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Landslides and slope collapse triggered by Noto Peninsula Earthquake (March 2007)

A number of landslides and slope collapse were confirmed after the earthquake of  magnitude 6.9 hit Noto Peninsular on 25 th March, 2007 (seismic intensity: 6-high). Officially requested by Ishikawa Prefecture, Landslide Team investigated totally 6 landslides on 28th March and 6th April in Wajima City and advised how to install countermeasures.
Slope collapse  - Machino, Haseno Domon - 
Landslide   - Fukami -
Landslide crack - Monzen, Kaiso - 
Landslide crack   - Monzen, Fukami -
Landslide  - Monzen, Fukami - 
Landslide  - Monzen, Ono -

 

* The numbers mentioned below may change following further investigation.
Slope collapse  - Machino, Haseno Domon -               (28th Mar 07)
Distorted rock shed  Looking down from the collapsed site. The rock shed of the left photo is seen in the middle left. 
Collapsed area (encircled). Width: 50 m, height: 20 m, approx. The area was highly weathered and colourd brown. The block collapsed was supported by the solid gray rocks in the lower half of the photo.  Some cracks still exist near the collapsed site.
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Landslide  - Fukami -                                             (28th Mar 07)

Collapse occurred in the landslide (V=2,000m3

An unstable block with cracks is still seen in the upper slope.(encircled area). Scarp is about 10 m high. 

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Landslide crack  - Monzen, Kaiso -                                                 (28th Mar 07)

Landmass sunk about a meter over 30 m length at the top of the landslide. 

 

Damaged anchors on the landslide. The blue plastic cover of the left photo is seen in the upper left. 

Damaged concrete frames installed on the landslide

Enlarged photo of a damaged anchor (photo above) 
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Landslide crack   - Monzen, Fukami -                        (6th Apr 07)

Arrow indicates a crack stretching about 20m. The crack forms steps at some places (height: 0-40 cm)

Step seen along the crack

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Landslide   - Monzen, Fukami -                             (6th Apr 07)

Landslide (encircled by a broken line). A large boulder was also found on the road (circled, see the photo below).

Landslide. Scarp is about 20m in height. An unstable block still exists on the right side of the slope. Water was leaking out in encircled areas.

Crack on the ridge line. Width is >1.0m. 

Crack in the middle of the slope. Rock fall was frequent.

A large boulder found on the road. Debris deposited at the toe of the landslide.
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Landslide  - Monzen, Ono -                        (6th Apr 07)

Landslide. A crack was found along the area covered by blue plastic sheet. The landslide partly collapsed (encircled by a broken line) in the area of 40m in width and 50m in length. 

Collapsed area
Scarp of the collapsed area (H: 8m).

 

Step of 20 cm in height at the top of the slope (under blue plastic cover).

Collapsed surface. Slope is 42°. Scratches paralleling to the surface were also found.
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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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