Abstract
Due to noticeable subsidence of ground occurred in the wide area of the Tohoku district caused by the 2011 off the Pacific coast of Tohoku Earthquake, necessary measures including level raising of quay walls were undertaken. Long-lasting post-seismic crustal movement is affecting fishing port facilities: several years after the main shock, quay walls became too high for fishermen due to the increased ground elevation associated with recovery from the crustal movement, thus, quay wall lowering construction followed the level raising construction. During the reconstruction, continuation of fishing was an important issue. One method for resolving the problem was step-by-step recovery of the fishery quay walls, which was effective for areas where immediate ground elevation occurred after the subsidence during the main shock. In order to obtain beneficial knowledge for the next predicted mega subduction-zone earthquake, such as Nankai Trough earthquake, this study carried out hearing survey with local governments and with those concerned with the fishing industry. Special note should be made of the involvement of high accuracy geodetic data (GEONET data) provided by the Geospatial Information Authority of Japan as well as corresponding recovery process of the fishing port facilities in this study.
