REGIONAL STRESS REGIMES AND CHINA TECTONICS
REGIONAL STRESS REGIMES AND CHINA TECTONICS
REGIONAL STRESS REGIMES (ANDERSON THEORY OF FAULTING) lo, is located parallel to the fault plane, normal to the direction of slip/ l o3 is located normal to o, and o2/ Earth's surface is a principal plane ofstress Ideal fault geometry 3 stress regimes: Normal, Thrust, Strike-slip
REGIONAL STRESS REGIMES (ANDERSON THEORY OF FAULTING) • [s2 is located parallel to the fault plane, normal to the direction of slip] [ s3 is located normal to s1 and s2 ] • Earth’s surface is a principal plane of stress • Ideal fault geometry • 3 stress regimes: Normal, Thrust, Strike-slip
Fault orientation in relation to principal stress axes (After EM.Anderson, 1951) A Normal fault sets. B Thrust fault sets. C Strike-slip fault sets
Fault orientation in relation to principal stress axes (After E.M.Anderson, 1951) A Normal fault sets. B Thrust fault sets. C Strike-slip fault sets
1234 B Distribution of potential faults from uniform compressive stresses at two ends(After W Hafner, 1951) 1. Stress 2.Trajectories of maximum principal stress 3. Trajectories of minimum principal stress 4 Potential fault
Distribution of potential faults from uniform compressive stresses at two ends(After W.Hafner,1951) 1.Stress 2.Trajectories of maximum principal stress 3.Trajectories of minimum principal stress 4.Potential fault
1234 Distribution of potential faults result from non-uniform boundary stress(After W Hafner, 1951
Distribution of potential faults result from non-uniform boundary stress (After W.Hafner,1951)