Lesson 4

Question 1

is the shaking of the surface of the Earth, resulting from the sudden release of energy in theEarth’scrustthat createsseismic waves.

Answer 1

earthquake

Question 2

is afaultthat is likely to become the source of another earthquake sometime in the future.

Answer 2

active fault line

Question 3

Geologists commonly considerfaultsto beactiveif there has been movement observed or evidence of seismic activity during the last _____years

Answer 3

10,000

Question 4

It is the total energy released at the earthquake’s point of origin which is below the earth’s surface.

Answer 4

magnitude

Question 5

Not felt. Detected only by sensitive seismographs under favorable conditions

Answer 5

Magnitude 1

Question 6

Hardly perceptive. Detected by seismographs

Answer 6

Magnitude 2

Question 7

“Very feeble”. Felt only near the epicenter

Answer 7

Magnitude 3

Question 8

“Feeble” generally felt but dont usually cause any damage

Answer 8

Magnitude 4

Question 9

“Moderate” earthquake –May– cause local damages

Answer 9

Magnitude 5

Question 10

“Strong” earthquake. —Usually— cause local damages

Answer 10

Magnitude 6

Question 11

“Major”earthquake. Causes considerable widespread damages; maybe accompanied by surface rupture and tsunami

Answer 11

Magnitude 7

Question 12

“Great” earthquake. Potentially devastating

Answer 12

Magnitude 8

Question 13

Rare earthquake . only 5 recorded since 1900

Answer 13

Magnitude 9

Question 14

Is the perceived strength of an earthquake based on the relative effect to people and structures on the earth’s surface.

Answer 14

Intensity

Question 15

Scarcely perceptible-perceptible to people under favorable circumstances

Answer 15

Intensity 1

Question 16

Slightly felt- Felt by few individuals at rest indoors

Answer 16

Intensity 2

Question 17

Weak-Felt by many people indoors especially in upper floors of buildings

Answer 17

Intensity 3

Question 18

Moderately Strong -Felt generally by people indoors and by some people outdoors

Answer 18

Intensity 4

Question 19

Strong -Generally felt by most people indoors and outdoors

Answer 19

Intensity 5

Question 20

Very Strong- Many people are frightened

Answer 20

Intensity 6

Question 21

Destructive -Most people are frightened and run outdoors

Answer 21

Intensity 7

Question 22

Very Destructive -People are panicking

Answer 22

Intensity 8

Question 23

Devastating -People are forcibly thrown to the ground

Answer 23

Intensity 9

Question 24

Completely Devastating -practically all man made structures are destroyed

Answer 24

Intensity 10

Question 25

Is caused by the passage of seismic waves beneath structures.

Answer 25

ground shaking

Question 26

Is the displacement of the ground due to the violent shaking of the surface.

Answer 26

Ground rupture

Question 27

occurs when one side of the ground goes up or down or both.

Answer 27

vertical displacement

Question 28

is a lateral movement from side to side.

Answer 28

horizontal displacement

Question 29

Takes place when there is an increase in water pressure in saturated soils because of ground shaking.

Answer 29

liquefaction

Question 30

is a form ofmass wastingthat includes a wide range of ground movements, such asrockfalls, deep failure ofslopes, and shallowdebrisflows.

Answer 30

landslide

Question 31

The lowering of the land surface occurs for many reasons, such as the extraction of ground water, mining, and earthquake.

Answer 31

ground disturbance

Question 32

Is the series of large waves resulting from the disturbance of the sea water commonly due to an earthquake.

Answer 32

tsunami