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Landslide Preparedness
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
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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
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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
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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
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When river water levels decrease, despite
continuing rain
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Previous erosion disaster information is here
When it has continued raining for a long time, be careful of erosion disasters!
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.
スペーサー
Rockslides
スペーサー
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).
スペーサー
Rockslides Precursor Phenomena
スペーサー
スペーサー
スペーサー
スペーサー
- When small rocks start to fall from cliffs
- When water starts to seep out of cliffs
- When cracks form in cliffs
スペーサー
スペーサー
スペーサー
スペーサー
スペーサー
Landslides
スペーサー
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.
スペーサー
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
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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
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