**Measuring Earthquake Magnitude**

**Richter Scale -**- The Richter magnitudes are based on a logarithmic scale (base 10). What this means is that for each whole number you go up on the Richter scale, the amplitude of the ground motion recorded by a seismograph goes up ten times.
- Using this scale, a magnitude 5 earthquake would result
in
**ten times**the level of ground shaking as a magnitude 4 earthquake (and**32 times**as much energy would be released)

**Earthquakes: TNT vs. Earthquake Example**- Seismologists use a separate method
to estimate the
**effects**of an earthquake, called its**intensity**.