Definition Of Landslide Hazard

Landslide the movement downslope of a mass of rock debris earth or soil.

Definition of landslide hazard. The full definition of a landslide hazard areas can be found in scc 30 91l 04. Landslides are a type of mass wasting which denotes any down slope movement of soil and rock under the direct influence of gravity. Vulnerability to landslide hazards is a function of location type of human activity use and frequency of landslide events. The effects of landslides on people and structures can be lessened by total avoidance of landslide hazard areas or by restricting prohibiting or imposing conditions on hazard zone activity.

A homeowner s guide to landslides pdf where are landslide hazard areas. Landslide landslide landslide mitigation and prevention. Introduction to landslide hazard zonation definition of landslide sudden mass movement of soil is called landslide. These are further subdivided by the type of.

One clue to the location of future landsliding is the distribution of past movement so maps that show the location and size of landslides are helpful in predicting the hazard for an area. Landslides pose a recurrent hazard to human life and livelihood in most parts of the world especially in some regions that have experienced rapid population and economic growth. The factors that have been used for landslide hazard analysis can usually be grouped into geomorphology geology land use land cover and hydrogeology. The term landslide encompasses five modes of slope movement.

Since many factors are considered for landslide hazard mapping gis is an appropriate tool because it has functions of collection storage manipulation display and analysis of large amounts. Landslides occur when gravitational and other types of shear stresses within a slope exceed the shear strength resistance to shearing of the materials that form the slope. Click the image to the right for a larger version. Landslide hazard is a function of susceptibility spatial propensity to landslide activity and temporal frequency of landslide triggers and its assessment may be done on local individual slope regional national continental or even global scales.

Bring out the causes for more frequent landslides in the himalayas than in western ghats. Hazards are mitigated mainly through precautionary means for instance by restricting or even removing populations from areas with a history of landslides. Landslide hazard area illustration pdf a homeowner s guide to landslides. The most appropriate method in each scale depends on the.

Landslides occur in hill areas due to instability of land mass due to loose soil excessive water moisture. Landslide inventory maps show landslide locations and might show the dimensions and geographical extent of each landslide. Falls topples slides spreads and flows.