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Abstract

In the early morning of Sep. 26, a huge earthquake, which named "2003 Tokachi-oki earthquake" had stricken to the eastern coast of Hokkaido Island. This earthquake caused serious damage to roads, dikes , lifelines as well as harbor facilities. The significant damage of quay walls was found in the wharf No .4 in the western port of Kushiro. This paper aims to examine the process of seismic damage which occur to the gravity type quay walls of the wharf No.4 in the western port of Kushiro. Field survey to measure the deformation of gravel backfill behind concrete caisson and numerical simulation of seismic response on the damaged quay walls were conducted. And the causal factor and process of seismic damage to quay walls were discussed.