Fig. 8
From: Frictional strength of North Anatolian fault in eastern Marmara region
Results of regional stress tensor analysis for the Çınarcık basin earthquakes, based on the P- and T-axes of the focal mechanisms described in the text: a the histogram of R-values, b the distribution of the predicted principal stress axes and their 95 % confidence regions and c the distribution of the observed P- and T-axes. In b, red dots show the azimuth and plunge of the maximum stress axis σ 1, blue circles those of the minimum stress axis σ 3 and green triangles those of the intermediate stress axis σ 2. In c, red dots show the P-axes and blue circles the T-axes. Black symbols denote the axes for the best stress model. For the region, the best fit was attained for R = 0.5 and for the azimuth and plunge pair of (154°, 14°) for σ 1, (289°, 70°) for σ 2 and (60°, 13°) for σ 3, respectively