花崗岩急斜面に発達するシーティング節理群の形態と卓越方向 : 広島市八幡川地域および呉市東能美島地域を例として

Dips and strikes of sheeting joints developed in steep valleys of granite in Hiroshima, were measured to understand the geometrical relationship between sheeting joints and slopes. The results show low angle sheeting joints tend to have the same direction as the slopes. Dip angle is gentler（10 to 20 degrees）than those of the slopes. The strike of the sheeting joints is also roughly concordant with those of the slope shape.
Considering that no heterogeneous texture exists in the granite, the correspondence mentioned above suggests that these features formed under the influences of the shape of the steep slopes and their formation process. Shear stress due to unsymmetrical pressure within slopes or seismic vibration may form such sheeting joints.