Exam 9: Crustal Deformation

Name two landforms or distinctive landscape features that mark the trace of the San Andreas Fault.

A thrust fault is best described as ________.

Name two geologic processes which can produce structural domes?

The 1976 failure of the Teton (clay-earthfill)Dam in Idaho was due water flow in fractured and jointed volcanic bedrock beneath the dam.

Most earthquakes involve the release of brittle energy that was stored up gradually between earthquake cycles.

Broad downwarps in the basement rock may deform the overlying sedimentary cover strata to generate large elliptical to circular folds called ________.

On the blanks provided below, write the name of the specific feature that has been labelled. What kind of fold is this? d)______________________________

What kind of stress creates most fold belts?

Rock salt or limestone is the weakest naturally occurring solid substance to exhibit ductile behaviour?

When an overturned fold lies on its side it is called ________.

When folding occurs, rocks situated in the hinges (on the axes)of the folds are ________.

Which one of the following is consistent with deformation by folding?

________ are the products of horizontally directed, tensional stresses.

While weaker rocks like shale or rock salt will fracture or flow when subjected to stresses, harder rocks like granite, quartzite and peridotite rarely deform.

How wide is the San Andreas Fault Zone at its northern and southern ends?

The entire length of the San Andreas Fault has moved during one or more major earthquakes in the last 50 years.

Weak differential stresses which are unable to deform solid rock initially, may still cause rock to flow like putty if applied for a sufficiently extended period of time.

What kind of faults occur where the crust is being compressed?

A deeply eroded, structural basin would exhibit ________.

Most crustal deformation occurs in active tectonic zones ________.