questions and vocab
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| Mercalli scale | scale that expresses the intensity of an earthquake with a roman numeral and a description.
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| P waves | the fastest wave generated by an earthquake and the first to be recorded by a seismograph.
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| earthquakes | the vibration of the Earth's crust
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| S waves | a wave generated by an earthquake by an earthquake and the second to be recorded by seismography.
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| Elastic rebound theory | theory that the rocks that are strained past a certain point will fracture and spring back to their original shape
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| focus | area along a fault at which slippage first occurs, initiating an earthquake. Often located within the lithosphere.
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| Pacific Ring of Fire | Major earthquake zone that forms a ring around the pacific Ocean.
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| fault zone | a group of interconnected faults.
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| seismograph | instrument used to detect and record seismic waves
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| aftershocks | tremor that follows and is smaller than a major earthquake.
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| surface waves | the slowest moving seismic wave and te last to be recorded by a seismograph/.
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| seismic gaps | a zone of rock in which a fault is locked and unable to move and in which no major earthquake has occurred for a long period of time.
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| tsunami | giant ocean wave
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