文档介绍：REGIONAL STRESS REGIMES AND CHINA TECTONICS
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 , 1951)
A Normal fault sets. B Thrust fault sets. C Strike-slip fault sets
Distribution of potential faults from pressive stresses at two ends(After ,1951)
of maximum principal stress of minimum principal stress fault
Distribution of potential faults result from non-uniform
boundary stress (After ,1951)
High Friction Low Friction
Convergent Margin
‘Mega-thrust’
The Velocities of the Tectonic Plates with
respect to the Earth’s center
Plate 1
Plate 2
V1
V2
RMV
Fix Plate 1 by subtracting V1 from itself. Then must also subtract V1 from V2. The result is the relative motion vector of plate 2 with respect to plate 1.
CALCULATE RELATIVE MOTION VECTOR FROM ABSOLUTE PLATE VELOCITIES
Normal Faulting Regime
Reverse Faulting Regime
s1
s1
s3
s3
s2
s2
s2 & s3 are horizontal, s1 is vertical
s1 & s2 are horizontal, s3 is vertical
STRIKE – SLIP FAULTING REGIME
s1
s3
s2
Map
view
s1 & s3 are horizontal, s2 is vertical