What are causes and effects of landslides?
What are causes and effects of landslides?
Factors that trigger landslide movement include heavy rainfall, erosion, poor construction practices, freezing and thawing, earthquake shaking, and volcanic eruptions. Landslides are typically associated with periods of heavy rainfall or rapid snowmelt and tend to worsen the effects of flooding.
What landslide caused the most damage?
1. Haiyuan Flows, Ningxia, China, December 1920 (100,000+ deaths)
Why are landslides bad for the environment?
Landslides can overwhelm, and even pollute streams and waterbodies with excess sediment. In extreme cases they can dam streams and rivers, impacting both water quality and fish habitat. Landslides can wipe out large tracts of forest, destroy wildlife habitat, and remove productive soils from slopes.
What happens when a landslide occurs?
In a landslide, masses of rock, earth or debris move down a slope. They develop during intense rainfall, runoff, or rapid snowmelt, changing the earth into a flowing river of mud or “slurry.” They can flow rapidly, striking with little or no warning at avalanche speeds (faster than a person can run).
When was the worst landslide in history?
The worst landslide in U.S. history was in 1928, when as many as 500 people were killed after the collapse of the St. Francis Dam near Los Angeles, according to geologist Lynn Highland of the U.S.Geological Survey.
How does a landslide cause damage or destruction of human lives and property?
In the United States, landslides and debris flows result in 25 to 50 deaths each year. The health hazards associated with landslides and mudflows include: Rapidly moving water and debris that can lead to trauma; Broken electrical, water, gas, and sewage lines that can result in injury or illness; and.
How do landslides affect biodiversity?
Landslides help maintain such natural ecosystem processes as nutrient cycling and may promote biodiversity by the promotion of habitat diver- sity (Geertsema & Pojar, 2007).
How do we make a damage control of 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 among the following human activities can trigger a landslide?
Construction works, legal and illegal mining, as well as the unregulated cutting of hills (carving out land on a slope) caused most of the human-induced landslides.
What are the devastating landslides that happened in the Philippines?
On the 17th of February 2006, a massive rock slide-debris avalanche occurred in the Philippine province of Southern Leyte, causing widespread damage and loss of life….2006 Southern Leyte mudslide.
| Location | Guinsaugon, Saint Bernard, Southern Leyte, Philippines Southern Leyte province Southern Leyte province (Philippines) |
| Casualties |
|---|
When did the La Conchita slide take place how much damage and fatalities were caused?
Introduction. On January 10, 2005, a landslide struck the community of La Conchita in Ventura County, California, destroying or seriously damaging 36 houses and killing 10 people.
What is the worst landslide in US history?
The worst landslide in U.S. history was in 1928, when as many as 500 people were killed after the collapse of the St. Francis Dam near Los Angeles, according to geologist Lynn Highland of the U.S. Geological Survey . National Landslide Information Center in Golden, Colo. There are many types of landslides.
What are the natural causes of landslides?
Natural causes of landslides include earthquakes, volcanic eruptions, the undercutting of cliffs and banks by water erosion due to tidal waves, and the elevation of pore water pressure by prolonged rainfall and seepage. All of these natural causes are influencing factors of landslides.
What is a landslide and what causes one?
The primary cause of a landslide is the influence of gravity acting on weakened materials that make up a sloping area of land. While some landslides occur slowly over time (e.g., land movement on the order of a few meters/yards per month), the most destructive ones happen suddenly after a triggering event such as heavy rainfall or an earthquake.
What are the effects of the landslide?
Landslides can cause seismic disturbances; landslides can also result from seismic disturbances, and earthquake-induced slides have caused loss of life in many countries. Slides can cause disastrous flooding, particularly when landslide dams across streams are breached, and flooding may trigger slides.
