As seismologists gained more experience from earthquake records, it became obvious that the problem could not be reduced to a single peak acceleration. In fact, a full frequency of vibrations occurs.

Its revised edition publiCharles Francis Richterd in 1954 is considered a standard reference in the field. Science 83 (2147): 183–185. 173.

Charles Francis Richter (/ˈrɪktər/; April 26 1900 – September 30 1985) was an American seismologist and physicist. Richter is most famous as the creator of the Richter magnitude scale which until the development of the moment magnitude scale in 1979 quantified the size of earthquakes. The quote "logarithmic plots are a device of the devil" is attributed to Richter.