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Earth Planets Space, Vol. 54 (No. 8), pp. 861-870, 2002

Local site amplification and damage to wooden houses in Shimoenoki, Tottori, Japan, by the 2000 Western Tottori Earthquake

Koji Matsunami1, Takeshi Morii2, Yuka Okamoto2, and Teizo Fujiwara2

1Disaster Prevention Research Institute, Kyoto University, Kyoto 611-0011, Japan
2School of Environmental Science, University of Shiga Prefecture, Hikone 522-8533, Japan

(Received January 17, 2002; Revised July 26, 2002; Accepted July 29, 2002)

Abstract: The degree of damage to wooden houses in the vicinity of the source area of the 2000 Western Tottori Earthquake was very low compared to the 1995 Hyogo-ken Nanbu Earthquake. Shimoenoki in Hino Town, however, suffered remarkable damage compared to other villages, particularly to residential wooden houses. Furthermore, although Shimoenoki is a small area of only 300 400 m2, the damage varied markedly from the foot of the mountains through central Shimoenoki to the Hino River. From the damage distribution based on a survey of all wooden houses, the local site-amplification characteristics estimated from aftershock records, and the transfer functions of wooden houses evaluated using microtremors, the spatial variation of damage appears to be attributed to the variation in site-amplification factors at frequencies between 2 and 5 Hz, which is close to the first natural frequency of wooden houses.


Corresponding author E-mail: matunami@egmdpri01.dpri.kyoto-u.ac.jp


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