Earthquake measurement
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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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Earthquake Measurement

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Earthquake measurement

Earthquake Measurement

Earthquake Measurement


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.


Focus is the point directly inside the earth where the earthquake begins

Focus: is the point directly inside the Earth where the earthquake begins.


Earthquake measurement

Seismologists use the difference of the arrival times between the P-wave and S-wave to locate the epicenter.


Earthquake measurement

  • 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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