How earthquakes are measured?

2 ANSWERS

1. Guest7012
   

    The measuring mechanism of earthquakes are many. depending upon different technologies.

   
   

   generally a seismometer replacing the outdated term seismograph but other instruments may also respond to an earthquake.The simplest example of a seismograph is a pendulum.

   
   

   
   
   
   
   

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2. Guest8433
   

   The magnitude of most earthquakes is measured on the Richter scale, invented by Charles F. Richter in 1934. The Richter magnitude is calculated from the amplitude of the largest seismic wave recorded for the earthquake, no matter what type of wave was the strongest.
   
   • 2.5 Or less magnitude of an earthquake is usually not felt, but can be recorded by seismograph and about 900,000 such earthquakes happen each year.
   
   • Earthquakes of 2.5 to 5.4 magnitudes are often felt, but only cause minor damage. About 30,000 such earthquakes happen each year around the world.
   
   • 5.5 to 6.0 magnitude earthquakes cause slight damage to buildings and other structures and 500 such earthquakes are observed around the world per year.
   
   • About 100 earthquakes of 6.1 to 6.9 magnitudes are observed each year and they may cause a lot of damage if happen in very populated areas.
   
   • 7.0 to 7.9 magnitudes are the serious damage causing earthquakes and 20 such earthquakes are observed each year across the world.
   
    

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