What was the impact of landslides occurred due to earthquake plz its urgent
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The impact of a landslide can be extensive, including loss of life, destruction of infrastructure, damage to land and loss of natural resources. Landslide material can also block rivers and increase the risk of floods. When earthquakes occur on areas with steep slopes, many times the soil slips causing landslides. Furthermore, ashen debris flows caused by earthquakes can also trigger mass movement of soil. Heavy Rainfall: When sloped areas become completely saturated by heavy rainfall many times landslides can occur.
Landslides, in and of themselves, constitute a major geologic hazard. They are widespread, result in $1-2 billion in damages, and cause more than 25 fatalities each year. Landslides are frequently triggered by strong ground motions. They are an important secondary earthquake hazard.
The term landslide includes a wide range of ground movement, such as rock falls, deep failure of slopes, and shallow debris flows. Gravity acting on a steep slope is the primary reason for all landslides, but there are a number of other contributing factors:
• erosion by rivers, glaciers, or ocean waves create oversteepened slopes
• rock and soil slopes are weakened through saturation by snowmelt or heavy rains
• excess weight from accumulation of rain or snow, stockpiling of rock or ore, from waste piles, or from man-made structures may stress weak slopes to failure and other structures
Earthquakes and volcanoes contribute significantly to the landslide hazards:
• earthquakes create stresses that make weak slopes fail
• earthquakes of magnitude 4.0 and greater have been known to trigger landslides
• volcanic eruptions produce loose ash deposits, heavy rain, and debris flows
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