Quiz #21

19 October 2011

S.I. Session 21 Quiz

This quiz covers material from the lecture on Wednesday, October 19^th.

Important figures from this lecture are on p.338-343.

Part a) Match the term to its definition:

                TERMS:

a)Seismograph                  b)Seismograms                 c)Elastic

d)Bedrock                           e)Foreshocks                     f)Aftershocks

g) Recurrence Interval   h)Fault Slip                          i)Earthquakes

                DEFINITIONS:

1)__The distance that an earthquake displaces ground.

2)__In order to record the earth’s movement, the seismograph is attached to this.

3)__These detect and record earthquake ground motions.

4)__The time between the build-up and release of elastic energy at faults, proposed in the elastic rebound theory.

5) __ Seismographs produce these.

6)__These occurs when rocks under stress suddenly fail along a geologic fault.

7)__When a material has this property, then after removing stress from the material it returns to its original shape.

8)__&__ These are smaller earthquakes that precede and follow a large earthquake.

Part b) Name the three factors that cause irregularities in the earthquake cycle:

Part c) True or False:

                Mark T (true) or F (false) in the blank provided:

                                1)__Earthquakes can be predicted.

2)__Rocks under stress deform elastically and then rebound when an earthquake occurs.

3)__Earthquakes occur when rock strength exceeds stress.