Abstract
On March 20, 2005, an earthquake of magnitude 7.0, which was named as the 2005 Fukuokaken-seiho-oki earthquake, occurred at the northwest part of Fukuoka City. During the earthquake, liquefaction took place mainly in the reclaimed lands of the Hakata Bay area and caused structural damage. In this paper, the distribution of the sites where liquefaction occurred and the characteristics of the grain size of sand boils collected at the sites were clarified. Further, the occurrence of liquefaction in the reclaimed land was discussed with reference to some instances, and the structural damage was summarized. Furthermore, liquefaction analysis was performed using a program called “SHAKE,” and several soil profiles of the reclaimed land and alluvial ground in order to investigate the relationship between the occurrence of liquefaction and the distribution of acceleration, which was estimated from earthquake response analyses and the mechanical and physical properties of the soils.
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