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Asamori, Koichi; Umeda, Koji; Negi, Tateyuki; Ninomiya, Atsushi
no journal, ,
no abstracts in English
Yasue, Kenichi; Doke, Ryosuke*
no journal, ,
The developing process of the active fault system is useful for estimating the crystal deformation during the last few million years. This study clarified the spatial and temporal evolution of faulting in the Atera fault belt in the west-central Japan (WCJ) from the both viewpoints of geomorphology and geology. On the basis of a started ate of present faulting style, the evolution of faulting in the belt suggests northwestward shift of activated fault domain during the last few million years. In addition, we discussed the started age of present faulting style of other active faults in the WCJ by the same method as the Atera fault belt. As a result, active fault belts in the northern part tend to be younger than fault belts in the southern part.
Matsuoka, Toshiyuki; Hodotsuka, Yasuyuki; Ishigaki, Koichi*; Lee, C. H.*
no journal, ,
We carried out R-VSP using vibrations caused by blasting for the shaft excavation and drilling of the borehole investigation in the horizontal research galleries of the MIU, and examined the applicability of this method to imaging of geological structures around underground facilities, such as boundary between sedimentaly rocks and basal granite, fault and fracture zone in basal granite. As the results, the reflective events that seemed to correspond with sedimentary layers, the unconformity between sedimentaly rocks and granite, and fracture zone in granite could be confirmed by reflection profiles using the conventional VSP data processing and Seismic interferometry. From data processing by Image Point transform, the distribution of three faults, that are correspondent with the current geological model constructed from investigation data in the MIU project, could be detected.
Takeuchi, Ryuji; Oyama, Takuya; Matsuoka, Toshiyuki; Saegusa, Hiromitsu; Takeuchi, Shinji
no journal, ,
In Phase II of the Mizunami Underground Research Laboratory Project, field investigations have been carried out. For hydrogeological investigations, hydraulic pressure, surface tilt and self-potential monitoring have been also carried out in order to obtain information of change of groundwater flow due to construction of the MIU facility around the MIU area. By multiple lines of evidence obtained by some kinds of monitoring in Phase II, the existence of the NNW-trending fault which is predicted from the Phase I investigations.
Sawada, Atsushi; Sato, Hisashi
no journal, ,