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At just about the time that Lehmann was refining our basic understanding of the Earth’s interior by studying the seismic waves of earthquakes, two geologists at Caltech in California were devising a way to make comparisons between one earthquake and the next. They were Charles Richter and Beno Gutenberg, though for reasons that have nothing to do with fairness the scale became known almost at once as Richter's
alone. (It has nothing to do with Richter either. A modest fellow, he never referred to the scale by his own name, but always called it "the Magnitude Scale.")
The Richter scale has always been widely misunderstood by non scientists, though perhaps a little less so now than in its early days when
visitors to Richter's office often asked to see his celebrated scale, thinking it was some kind of machine. The scale is of course more an idea than an object, an arbitrary measure of the Earth’s tremblings based on surface measurements.
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