Geology Reference
In-Depth Information
FIGURE 6.7
Distinctive landforms and drainage patterns aligned along a strike-slip fault are visible evidence
that fault movement is recent enough to have interrupted the more gradual processes of erosion and deposition.
(Brown and Kockelman, 1983)
San Andreas Fault
Study Figure
6.9,
which is a photo of the San Andreas Fault,
and then answer the questions below. It will help to review
Figure
6.7.
4.
What geological features can be used to identify the loca-
tion of the fault? Outline the fault zone in Figure
6.9.
5.
Does the fault zone consist of a single fracture or several
parallel fractures? What is your evidence?
FIGURE 6.8
Typical geologic features found associated with a
normal fault in mountainous terrain.
3.
Sketch two utility poles on Figure
6.6a,
placing one on
each side of the fault. Use fault diagrams Figure
6.6b
and c,
and determine if the relative motion of the fault blocks in
Question
2
indicates that it is a normal fault or reverse fault.
Explain your reasoning.
6.
In addition to faults, what other natural or human-made
features can create straight lines in topography? Are any of
these features present in this photograph?
7.
Indicate the direction of movement along the fault by
drawing arrows on either side of the fault in Figure
6.9.
