article: Richter scale
links: 2005 Kashmir earthquake WWII Mercalli intensity scale 2008 Lincolnshire earthquake Charles Richter Chicxulub crater 1976 Tangshan earthquake Tsar Bomba 1989 Loma Prieta earthquake Chernobyl accident Great Chilean Earthquake 1906 San Francisco earthquake 2008 Sichuan earthquake 2010 Haiti Earthquake 1960 Valdivia earthquake 2004 Indian Ocean earthquake 1985 Mexico City earthquake Yucatán Peninsula Bomb Toba catastrophe Fat man Rhodes Good Friday Earthquake Trinitrotoluene Moment magnitude scale 2011 Sendai earthquake and tsunami