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9 Cards in this Set

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How thick is the crust of the earth?
It is made of several plates, and is about 50 miles thick.
These plates move slowly over theearths molten core. T/F
TRUE. When 2 plates pull apart or rub together, or collide, the result is an earthquake.
What is the hypocenter?
It is the location where the earthquake originates.
What is the epicenter?
It is the point on the earth vertically above the hypocenter.
What are P waves?
Earthquakes produce a variety of waves. These are the first waves, they flow longitudinally like sound waves, compressing and decompressing the ground. They move quickly and can travel across the world in 20 minutes.
What ae S waves?
These travel slowly and transversely, displacing walls and fencing.
What are L waves?
These are the most severe. They cause the ground to move up and down. These cause landslides, and tsunamis.
After shock tremors are the result of the ground settling into place. T/F
TRUE.
What is the Richter scale?
This measures the intensity of the earthquake. Each number is an increase by a factor of 10. A 3.0 is ten times stronger than a 2.0, and is 100 times stronger than a 1.0.. Those below 4.0 are rarely felt.