On Wed, Jan 06, 2016 at 07:47:02AM -0800, Rayzer wrote:>This is interesting.
>nato and UN are uneasy, they want all the bombs for themselves:
>http://www.telegraph.co.uk/news/worldnews/asia/northkorea/12084087/North-Korea-hydrogen-bomb-Kim-Jong-un-earthquake-live.html
>UN Security Council meets to discuss the world's response as leaders
>urge for "strong action" to be taken against Pyongyang following H-bomb
>test which caused 5.1 magnitude earthquake - follow live updates

The Richter scale is logarithmic:  A "Magnitude 0" earthquake is defined as a ground motion of 1 micron (10E-6 meters) 100 kilometers away from the epicenter.  Magnitude 1 means 10 microns motion, Mag 2 means 100 microns motion, etc. (I don't know if "motion" is described as "Peak-to-peak" or RMS, root-mean-square).  Energy goes up by a factor of about 31 for a magnitude increased by one unit.

       Jim Bell