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Earthquake Measurement. Earthquake Measurement. Locating Earthquakes. Scientists ( Seismologists) use seismographs that are located near the surface of the Earth to record the seismic waves. Epicenter: Is the point on the Earth’s surface directly above an earthquakes starting point.

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Presentation Transcript
locating earthquakes
Locating Earthquakes
  • Scientists (Seismologists) use seismographs that are located near the surface of the Earth to record the seismic waves.
  • Epicenter:Is the point on the Earth’s surface directly above an earthquakes starting point.
slide4
Seismologists use the difference of the arrival times between the P-wave and S-wave to locate the epicenter.
slide5
Seismologists use the readings from three separate seismograph stations.
  • 1 seismic station: Epicenter is anywhere on the distance circle.
  • 2 seismic stations: Epicenter is at one of two points.
  • 3 seismic stations: Epicenter is at one unique point.
earthquakes in the u s a
Earthquakes In the U.S.A
  • U.S.A. earthquakes
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