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  Richter Scale

Seismologists use the Richter scale to express the energy released by an earthquake.

The earth movements during the earthquake are recorded on the seismograph as a diagram like the one below. The amplitude of the wave is used to calculate the magnitude.

amplit_en.gif

 

The measuring scale is a logarithmical one, so a 5 degrees magnitude earthquake is 31 times stroger than a 4 degrees magnitude one.
The graph below shows how many times an earthquake of certain magnitude is more energetic than a 1 Richter degree earthquake. 

magn_en.gif

MERCALLI SCALE
The Mercalli Scale is used to measure the intensity of the earthquake. This intensity varies greatly according to distance from the earthquake, ground conditions, and other factors.


200 Accretion_disk.jpg 

A new scientific truth does not triumph by convincing its opponents and making them see the light, but rather because its opponents eventually die, and a new generation grows up that is familiar with it

Max Plank