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A large number of landslides induced by the 2004 Mid Niigata Prefecture earthquake resulted in the closure of 233 segments of national and prefectural routes in Higashiyama mountain district, and 61 localities were completely isolated. Since railway and road facilities follow closely the motion of soils, damage to these facilities has to be discussed in terms of soil deformations that they experienced.The example of Kizawa tunnel shows that even relatively small soil deformations can be large enough to cause serious cracking of tunnel lining. IntroductionThe strong earthquake (M6.8) that hit the inland district of Niigata prefecture on October 23, 2004 was followed by strong aftershocks in rapid succession. The district suffered four jolts with a magnitude of 6 or greater within 38 min after the main shock. A large number of landslides induced by the earthquake in the Higashiyama mountain district resulted in the closure of 233 segments of several prefecture routes and the nationalroute 249, and 61 localities were completely

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