RICHTER (NOT ANDY)
'(<a href="http://www.j-archive.com/media/2009-06-02_DJ_27.jpg" target="_blank">Sarah of the Clue Crew shows a graph on the monitor.</a>)  In seismic data, the maximum displacement of a seismic wave during one oscillation--here, 23 millimeters--is referred to by this term'
amplitude