Earthquake Flashcards

0
Q

What is an epicenter

A

The point on surface directly above earthquake

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1
Q

What is an earthquake

A

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

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2
Q

What is the focus ?

A

Point in earth where earthquake occurred

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3
Q

What is an aftershock

A

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

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4
Q

P-waves :

A

Side to side movements.

Move thought rock faster than any othe wave .

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5
Q

S-waves

A

Secondary waves
-up and down movements
Moves slowly

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6
Q

Richter scale :

A

Measures energy released in an earthquake

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7
Q

What is an After effect?

A

Other problems that can occur and cause damage after an earthquake

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8
Q

Can S waves travel through liquid?

A

No.

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9
Q

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

A

The bend depending on the material they are passing through

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10
Q

Name and describe some after effects.

A

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.

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11
Q

Where do most earthquakes occur?

A

Focus

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12
Q

How many earthquakes can be felt each year by instruments?

A

Thousands

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13
Q

What materials can P waves travel through?

A

Solids and liquids

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14
Q

What type of materials can S waves travel through?

A

Just solids

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15
Q

What two factors impact the speed of waves?

A

Depth and rock type

16
Q

How fast to P waves travel?

A

6-13 km/second

17
Q

How fast do S waves travel?

A

3.5-7.5 km/ second

18
Q

What type of waves show up first on a seismograph

A

P waves

19
Q

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

A

3

20
Q

What is magnitude

A

Total amount of energy released

21
Q

What is the lowest magnitude a person can feel?

A

2-3

22
Q

What is the magnitude of a strong earthquake

A

8

23
Q

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

A

Stomping your foot on the amount