Aratozawa landslide

Aratozawa landslide

LCI : JPN1607070918
Main Information
Landslide Name : Aratozawa landslide
Latitude : 38:53:40 N
Longitude : 140:51:43 E
Location
City / District : Kurihara
Province : Miyagi
Country : Japan
Reporter
Reporter 1 : Ha Nguyen Duc
Reporter 2 : Hendy Setiawan
Landslide Type
Material : Complex
Movement : Slide
Velocity (mm/sec) : -
Depth (m) : Very Deep
Slope (degree) : Almost Flat
Volume (m³) : Very Large
Date of Occurence
Date of Occurence : Jun 14, 2008
Other Information
Land Use Source area : Forest
Run-out/deposition area : Forest, Sea/lake
Other Activity : -
Triggering Factor : Earthquake
Death(s) & Missing : -
Houses and other structural damage : -
Photo of landslide : Azw landslide.JPG
Google earth kmz file : Aratozawa.kmz
Plan of landslide : -
Cross section of landslide : -
Reference (paper/report) : http://link.springer.com/chapter/10.1007978-3-319-04999-1_64
Testing graph : Aratozawa_Testing graph.JPG
Monitoring graph : -
Video of moving landslides including 3D simulation : -
Description :

A huge landslide, namely Aratozawa, was triggered by the Miyagi-Iwate inland earthquake with magnitude 7.2 on 14 June 2008. This translational block glide of deep and large-scale landslide occurred at an upstream section of Aratozawa Dam in Kurihara city, Miyagi Prefecture, Japan. The catchment area of the Aratozawa is around 20.4 km2 and the designed water storage capacity is approximately 14,130 thousand m3.The size of the Aratozawa landslide is around 1300 meters long and 900 meters wide. The thickness of the landslide ranges from 70 meters to 150 meters and the gradient is about 3°. This landslide seems to be the biggest landslide occurring in Japan in the last 100 years. The total volume of the landslide was assessed to be around 67 million cubic meters. By using 3.0 MPa undrained dynamic loading ring shear apparatus ICL2 to analyze the mechanism of the landslide, the effect of groundwater fluctuation and the inter-linkage with the reservoir in the Aratozawa dam was found to be the main causes in addition to the peak ground acceleration of more than 1,000 gal. This report referred the research in the paper: Hendy Setiawan, Kyoji Sassa, Kaoru Takara, Toyohiko Miyagi, Hiroshi Fukuoka, and Bin He (2014). The simulation of a deep large-scale landslide near Aratozawa dam using a 3.0 MPa undrained dynamic loading ring shear apparatus. World Landslide Forum 3, at Beijing, China