Question

What are the causes for landslide?​

Answer 1

Answer:

landslide can cause heavy destruction to human beings, as it can harm a huge amount of properties, people can get injured, etc..

Answer 2

⚠️ ANSWER

☆ Natural causes of landslides include:

● saturation by rain water infiltration, snow melting, or glaciers melting;

● rising of groundwater or increase of pore water pressure (e.g. due to aquifer recharge in rainy seasons, or by rain water infiltration);

● increase of hydrostatic pressure in cracks and fractures;

● loss or absence of vertical vegetative structure, soil nutrients, and soil structure (e.g. after a wildfire – a fire in forests lasting for 3–4 days);

● erosion of the top of a slope by rivers or sea waves;

● physical and chemical weathering (e.g. by repeated freezing and thawing, heating and cooling, salt leaking in the groundwater or mineral dissolution);

● ground shaking caused by earthquakes, which can destabilize the slope directly (e.g., by inducing soil liquefaction) or weaken the material and cause cracks that will eventually produce a landslide;

● volcanic eruptions;

☆ Landslides are aggravated by human activities, such as:

■ deforestation, cultivation and construction;vibrations from machinery or traffic;

■ blasting and mining;

■ earthwork (e.g. by altering the shape of a slope, or imposing new loads);

■ in shallow soils, the removal of deep-rooted vegetation that binds colluvium to bedrock;

■ agricultural or forestry activities (logging), and urbanization, which change the amount of water infiltrating the soil.