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Niwa, Masakazu; Ishimaru, Tsuneari; Kurosawa, Hideki; Shimada, Koji; Moriya, Toshifumi*; Takahashi, Kazuharu*
no journal, ,
It is suggested that fracture zones formed by fault activities have an effect on hydrologic feature of surrounding rocks. Spatial distribution and features of fracture zones in surveyed areas are informative for site selection and design of geological repositories. Here we show a case study in the Atotsugawa Fault, northern Gifu Prefecture. Field mapping in the study area indicates that the number of fracture zone is sharply reduced, and width of each fracture zones falls within 2 m, with distance of more than 500 m from the surface trace of the Atotsugawa Fault.
Ishimaru, Tsuneari; Shimada, Koji; Niwa, Masakazu; Kurosawa, Hideki; Kosaka, Hideki*
no journal, ,
Hydrogen gas measurements have been carried out in active faults, for assessments of fault activities or earthquake prediction. Recently, Shimada et al. (2008) invented the new method by use of a portable hydrogen gas monitor, allowing measurements in many localities over a short amount of time. We examine the applicability of this method to understanding the feature of fractures as a conduit-barrier system and their linkage with active faults. In this presentation, we show a case study of the measurements in the Atotsugawa Fault, Gifu Prefecture.