Transcript Rock Faulting 10/12/09

Put your Worksheet on the box
7-4c pgs. 183-184
IN: List and describe
the 3 types of rock
folding.
http://ees.as.uky.edu/sites/default/files/elearning/module10swf.swf
 Fault
– a break in the Earth’s
crust along which blocks of the
crust slide relative to one another
due to tectonic forces.
NAMING FAULTS



When the ground
breaks, sections are
moving with respect
to each other.
The ground above the
fault = Hanging Wall.
The ground below the
fault = Footwall.
 Normal
Faults
 Reverse Faults
 Strike-Slip Faults


Tensional (pulling) stress
Allows the hanging wall to slide down
Compressional (pushing) Stress
 Causes the hanging wall to move up

 Stress 


Shearing (sliding) stress causes one block
to slide past the other horizontally.
Two types – right and left lateral


Stress is still compressional (pushing),
but the fault lies at a low angle.
Now the hanging wall gets pushed up
and over the footwall

http://www.iris.edu/gifs/animations/faults.h
tm

Elasticity of the rock material
 Ductile
material – limestones and
clays
 Brittle material – sandstones and
granites
Amount of stress
 Speed that the stress is applied

OUT:
If a fault occurs in
an area where rock
layers have been folded,
which type of fault is it
likely to be? Why?