Happy Birthday to the Richter Scale inventor: It's National Richter Scale Day - CBS Los Angeles

The Richter Scale measures quakes in a range from 0 to 9. On the scale, each increase in number represents an earthquake 10 times more powerful.

National Richter Scale Day (April 26th)

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Charles Richter was born on this - Educational Innovations

April 26th is Richter Scale day, celebrating the birthday of

Today's celebration: National Richter Scale Day

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Charles Richter was born on this - Educational Innovations

It's National Richter Day! On this day in 1900 Charles Richter