Earth science 8.2

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  • 1.  Instrument that records earthquake waves.
  • 2.  Modern seismograms amplify and electronically record ground motion, producing a trace.
  • 3.  Also called L waves, are seismic waves that travel along Earth’s outer layer.
  • 4.  Push pull waves. Compress and expand rocks in the direction the wave travels.
  • 5.  Shake particles at right angles to their direction of travel.
  • 6.  Derived from the amount of displacement that occurs along the fault.
  • 7.  A seismogram shows all three types of seismic waves- surface waves, P waves, and S waves
  • 8. Travel- time graphs from three or more seismographs can be used to find exact location of an earthquake epicenter.
  • 9.  Historically, scientists have used two different types of measurements to describe the size of an earthquake- intensity and magnitude
  • 10.  Moment magnitude is the most widely used measurement for earthquakes because it is the only magnitude scale that estimates the energy released by earthquakes.