Study on Liquefaction Safty of Reclamation Dike in Japan

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I investigated the water area recla-mation projects in Japan after the World War II.Firstly, I explained the institution of water area reclamation projects.Secondly, I classified these projects and made the distribution maps of the projects.From these results, the following was found worthy of being reported :1.Sea coast reclamation projects are concen-trated around Ariake Sea, Yatsushiro Sea, Seto Inland Sea, Ise Bay, Mikawa Bay and Kagoshima Bay where tidal range is remarkable.2.All projects above mentioned except Kagoshima bay belong to alluvial plains.3.Water area reclamation projects at lakes are almost all distributed around large lakes or brackish water lakes, i.e.Lake Shinji, Nakaumi, Lake Biwa, Lake Hamana, Kasumigaura, Imbanuma, Teganuma, Izunuma, Hachirogata, Lake Jusan.4.The total number of the sea coast reclamation projects is more than that of the water area reclamation projects.But the total project area and the tatal reclamation area of the latter are larger than those of the former.Thirdly, I examined seismic hazard of these reclamation dikes using equations of attenuation in detail. Then, I found that these reclamation dikes were allmost all to be investigated upon their liquefaction potential and mentioned that fundamental principle of aseismatic design of these reclamation dikes.