Figure 3

Fault plane solutions. Fault plane solutions derived in this study (black, blue, red; color coded by their mechanism) and taken from the global CMT catalog and Ghose et al. 1998 (gray) overlaid on a topographic map showing the known tectonic structures of the region. Bars under the fault plane solutions indicate the orientation of the axis of maximum compressional deformation (P axis); arrows indicate velocity field relative to stable Eurasia from GPS data (Zubovich et al. 2010); faults taken from Kalmetieva et al. 2009. Red boxes (a to e) indicate clusters of earthquakes discussed in the text. Inlay: result from stress tensor inversion; bright gray dots show results within a 95% confidence interval and dark gray dots show results within a 68% confidence interval. The best fit is shown by a white triangle for stress axis σ2, a white square for σ3, and the white dot for σ1. The stress inversion was performed using previously known data (Global CMT catalog, Ghose et al. (1998)) and solutions derived in this study (total no. of observations: 109). The derived best-fit stress tensor shows a clear thrust mechanism with well-defined σ2, σ3, and σ1 with a direction of 160°/340°. TFF, Talas-Fergana Fault.