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Barnett- Earthquakes
Barnett - Earthquakes
Question | Answer |
---|---|
focus | point within Earth where the earthquake starts |
epicenter | location on the surface directly above the focus |
fault | fractures in the Earth where movement has occurred |
aftershock | movement that follows a major earthquake |
seismograph | instrument that records earthquake waves |
surface waves | seismic waves that travel along Earth's outer layer |
body waves | waves that travel through Earth's interior; include primary and secondary waves |
primary wave | fastest body wave; compressional |
secondary wave | slower than a primary wave; move particles perpendicular to the direction of wave |
moment magnitude | measurement for earthquakes used by scientists; estimates the energy released by earthquakes |
Richter Scale | magnitude scale based on the amplitude of the largest seismic wave; used in most news reports |
tsunami | Japanese word for seismic sea wave |
intensity | measure of damage to the surface and effects on humans |
three | number of seismic stations required to locate an epicenter |
foreshocks | small earthquakes that preceed a major earthquake |