Earthquakes

Question 1

Earthquakes:

Answer 1

are the vibrations in the ground that result from the movement along breaks in Earth’s lithosphere.

Question 2

Fault:

Answer 2

is a fracture in the lithosphere where one block of rock moves toward, away from, or past another.

Question 3

Stress:

Answer 3

the force exerted when an object person on, against, or pulls away from another object

Question 4

Seismic Waves:

Answer 4

the energy waves that travel as the vibrations caused by earthquakes

Question 5

Focus

Answer 5

the point underground where rocks first begin to move.

Question 6

Epicenter

Answer 6

the point on Earth surface directly above the focus

Question 7

Primary Waves:

Answer 7

fastest wave, first to reach any location after earthquake. Particles of material are pushed together and pulled apart.

Question 8

Secondary Wave

Answer 8

travel half as fast, second wave to reach a location. Particles are shaken up, down, side to side, These waves can not travel through liquids

Question 9

Surface Waves

Answer 9

Travel the slowest, Cause greatest ground movement and damage

Question 10

Seismograph

Answer 10

a device that constantly records movement of the ground.

Question 11

Magnitude

Answer 11

amount of energy released by an earthquake

Question 12

What seismic wave causes the most damage?

Answer 12

Surface

Question 13

In triangulation, seismologists use ___ seismometers

Answer 13

3

Question 14

Strike Slip Fault:

Answer 14

Transform boundary, two blocks of rocks slide past each other

Question 15

Reverse Fault:

Answer 15

Convergent boundary, rocks go upward

Question 16

Normal Fault:

Answer 16

Divergent boundary, rocks go down

Question 17

Most earthquakes occur:

Answer 17

Along plate boundaries

Question 18

The total energy released by an earthquake is best measured by the ___ scale:

Answer 18

Modified Mercalli scale

Question 19

What have scientists learned more about by studying earthquakes?

Answer 19

Composition and structure of Earth’s interior

Question 20

The magnitude of an Earthquake is measured by the __ scale

Answer 20

Richter Scale

Question 21

Primary waves __ when they hit the liquid outer core

Answer 21

Slow down

Question 22

Secondary waves __ when they hit the liquid outer core

Answer 22

Stop

Question 23

Earthquake risk is based on land’s:

Answer 23

History

Question 24

The damage done by an earthquake is measured by the ___ scale

Answer 24

Modified Mercalli