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In this paper the mathematical model (Double Couple) of earthquake is explained. The coordinates from P—, T— and B-Axes for 106 earthquakes are drown on maps and the mathematical expectations are compared with the tectonics of region. The results are as follows:
1) The P—axes are perpendicular to the fold or mountain—chain of region and they conformed to north—east, south—west direction. These axes are nearly horizontal.
2) For region Kermanshah to Meshed and for the region north—west the T—axes are along the mountain—chain. The B—axes do not show any distinct direction.
3) The B—axes from the north—west region are along the mountain—chain.
4) The P—, and T—axes make an angle about 45° with the faults.
5) The mathematical model agree with the tectonics of region.