海底断層の調査と実績 : 青函トンネルF-50について

概要

論文の詳細を見る
Submarine geological surveys in the area of the seikan tunnel have being carried out from 1946, by various methods, dredging of sea bottom, sonic logging, seismic survey, under sea drilling and the others. The geological structure of this area is shown at Fig. 1, 2, 3. Sea bottom contains so many faults at which are various fracturs and cruched rocks, that water is the nearest from the shore of Hokkaido have been excavated excavated at 1969 in the Yoshioka (Hokkaido site of Seikan tunnel) research tunnel. From conclusion of various surveys, we assumed F-50 would be 50 m in width in research tunnel and practically it was 100 m in width. But structures of F 50 were almost collect.
一般社団法人日本応用地質学会の論文
1969-12-01