Ten years after the development of a local magnitude scale, ML, by Richter (1935), Gutenberg (1945a, 1945b, 1945c) proposed to extend the magnitude concept to measurements of maximum amplitudes of body and surface waves at teleseismic distances. For the first time this made possible comparable estimates of earthquake size on a global scale (Gutenberg and Richter 1949, 1954). In addition, body waves allow magnitude measurements for earthquakes at all depths. Teleseismic magnitudes were originally determined for earthquakes with magnitudes mostly around 6 and larger on intermediate- to long-period displacement-proportional records...

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