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Landslides and slope collapse triggered by Tyuetsu offshore Earthquake (July 2007)
A number of landslides and slope collapse were confirmed after the earthquake of  magnitude 6.8 hit Tyuetsu offshore on 16 th July, 2007 (seismic intensity: 6-high). Officially requested by Niigata Prefecture, Landslide Team investigated totally 4 landslides on 19th July in Kashiwazaki City and advised how to install countermeasures.
Landslide　 - Kashiwazaki Yoneyama - 
Landslide 　- Kashiwazaki Omigawa -
Landslide crack　　- Kashiwazaki Banjin - 
Landslide crack　 - Kashiwazaki Nishiminato -  

　

*　The numbers mentioned below may change following further investigation.
Landslide 　 - Kashiwazaki Yoneyama -　　　　　　　　　　　　　                    （19th Jul 07）

Landslide. Width: 60 m, Length: 110 m, Height: 60 m, Scarp is about 20m in height. 

Main scarp.

Debris deposited at the middle of the slope.

Debris deposited at the toe of the landslide.

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Landslide　- Kashiwazaki Omigawa -　　　　　　　　　　　　　　　　　　　            （19th Jul 07）

Landslide. Width: 65 m, Length: 45 m, Height: 35 m

Debris deposited on the railroad.

Water was leaking out on the surface

Crack at the top of the slope

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Landslide crack　　- Kashiwazaki Banjin -                                           （19th Jul 07） 

Crack at the top of the slope （Length 30m、Width 20cm）　

The retaining wall is toppling in encircled areas.

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Landslide crack　　- Kashiwazaki Nishiminato - 　　　　　　　　　                  （19th Jul 07）

　

Step of 40 cm in height at the top of the slope.

Crack on the grating crib works.

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Landslide Research Team, Erosion and Sediment Control Research Group, Public Works Research Institute
ＴＥＬ ： +81-29-879-6787、 FAX ： +81-29-879-6729
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