Each number on the Richter scale is TEN TIMES stronger than the lower number. Therefore - in this case, a strength 4 quake is 100 times stronger than a strength 2.
The scale used to measure the strength of an earthquake is called the Richter scale
Richter scale
Richter
richter scale
The richter scale!
Richter
Earthquake
The Richter scale measures the strength of earthquakes. Bulgaria is a country, not an earthquake.
The Richter scale is used to measure the strength of earthquakes.
The moment magnitude scale has replaced the Richter Scale.
The Richter scale does not know anything. The Richter scale is a measurement of the magnitude of an earthquake. The numbers of the scale represent a quantifiable measurement or range of the strength.
Richter Magnitude