Seismologists including Akeo Yoshida state that the 1948 Fukui earthquake , a 7.0 Mj earthquake in Gifu Prefecture in 1961 , a 6.6 Mj earthquake in Gifu Prefecture in 1969 , and this earthquake were earthquakes that occurred in a cycle for a little while in the same area
1948 Fukui earthquake
1948 Fukui earthquake
1984 Otaki earthquake