen rapidly and result in all of the soil on a hillside being stripped off and filling the area at the bottom of the slope.
How can we prevent landslide?
There are also various direct methods of preventing landslides; these include modifying slope geometry, using chemical agents to reinforce slope material, installing structures such as piles and retaining walls, grouting rock joints and fissures, diverting debris pathways, and rerouting surface and underwater drainage.
Which are the major factors which trigger landslides?
The primary external factors that can trigger a landslide include: (1) weathering of rock strata; (2) increased pore water pressure, such as the infiltration of rainwater or rise of groundwater surface; (3) increased loading by, for example, rainfall, accumulated snow or flourish vegetation; (4) the supporting forces …
How do you survive a landslide?
During an event
- Move away from the threat—don’t approach an active landslide.
- Escape vertically by moving upstairs or even on countertops to avoid being swept away.
- Identify and relocate to interior, ideally unfurnished, areas of a building that offer more protection.
- Open downhill doors and windows to let debris escape.