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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

richter scale!

Earthquake: Seismology information and definition. Magnitude and other units of measurement of the severity of an earthquake by SMS-Tsunami-Warning.com

Differences between P and S waves include wave speeds, types and sizes and travel capabilities. P waves travel faster in a push-pull pattern while the slower S waves travel in an up-down pattern. P waves travel through all materials; S waves only travel through solids. S waves cause more damage,.

Scientists use two scales, The Modified Mercalli Scale and the Richter Scale, to describe the strength of a an earthquake.

Seismometers & Seismographs: Basic principles, how it works, definition, history, Modern instruments

Richter scale reading: 7.8 Modified Mercalli Scale Level: IX (Violent)