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Disaster Prevention Resources
Landslide Preparedness
Previous erosion disaster information is here

When it has continued raining for a long time, be careful of erosion disasters!

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When it has continued raining for a long time, the ground may become soft, and sediment disasters (such as rockslides, landslides, and mudslides.) are more likely to occur.
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Rockslides

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Rockslides occur when the ground becomes soft due to heavy rain or earthquakes, and suddenly collapses. The collapsed rocks and sand may travel 2-3 times the distance of the slope height. Areas prone to rockslides characteristically have more occurances of rockslides than other erosion-related disasters. There are 86,651 such sites across Japan (based on a survey carried out in 1997).
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Rockslides Precursor Phenomena
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  • When small rocks start to fall from cliffs
  • When water starts to seep out of cliffs
  • When cracks form in cliffs
Rockslide precursor phenomena Scattering Trickling Cracks
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Landslides

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A landslide occurs when rainwater, etc., seeps into a loose layer of land, such as clay, in a location with a gentle slope, resulting in the ground moving. A wide damage area, simultaneous damage to houses, fields, paddocks and the traffic network are characteristic of landslides. The movement of a landslide is often invisible, at a few millimeters per day. However, there are instances when the ground suddenly moves a few meters. Also, if river water has been dammed by a landslide, it may cause major disasters downstream when released.
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Landslide Precursor Phenomena
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  • When well water becomes muddy
  • When the ground becomes cracked and part of it
                 subsides or swells
  • When there is a sudden change in the amount of
                 water in ponds or swamps
Landslide precursor phenomena
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Mudslides

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A mudslide occurs where soil and stones collapsed from a valley or mountain surface suddenly, flowing out along with water, usually after a long period of rain during the rainy season or rain from a typhoon. Mudslide disasters often occur where there is a rapidly flowing river or in an alluvial fan, and cause damage with their high speed and power.
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Mudslide Precursor Phenomena
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  • When a rumbling sound is heard from the whole
                 mountain
                 (called “Yamanari” in Japanese)
  • When rivers are muddy or carry driftwood
  • When river water levels decrease, despite
                 continuing rain
Mudslide precursor phenomena
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