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18 Cards in this Set
- Front
- Back
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Primary wave
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1st wave to arrive at a recording station. travels really quick and are known as compressional waves in which rocks vibrate back and forth parallel to the direction os wave propagation
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Compressional waves can travel
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through solids, liquids, and gases. The more dense the faster
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Secondary wave
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2nd wave to arrive. vibrates perpendicular. CAN ONLY PASS THROUGH SOLIDS
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Earthquakes occur...
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along plate boundaries.
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Epicenter
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the geographic location on the earth's crust directly above the focus
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Earths Crust
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Solid (1st layer)
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Mantel
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Plastic (2nd layer)
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Outer Core
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Liquid (3rd layer)
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Inner Core
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Solid (very center)
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earths core temperature is equal to...
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the sun
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Refractured waves
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Bent waves
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P- Wave shadow zone...
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is ALWAYS beginning 103 from focus until 143
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S-wave Shadow
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From 103 until 103; the entire bottom of the earth will not receive as S-wave
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Other means of measuring an earthquake
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Mercalli Scale & Richter Scale
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Mercalli scale
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scaled based off what people say. from 1-12
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Richter Scale
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1-10 scale. 1 is weakest 10 is most severe. based on log10, meaning 8 is 10k times more sever than a 4
(will never see a 9 or 10 b/c rock breaks before pressure can get that high) |
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This scale is based on how much tonnage of TNT that would need to be exploded to get the same measurement
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Richter Scale
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Core of earth is
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Iron & Nickel
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