Using a  Richter   nomogram  (right; essentially a graph with three axes scaled based on Richter's equations to account for distance from the earthquake epicenter), the magnitude can be estimated by drawing a line from the  distance axis  to the S-wave  amplitude axis  using the values for that seismograph station

Using a  Richter   nomogram  (right; essentially a graph with three axes scaled based on Richter's equations to account for distance from the earthquake epicenter), the magnitude can be estimated by drawing a line from the  distance axis  to the S-wave  amplitude axis  using the values for that seismograph station. Where the line crosses the  magnitude axis  is the Richter magnitude for the earthquake. Again, it is best to use seismograms from at least three seismographs to converge on a single best answer. Determining Richter Magnitude - Tokyo, Japan.   Using the simulated seismogram in the Problem 6 placemark from the Tokyo, Japan seismograph station, determine the  maximum S-wave amplitude  (mm) for the seismogram. a.~100 mm b.~130 mm c.~210 mm