Imagen [url=https://commons.wikimedia.org/wiki/User:Benjamin_J._Burger?uselang=es]Benjamin J. Burger[/url]. [url=https://commons.wikimedia.org/wiki/File:How-the-Richter-Magnitude-Scale-is-determined.jpg?uselang=es][i]Escala Richter[/i][/url] ([url=http://creativecommons.org/licenses/?lang=es]CC BY-SA[/url])