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Brittle deformation Joint Tension gash Styloite Fault etc..

Structural geology. Structure. Ductile deformation Fold Foliation Lineation etc. Brittle deformation Joint Tension gash Styloite Fault etc. Fault. Reconstruction of regional stress. Fault surfaces displaying the direction of slip lineation. pitch. pitch.

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Brittle deformation Joint Tension gash Styloite Fault etc..

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  1. Structural geology Structure Ductile deformation Fold Foliation Lineation etc.. Brittle deformation Joint Tension gash Styloite Fault etc.. Fault Reconstruction of regional stress

  2. Fault surfaces displaying the direction of slip lineation

  3. pitch pitch Stereographic projection of a fault slip data set Slickenside lineation Fault plane Fault plane Lower hemisphere project

  4. Method of right dihedrons obtaining the orientation of principal stress axes from statistic method

  5. STEREOGRAPHIC NET S’/S = f (inclination) S’/S = const.

  6. Wuff net Schmidt net

  7. Wuff net (equiangular) OPM isosceles triangle ON/OP = tan (p/4-i/2) ON = R tan (p/4-i/2) Schmidt net (equal-area) ON = OX, OX = (2)1/2 OH OH/OP = sin (p/4-i/2) ON = (2)1/2 R sin (p/4-i/2)

  8. 3D inversion of field data in fault tectonics Eigenvalues and eigenvectors of T give the orientation of principal stress axes (s1 , s2 and s3), as well as the shape ratio F of the stress ellipsoid (F = (s2-s3)/(s1-s3)). (e.g., Angelier, 1979, 1984, 1989, 1990)

  9. Inversion result Computed stress axes Field measured data Theoretical fault shears (Angelier, 1990)

  10. (Chang C. P., Unpubl.)

  11. Example from the seismic focal mechanism F = (s2-s3)/(s1-s3) case 1 0 F 1 case 1 case 2 •  0 reverse and strike-slip case 2 •  1 normal and strike-slip (Kao and Jian, 2001)

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