Landslides
A landslide is a rapid, downslope movement of Earth materials that occurs when a relatively thin block of soil, rock, and debris separates from the underlying bedrock. A landslide mass eventually stops and becomes a pile of debris at the bottom of a slope, sometimes damaging in rivers and causing flooding. Landslides are common on steep slopes, especially when soils and weathered bedrock are fully saturated by water.
A rockslide is a type of landslide that occurs when a sheet of rock moves downhill on a sliding surface. During a rockslide, some blocks of rock are broken into smaller blocks as they move downslope. Often triggered by earthquakes, rockslides can move large amounts of material.
A rockslide is a type of landslide that occurs when a sheet of rock moves downhill on a sliding surface. During a rockslide, some blocks of rock are broken into smaller blocks as they move downslope. Often triggered by earthquakes, rockslides can move large amounts of material.
The deep-seated landslide on the mountain in Sehara, Kiho, beside of Kumano river between Wakayama and Mie Japan caused by torrential rain of Tropical Storm Talas in 2011.
Avalanches
Avalanches are landslides that occur in mountainous areas with thick accumulations of snow. Radiation from the Sun can melt surface snow,which then refreezes at night into an icy crust. Snow that falls on top of this crust can eventually build up, become heavy,slip off, and slide downslope in a rapid movement as an avalanche. Avalanches can happen in early winter when snow accumulates on the warm ground.the snow contact with the warm ground melts, then refreezes into layer of jagged, slipper snow crystals.
Avalanches of dangerous size occur on slope angles between 30 degrees and 45 degrees. When the angle of a slope is greater the 45 degrees, enough snow cannot accumulate to create a large avalanche. At angles less than 30 degrees, the slope is not steep for snow to begin sliding
Avalanches of dangerous size occur on slope angles between 30 degrees and 45 degrees. When the angle of a slope is greater the 45 degrees, enough snow cannot accumulate to create a large avalanche. At angles less than 30 degrees, the slope is not steep for snow to begin sliding