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Ch6 Sec3

Ch6 Sec3. Monitoring Earthquakes. Key Concepts. How do seismographs work? How do geologists monitor faults? How are seismographic data used?. Key Terms. Seismogram Friction . Ch6 Sec3. The Seismograph

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Ch6 Sec3

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  1. Ch6 Sec3 Monitoring Earthquakes

  2. Key Concepts • How do seismographs work? • How do geologists monitor faults? • How are seismographic data used?

  3. Key Terms • Seismogram • Friction

  4. Ch6 Sec3 • The Seismograph • Seismic waves cause the seismograph’s drum to vibrate. But the suspended weight with the pen attached moves very little. Therefore, the pen stays in place and records the drum’s vibrations. • Seismogram: is the record of an earthquakes seismic waves produced by a seismograph

  5. Ch6 Sec3 • Instruments that Monitor Faults • To monitor faults geologists have developed instruments to measure changes in elevation, tilting of the land surface, and ground movements along faults • Tiltmeters • Creep Meters • Laser-Ranging Devices • GPS Satellites

  6. Ch6 Sec3 • Using Seismographic Data • Seismographic and fault-monitoring devices provide data used to map faults and detect changes along faults. Geologists are also trying to use these data to develop a method of predicting earthquakes • Friction: is the force that opposes the motion of one surface as it moves across another surface

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