Every year, on April 26, Richter Scale Day is celebrated. This day honors the birth of the inventor of the Richter scale, Charles P. Richter (April 26, 1900 - September 30, 1985).
Richter was an American seismologist and physicist famous for inventing the Richter scale, the scale that quantifies the magnitude of earthquakes. While working at the California Institute of Technology, along with Beno Gutenberg, Richter first used his scale in 1935.
After the Richter scale was published in 1935, it immediately became the standard measure of earthquake strength. There are now more modern methods of measuring the magnitude of earthquakes, but the intensity index is still referred to by the public as the Richter scale.
10 most powerful earthquakes ever recorded:
| Location | Date | Power on the Richter scale |
| Chile | May 22, 1960 | 9.5 |
| Prince William Sound, Alaska | March 28, 1964 | 9.2 |
| Andrinoff Islands, Aleutian Islands | March 9, 1957 | 9.1 |
| Japan | March 11, 2011 | 9.0 |
| Kamchatka | November 4, 1952 | 9.0 |
| The west coast of Sumatra, Indonesia | December 26, 2004 | 9.0 |
| Some distance from the coast of Ecuador | January 31, 1906 | 8.8 |
| Chile | February 27, 2010 | 8.8 |
| Rat Islands, Aleutian Islands | February 4, 1965 | 8.7 |
| North Sumatra, Indonesia | March 28, 2005 | 8.7 |
April 26 is also Chernobyl Memorial Day
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