7-4c pgs. 183-184

IN: List and describe the 3 types of rock folding.

Put your Worksheet on the box

http://ees.as.uky.edu/sites/default/files/elearning/module10swf.swf

FaultFault – a break in the Earth’s – a break in the Earth’s crust along which blocks of the crust along which blocks of the crust slide relative to one crust slide relative to one another due to tectonic forces.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) stressTensional (pulling) stress Allows the hanging wall to slide Allows the hanging wall to slide

downdown

Compressional (pushing) StressCompressional (pushing) Stress Causes the hanging wall to Causes the hanging wall to

move upmove 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.htm

Elasticity of the rock materialDuctile 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?