Q1. Complete the listric fault upto the detachment level using vertical shear with constant heave
Q2. Measure the detachment depth from the regional in inches/cm
Vertical shear with constant heave – Chevron method
Regional

1.Construct a regional line from tip of fault to the end of the profile (point where there is no
displacement of the footwall)
2.Measure the heave (h) from the first hanging wall cutoff
3.Divide regional line by vertical lines of constant spacing h
4.Displacement vectors are drawn from the regional to the hanging wall (B to B’, C to C’ and so on)
5.The displacement vectors are translated along vertical shear planes to touch the tip of the
unfinished fault plane
6.The line segment between the shear planes marks the fault plane.
7.Complete the fault plane till it flattens to the detachment
8.Smoothen the constructed plane by drawing a free-hand curve
Construction

A1. Fault plane constructed
A2. Detachment depth from regional is 6.5 cm (in A4 paper)
Solution
Detachment

Q1. Complete the listric fault upto the detachment level using 35° (from vertical) antithetic shear
Q2. Measure the detachment depth from the regional in inches/cm
Inclined shear
Regional

Construction
1.Construct a regional line from tip of fault to the end of the profile (point where there is no
displacement of the footwall)
2.Measure 35° from vertical, and let the line pass through the first hanging wall cut-off
3.Mark distance h’ at the intersection of the 35° line and the regional
4.Divide regional line by vertical lines of constant spacing h’
5.Displacement vectors are drawn from the regional to the hanging wall (B to B’, C to C’ and so on)
6.The displacement vectors are translated along inclined shear planes to touch the tip of the
unfinished fault plane
7.The line segment between the shear planes marks the fault plane.
8.Complete the fault plane till it flattens to the detachment
9.Smoothen the constructed plane by drawing a free-hand curve

A1. Fault plane constructed
A2. Detachment depth from regional is 4.1 cm (in A4 paper)
Solution
Detachment