ch. 21 vocab
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| seismology | the study of earthquakes.
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| fault | a break in the Earth's crust along which blocks of the crust slide past each other.
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| potential energy | energy that an object has because of its position or shape.
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| kinetic energy | the energy of motion.
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| elastic rebound | the process by which rock that has been deformed by stress suddenly returns to its original shape.
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| seismic waves | are waves of energy that travel through the earth, away from an earthwuake in all directions.
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| p waves | travel through solids, liquids, and gases and are the fastest seismic wave. also the first primary wave.
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| s waves | aka shear waves, are the 2nd-fastest seismaic wave. also is the 2nd seismic wave. secondary.
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| surface waves | seismic waves that move the ground surface up and down in circles as they travel.
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| seismographs | instruments that record seismic wavess and are located at or near the surface of the earth.
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| seismogra | a tracing of ground motion created by a seismograph.
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| epicenter | the point on Earth's surface directly above an earthquake's starting point.
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| s-p time method | seismologists find an earthquake's epicenter .
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| earthquake hazard level | a measure of how likely it is tahta an earthwuake will happen in a certain area.
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| frequency | how often something happens.
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| gap hypothesis | states that parts of active faults that have had relatively few earthquakes are places where strong earthquakes will happen in the future.
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| seismic gaps | the parts of a fault where relatively few earthquakes have happened.
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