Abstract
We set up a temporary seismographical network in northern part of Gifu Prefecture, central Japan, and carried out an observation in July and August, 1971.
Only a few hypocenters could be determined in the vicinity of active faults such as Atotsugawa and Atera faults. Whereas other shocks were mainly located in the vicinity of Mt. Yake, south-west side of Mt. Norikura, and in the vicinity of the aftershock region of the earthquake of central part of Gifu Pref. (Sept. 9, 1969). These earthquakes were very shallow, less than 15km in depth.
Aftershocks of the earthquake mentioned above were still active in the same region in the early stage of the aftershock sequence.
