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The instrument to record the intensity of Earthquake is
1. Physiograph
2. Seismograph
3. Cardiograph
4. Barograph

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Correct Answer - Option 2 : Seismograph
 

Earthquake:

  • The earthquake is a form of energy of wave motion transmitted through the surface layer of the earth. 
  • The instrument used for recording earthquakes is known as a seismograph. 
  • The network of seismographic stations all over the world records dozens of earthquakes every day. 
  • The point within the earth’s crust where an earthquake originates is called the focus.
  • It is also referred to as seismic focus. 
  • It generally lies within the depth of 60 kilometres in the earth crust. 
  • The point vertically above the focus on the earth’s surface is known as ‘epicentre’. 
  • These earthquake waves originating from the focus travel in all directions.
  • But their intensity is the highest at the epicentre.
  • That is why the maximum destruction occurs at and around the epicentre. 
  • The intensity of vibrations decreases as one moves away.

Thus, the instrument to record the intensity of the Earthquake is a sesimograph.

Barograph:

  • Barograph is a barometer that records the barometric pressure over time in graphical form used to make a continuous recording of atmospheric pressure. 
  • It was invented by Lucien Vidi in 1844.

Cardiograph:

  • Cardiograph is an instrument that graphically registers movements of the heart.

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