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10 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What is an Earthquake? |
A vibration in the rocks of the crust and upper mantle due to the sudden movement of rocks along a fault. |
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What is a seismic wave? |
It is a wave that travels through the Earth |
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What are the three rock properties which affect the velocity of a seismic wave? |
1. Rigidity - more rigid = faster 2. Incompressibility - more incompressible = faster 3. Density - more dense = slower |
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The outer cores rigidity =? |
0 |
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Why is there an S wave shadow zone? |
S waves stop at the Gutenberg as liquid have 0 rigidity |
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L (surface) waves |
Travel just below the Earth's surface and cause damage to buildings. |
Where do they travel? What do they damage? |
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Define the Focus of an Earthquake? |
The point within the Earth where the Earthquake originates from. |
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Focus depths for; shallow, intermediate and deep? |
Shallow: 0-70km Intermediate: 70-300km Deep: 300-700km |
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Define the epicentre of an earthquake? |
The point on the Earths surface directly above the focus |
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How to correctly find the epicentre? |
Isoseismal lines that join up points of equal intensity. The epicentre is located in the centre of the area of greatest intensity. |
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