Geology 3263
Structural Geology
Homework Ch 8 – Faults
This homework is for the lecture marked “Chapter 8 Faults” in topic
folder 8.
1. In a normal fault, the hanging wall is
a. up
b. down
2. As a fault slips, minerals on the surface of the two blocks
smear and form lineartions. These give the net slip vector, a
combination of magnitude and direction measured in the
plane. The Rake (aka pitch) angle,  , is the angle these
lineations make with the strike, where
a.  is measured in the plane of the fault.
b.  is measured in the horizontal plane.
3. In a reverse fault, the hanging wall is up. A reverse fault with
a shallow dip is called a
a. transform fault
b. thrust fault
4. The fault shown is a
a. right lateral oblique
b. left lateral oblique
5. Normal Faults are most common in
a. convergent margins
b. divergent margins
c. transform margins
6. Sag ponds are most common in
a. convergent margins
b. divergent margins
c. transform margins
7. Extensional faulting occurs most in
a. convergent margins
b. divergent margins
c. transform margins
8. Contractional faulting occurs most in
a. convergent margins
b. divergent margins
c. transform margins
9. These are symbols for a
a. normal fault
b. thrust fault
c. transform fault
10.
In these symbols, the barbs point to the hanging wall,
which is
a. in the direction the fault dips
b. opposite the direction the fault dips
11.
This symbol is for a
a. normal fault
b. thrust fault
c. transform fault
12.
In this symbol, the barbs point to the hanging wall,
which is
a. in the direction the fault dips
b. opposite the direction the fault dips
13.
This symbol is for a
a. normal fault
b. thrust fault
c. transform fault
14.
Net-slip and separation are the same.
a. True
b. False
15.
A nappe is a body of rock thrust faulted from its
original position.
a. True
b. False
16.
A klippe is the remnant portion of a nappe after
erosion has removed connecting portions of the nappe.
a. True
b. False
17.
Strike-slip faults along a tranform margin can bend
where they are pushed together or pulled apart.
a. True
b. False
18.
Fault displacement decreases as the fault length
increases.
a. True
b. False
Hint: look at the displacement along x-x’
19.
Deeper than about 10 km, faults zones are typically
a. Breccia
b. Cataclasite
c. Mylonites
20.
In Anderson’s theory, faulting occurs on a plane where
shear is much greater than friction. Friction is proportional
to normal stress. The greatest 1 and least 3 stresses are
both horizontal for
a. normal faults
b. thrust faults
c. strike-slip faults
21.
The Hubbert-Rubey Hypothesis accounts for large
thrust sheets (nappes) with
a. high pore pressure
b. high temperature