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Shimada, Koji
no journal, ,
In this preliminary study, more objective discrimination between orientations of small crush zones was carried out by means of directional statistics. Fitted number of mixture components of von Mises distribution is eight. A probability distribution function curve of eight components mixture shows two peaks. Crush zones principally depict dextral sense of shear along the system beta, and sinistral one along the system alpha-3. Plastically deformed biotite grains are observed in both crush zones. Deformation temperature of them seems to be higher. Statistically comparable development, nearly orthorhombic symmetry, and cross cutting relationship between the two systems suggest the development of crush zones in conjugate manner. This movement picture is inconsistent with continuing E-W shortening during late Quaternary. These lines of evidence suggest that crush zones observed at the site of Monju are old geologic structure.
Shimada, Koji; Goto, Akira; Sasaki, Akimichi*; Terusawa, Shuji*; Komatsu, Tetsuya
no journal, ,
We tried an objective expression of directional distribution of lineaments utilizing the directional statistics for the high interpretability. Directional statistics of lineaments at the shear zone in southern Kyushu indicate that the length weighted directional distribution of lineaments are decomposed into five von Mises distributions. An objective extraction of the East-West lineament concentration ereas was concordant with qualitative understanding by means of rule of thumb, judgement at a glance or rose-diagram.