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EARTHQUAKES: WHY? AND HOW? EARTHQUAKES: WHY? AND HOW?

EARTHQUAKES: WHY? AND HOW? - PowerPoint Presentation

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Uploaded On 2020-08-07

EARTHQUAKES: WHY? AND HOW? - PPT Presentation

Content Purpose Explore the scientific theory of plate tectonics by describing how the movement of Earths crustal plates causes both slow and rapid changes in Earths surface including volcanic eruptions earthquakes and mountain building ID: 801708

earthquake earthquakes rock scale earthquakes earthquake scale rock fault boundaries magnitude plate surface waves faults force https break richter

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Presentation Transcript

Slide1

EARTHQUAKES:WHY? AND HOW?

Slide2

Content Purpose:

Explore the scientific theory of plate tectonics by describing how the movement of Earth's crustal plates causes both slow and rapid changes in Earth's surface, including volcanic eruptions, earthquakes, and mountain building.

Slide3

What are earthquakes?

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

Slide4

EARTHQUAKES

Slide5

When the force on rocks is great enough, they break, producing vibrations called ____.a. faults c

. strains

b. earthquakes d. stresses

Slide6

Where do they occur?

1.

Plate boundaries

Deepest

earthquakes

=

Convergent boundaries

(think oceanic plates)

Shallow earthquakes = Divergent boundaries (mid-ocean ridges) & transform boundaries (San Andres Fault).

2.

Rock Deformation

Force x Pressure = rock deformation

3.

Faults

A break in Earth’s lithosphere where one block of rock moves toward, away from, or past another.

Slide7

Three types of faults:Strike-slip

Normal

Reverse

See diagram on page 263 of the text book!

Slide8

Along a(n) ____ fault, rock above the fault surface moves downward in relation to rock below the fault surface.a. normal c. elasticb. reverse d. strike-slip

Slide9

PLATE TECTONIC STRESSES

Slide10

EARTHQUAKE WAVES

Slide11

Slide12

EARTHQUAKE WAVES

Slide13

EARTHQUAKE WAVES

Slide14

Question: How might knowing what type of material each wave can penetrate be useful to scientists?

Slide15

Slide16

Slide17

Slide18

Slide19

Slide20

Moment Magnitude

https://

www.youtube.com/watch?v=yNN7eDXzlMo

Slide21

See page 269

“We all got scared and ran outside. The house was ok, but our old shed fell over.” This quote would help a researcher to place an earthquake on which scale?

a. Modified

Mercalli

Scale

c. moment

magnitude scale

b. Richter

Scale

d. all

of the above

The magnitude of an earthquake is measured by the ____.a. Richter scale c. modified

Mercalli

scale

b.

moho

discontinuity d. elastic limit

Slide22

HOW TO READ SEISMOGRAMS

Slide23

Slide24

EARTHQUAKE DAMAGE

Slide25

LIQUEFACTION

Slide26

EARTHQUAKE DAMAGE

Slide27

https://

www.youtube.com/watch?v=yOGoKCK17a4

Slide28

What I Learned Today!

Write a Sum-it-up about what you learned. You may use this

ppt

&/or your text book.

Be sure to use vocabulary terms and examples.