FactSheet: FS2016-E-0004

Title:
Preliminary report of geotechnical and structural damage along the surface rupture in Nishihara Village caused by the April 16th, 2016 Kumamoto earthquake

Authour:
Takaaki IKEDA¹, Kazuo KONAGAI², Takashi KIYOTA³

1Member of JSCE, Professor, Dept. of Civil and Environmental engineering, Nagaoka University of Technology
2Fellow of JSCE, Professor, Institute of Urban Innovation, Yokohama National University
3Member of JSCE, Associate Professor, Institute of Industrial Science, The University of Tokyo

Key Facts:
・ Hazard Type: Earthquake
・ Date of the disaster: April 16th, 2016
・ Location of the survey: Nishihara village, Kumamoto, Japan
・ Date of the field survey; April 16th to 17th, and April 22th to 25th, 2016
・ Survey tools: GPS receiver

Key findings:
1) Various kinds of structural and geotechnical damage were observed along the surface rupture that appeared along the recognized trace of Futagawa fault in Nishihara village.
2) Status of damage to road bridges has a wide variation, such as fractures of bearing devices and shifts of bridge girders, etc. though there was no report of bridge fall.
3) Slope failures and road settlements were observed at many locations along Futagawa fault line. Ground displacements as well as strong ground motions along the fault rupture must have been responsible for the damage.

Key Words:
The 2016 Kumamoto earthquake, Surface rupture, Structural and Geotechnical damage, Prefectural road 28

Paper: PDF 8,705KB