三河地震における深溝断層の延長部について
1972 年 25 巻 1 号 p. 44-55
詳細
1972 年 25 巻 1 号 p. 44-55
The western extension of the Fuk6zu fault associated with the Mikawa earthquake in 1945 was investigated by the present geological survey. It was ascertained that the extension of the fault has begun near the pass between the villages, Kiriyama and Miyabasama and has been followed as far as Shikoyamachi, Nishio city, a total distance of about 9km. As the result of this survey a total length of the earthquake fault formed by the Mikawa earthquake in 1945 became about 28km as shown in Fig. 3. The fault is of a reverse type, and it has manifested itself as a northeastward upthrusting of the land on the southwest side of the fault amounting up to about 1.8m.
The fault also may presumably continue to the northwest and further to the Nobi earthquake fault which was formed in 1891, based on the seismological standpoint. It is concluded that a number of destructive earthquakes in the past might occur in connection with a chain of faults such as the Fukui, the Nobi, and the Mikawa earthquake fault.
