8Th Grade Chapter 14 (8) Earthquakes

Front 1

Most of the destruction of an earthquake is caused by what waves?

Back 1

surface waves

Front 2

The point in Earth's interior where energy is released?

Back 2

the focus

Front 3

These waves cause particles in rocks to move at right angles to the direction of the wave?

Back 3

secondary waves

Front 4

An instrument used to record seismic waves is called?

Back 4

seismograph

Front 5

A scientist who studies earthquakes?

Back 5

seismologist

Front 6

When the buildup of stress in Earth's crust is so great that rocks reach their ______ _______ an earthquake occurs

Back 6

elastic limit

Front 7

These forces are generated at covergent plate boundaries?

Back 7

compression forces

Front 8

A reverse fault is often located along what boundary?

Back 8

convergent boundaries

Front 9

The slowest seismic waves are called?

Back 9

surface waves

Front 10

This kind of fault occurs at divergent boundaries?

Back 10

normal fault

Front 11

The San Andreas fault is an example of this type of fault?

Back 11

strike-slip fault

Front 12

This kind of fault occurs at convergent boundaries?

Back 12

reverse fault

Front 13

The force of tension at a divergent boundary cause what type of fault?

Back 13

normal fault

Front 14

These waves cause particles in rocks to move back and forth in the same directions as the waves?

Back 14

primary waves

Front 15

The _________ of an earthquake is the point on EArth's surface above the focus.

Back 15

epicenter

Front 16

This is a seismic sea wave that can cause great destruction?

Back 16

tsunamis

Front 17

This kind of fault occurs at transform boundaries?

Back 17

strike-slip fault

Front 18

The Himalayan mountains contain many of these faults?

Back 18

reverse faults

Front 19

The Sierra Nevada mountains contain these faults

Back 19

normal faults

Front 20

Primary and Secondary waves slow down when they hit the plasticlike________?

Back 20

astehnosphere

Front 21

Seismologists use this scale to describe an earthquake magnitude?

Back 21

Richter Scale

Front 22

These forces at transform fault boundaries cause strike-slip faults?

Back 22

shearing forces

Front 23

Normal faults are created by?

Back 23

tension in the rocks

Front 24

A 8.0 earthquake is how many times greater than a 7.0?

Back 24

32 times greater

Front 25

AT this fault, the rocks about the fault surface are force up and over the rocks below the fault surface?

Back 25

Reverse fault

Front 26

Stress in EArth's crust leads to movement and changes in EArth's lithosphere that result in?

Back 26

earthquakes

Front 27

The measure of energy released by an earthquake is the earthquakes?

Back 27

magnitude

Front 28

Many structures need to be ______ ______ to be able to withstand an earthquake.

Back 28

seimsmic-safe

Front 29

Compression forces push rock in at ________ faults

Back 29

reverse

Front 30

Earthquakes occur when the ______ or rocks is passed.

Back 30

elastic limit

Front 31

Seismic waves move outward from the _______

Back 31

epicenter

Front 32

AT least ______ seismograph stations are needed to located the epicenter of an earthquake

Back 32

3

Front 33

EArthquakes occur when the ____ of rocks is passed

Back 33

elastic limit

Front 34

A ______ fault forms when the rock above the fault surface moves down relative to the rock below the surface

Back 34

normal

Front 35

Seismic waves move outward from the _________.

Back 35

epicenter

Front 36

_______ waves stretch and compress rocks

Back 36

Primary

Front 37

________ waves are the slowest

Back 37

Surface

Front 38

At least______seismograph stations are needed to located the epicenter of an earthquake

Back 38

3

Front 39

Primary waves ______ when they go through solids

Back 39

speed up ????

Front 40

The _____ of a seismograph remains still

Back 40

pendulum

Front 41

An earthquake of magnitude 7.5 has _____ energy than a quake of 6.5

Back 41

32 times more

Front 42

Most lost lives during an earthquake are due to ______

Back 42

collapse of buildings

Front 43

a fault formed due to tension on rocks

Back 43

normal fault

Front 44

fault due to shearing forces

Back 44

strike-slip fault

Front 45

point where earthquake energy is released

Back 45

focus

Front 46

point on EArth's surface directly above the origin of an earthquake

Back 46

epicenter

Front 47

wave that produces the most surface damage

Back 47

surface wave

Front 48

boundary between the crust and mantle

Back 48

Moho discontinuity

Front 49

instrument that records seismic waves

Back 49

seismograph

Front 50

measure of energy released by an earthquake

Back 50

magnitude

Front 51

seismic sea wave

Back 51

tsunamis

Front 52

refers to structures that are resistant to seismic vibrations

Back 52

seismic safe