Small scale-fault topography exposed on the slope along the Nojima Earthquake fault

概要

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A series of small-scale fault topographies associated with the Hyogo-ken Nanbu Earthquake were observed along the Nojima Earthquake fault. The results are as follows: (1) Such fault microtopographies as fault scarplets, cracks and a earth rise appeared at the top of the terminal facet consisting of relatively fresh granite. (2) They are recognized on the slope where the Nojima Earthquake fault is not exposed or has become indistinct. (3) Slope collapse is not in evidence, where small-scale fault topographies were formed. (4) Opening cracks were widely recognized, except in the area along a earth rise. (5) Small-scale fault topographies were classified into two groups as follows: relatively large-scale oblique-slip faults, and small-scale normal faults and cracks. (6)Oblique-slip faults show eyebrow or angle in plan view, and the part of the bend or curve corresponds to the highest part. Normal faults are linear. (7) Strikes of oblique-slip faults deviate from 10-40 degrees east of the Nojima Earthquake fault, whereas normal faults strike parallel or conjugate to the oblique-slip fault. (8) The lengths and displacements of small-scale faults were significantly shorter and smaller, respectively, than those of the Nojima Earthquake fault.
Japanese Society for Active Fault Studiesの論文