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Earth Sci - Chap 8
vocabulary
Question | Answer |
---|---|
seismology | the study of earthquakes |
deformation | change in the shape of a rock in response to stress; plastic deformation does not cause earthquakes, elastic deformation does cause earthquakes |
elastic rebound | sudden return of elastically deformed rock to its original shape |
seismic waves | waves of energy that travel through the Earth; seismic waves that travel along the Earth's surface are called surface waves |
P waves | waves that travel through solids, liquids and gases - the are the fastest seismic waves (also called primary waves) |
S waves | seismic wave that causes particles of rock to move in a side-to-side direction - second fastest seismic waves (also called secondary waves) |
seismograph | instruments located at or near the surface of the Earth that record seismic waves |
seismogram | tracing of earthquake motion - created by seismograph |
epicenter | point on Earth's surface directly above an earthquake's starting point (focus) |
focus | point along a fault at which the first motion of an earthquake occurs |
magnitude | measure of the strength of an earthquake; seismologists use the Richter magnitude scale |
intensity | measure of the degree to which the earthquake is felt by people and the amount of damage caused by an earthquake. Seismologists use the Modified Mercalli Intensity Scale to measure |
gap hypothesis | states that sections of active faults that have had relatively few earthquakes are likely to be sites of strong earthquakes in the future. |
seismic gap | areas along a fault where relatively few earthquakes have occurred. |