The answer is Ritcher. The Ritcher scale was developed by Charles Ritcher from which it was named after in 1935. The measurement of earthquakes using the Ritcher magnitude scale is based on a logarithmic scale of between 0 and 10. This is measured using a seismogram. In earthquakes of 3.0 and below in magnitude, the shaking is almost undetectable by humans. Magnitude above 8.0, on the other hand, are very powerful and the shockwaves can be visible on the ground.
