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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

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.


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



Earthquakes in the u s a
Earthquakes In the U.S.A seismograph stations.

  • U.S.A. earthquakes


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