Writers : Omidi; Nogolsadat; Gharashi
Refference : Geosciences Scientific Quarterly Journal,No.:45-46,P.:48
Publishing Year : 1382

Abstract :

On the basis of Kinematic findings at different scales in Quaternaiy fault zones,and using modem methods of fault slip analysis, Quatemary stress field was reconstructed. Orientation of slip plane, slip vector, principal stresses, shape of stress ellipsoid and angle of internal friction are involved the fault slip analysis. Orientations of σ1,σ2 and σ3 stresses for primary data (nonrotated) were determined as 084°/04°, 232°/82° and 077°/08°respcctively. The shape of stress ellipsoid was defined on the basis of shape factor [R=((σ2-σ3)/(σ1-σ3)] (Angelier, 1975). The R-value for all studied regions was about 0.5 and defonnation type was mainly left lateral transpressional with small reverse components. Such results are evidence of north trending σ1 in the region and northward movement of the crust. The results are in agreement with other methods such as focal mechanisms of earthquakes.

Subject List : Fault , Tension