Assignment 8- Crustal Deformation

Which fault will see the hanging wall move down relative to the footwall?

Normal Fault

What are rocks below and above a fault called?

the footwall below and the hanging wall above

Alluvial fans are composed of material built up from sediment from the foot of the mountains to the valley floor. They are evidence that __________.

Death Valley is a tectonically active region

The split cinder cone along the Southern Death Valley Fault is evidence that __________.

the Pacific and North American plates are moving alongside each other along strike-slip faults

What is a scarp?

the trace of a fracture called a normal fault, where a portion of crust slides down the fault surface

Which of the following is an example of how rocks will respond to compressional stress? (Note: there may be more than one correct answer.) Check all that apply.

-folding -reverse faulting

Which of the following scenarios best describes the deformation that will occur in different parts of the crust?

Brittle deformation is dominant in the shallow crust; ductile deformation is dominant in the deep crust.

The Basin and Range consists of north-south trending mountain ranges separated by basins. What causes this distinct topography?

Extension due to normal faulting causes valley floors to sink.

__________ faults combine elements of strike-slip and dip-slip motions.

Oblique-slip

What kind of force would create the fault in Figure 1?

Shear*

Which type of force is responsible for reverse fault formation?

compressional force

What is a fault?

folds along which rocks move

What kind of fault is visible in Figure 1?

right-lateral strike-slip fault*

Which type of force is responsible for normal strike-slip formation?

shear force

Which type of fault has NO vertical motion of rocks associated with it?

strike-slip fault

Which tectonic stress will result in a lengthening of the crust?

tension

Which type of force is responsible for normal fault formation?

tensional force