National Richter Scale Day is observed annually on April 26th. This day honors the birth of the Richter Scale inventor, Charles F. Richter (April 26, 1900 – September 30, 1985). Richter was an American seismologist and physicist most famous as the inventor of the Richter magnitude scale, which quantified the size of earthquakes. While working at the California Institute of Technology, with Beno Gutenberg, Richter first used the scale in 1935. #richterscaleday
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