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11 Cards in this Set
- Front
- Back
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What is a Seismograph?
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Device used to record earthquakes. Readings are used to estimate magnitude or size of the earthquake.
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What controls magnitude of an earthquake? ( Area of fault broken)
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1. Geometry of the fault
2. What happens in the rocks seconds after it begins (How strong are the rocks) |
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What is the common scale used?
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Richter Scale
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Are all scales logarithmic? If so, does the energy released increase or decrease and how fast?
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Yes, and energy released increases rapidly
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What is an After Shock?
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aftershock- smaller magnitude earthquakes that persists for days or weeks following the main shock
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What is Liquefaction?
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Conversion of wet sediment to flowing sediment and water. Structures are built on weak sediments like sand boil
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What is Tsunami
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Large, fast moving sea wave usually created by an earthquake whose epicenter is in the ocean
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Where do earthquakes occur?
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Plate Boundaries
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What is a rift zone?
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Large valley bounded by large normal faults
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What are P & S waves?
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body waves that travel through the earth
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What do seismic waves velocity depend on?
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Rock composition, temperature, and density of rock
* Seismic waves speed up with depth in earth |
