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Flashcards in Earthquake Deck (24)
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0

What is an earthquake

Vibrations that happen when built up stress is released and rocks slide past eachother under earths surface

1

What is an epicenter

The point on surface directly above earthquake

2

What is the focus ?

Point in earth where earthquake occurred

3

What is an aftershock

Smaller earthquakes that occur after a larger one in the same area

4

P-waves :

Side to side movements.
Move thought rock faster than any othe wave .

5

S-waves

Secondary waves
-up and down movements
Moves slowly

6

Richter scale :

Measures energy released in an earthquake

7

What is an After effect?

Other problems that can occur and cause damage after an earthquake

8

Can S waves travel through liquid?

No.

9

What happens to waves as they travel through different materials in the earth

The bend depending on the material they are passing through

10

Name and describe some after effects.

Fires: broken gas lines leak gas into the air

Tsunami: waves of water that get pushed up when earthquakes happen

Liquefaction: soil and rocks become loose from shaking and are inflated with water causing it to act like liquid.

11

Where do most earthquakes occur?

Focus

12

How many earthquakes can be felt each year by instruments?

Thousands

13

What materials can P waves travel through?

Solids and liquids

14

What type of materials can S waves travel through?

Just solids

15

What two factors impact the speed of waves?

Depth and rock type

16

How fast to P waves travel?

6-13 km/second

17

How fast do S waves travel?

3.5-7.5 km/ second

18

What type of waves show up first on a seismograph

P waves

19

How many seismographs are needed to find the location of an earthquake

3

20

What is magnitude

Total amount of energy released

21

What is the lowest magnitude a person can feel?

2-3

22

What is the magnitude of a strong earthquake

8

23

The most sensitive seismograph can detect a magnitude of -2 which is the equivalence of ...

Stomping your foot on the amount