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17 Cards in this Set
- Front
- Back
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What are the causes of earthquakes? |
Sudden failure of rocks within the lithosphere, caused by a build up of pressed and a sudden release of this pressure |
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What is the Focus of an earthquake? |
The point of failure within the lithosphere |
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What is the Epicentre of an earthquake? |
The point directly above the focus |
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How deep is a shallow Focus? |
0-70km (75%) |
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How deep is an intermediate Focus? |
70-300km |
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How deep is a deep Focus? |
300-700km |
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What are primary waves? |
Fastest type of wave, Vertical movement, Will reflect, Travel fastest through solid but also travel through liquid |
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What are secondary waves? |
Waves that move at right angles to the surface, will reflect, will travel through a solid but not a liquid |
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What are surface waves? |
Love waves Rayleigh waves |
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What are Love waves? |
Love waves displace the ground vertically |
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What are Rayleigh waves? |
Rayleigh waves roll along the surface layers |
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What is a Seismometer? |
Measures seismic waves |
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What is the Richter scale? |
Measures energy released by an earthquake |
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What is the Moment Magnitude Scale? |
Measures energy released by an earthquake |
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What is the different between these two? |
MMS is used as opposed to the RS for higher intensity earthquakes as the RS becomes inaccurate |
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Why is the RS more useful? |
Its useful in determining the intensity of earthquakes below 3.5 on the RS |
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What is the Mercali Scale? |
A subjective scale according to the effects on people |
