Seismic Flashcards by Sophia Stewart

Q

Crust

A

25-50k, less dense, outer layer

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Q

mantle

A

magma (liquid)

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Q

Outer core

A

liquid metal area, currents

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Q

inner core

A

solid metal, high degrees + pressure

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Q

Primary seismic wave

A

long, fastest, minute, initial tremors, all mediums

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Q

Secondary seismic wave

A

trans, slower, major tremors, solids

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Q

Surface waves

A

slowest, crust, most damage

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Q

Earthquake

A

generated in crust as shock waves

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Q

How to detect an earthquake

A

seismometer

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Q

Focus

A

point of earthquake origin

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Q

Epicentre

A

point on surface closest to focus

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Q

Deeper into earth . . .

A

Denser, more refraction

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Q

Where do S not pass?

A

the outer core = shadow zone

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Q

Why do P cut into S shadow zone?

A

refract across boundaries

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Q

How do we know the outer core is liquid?

A

no tremors detected in areas

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Q

How do we know the middle is solid?

A

P refracts through the inner core into S shadow zone

Q

How do we know the crust is curved?

A

Change in S speed