what is a standard earthquake
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The Richter scale is based on a standard measurement: an earthquake that can be felt 100km away with amplitude of 1mm is given a magnitude measurement of 3.0. This is the base measurement and all other measurements of magnitude are made to this reference.
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earthquake) and S is the intensity of a ''standard earthquake'' (whose amplitude is 1 micron =10-4 cm). The magnitude of a standard earthquake is. Richter studied many earthquakes that occurred between 1900 and 1950.
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