Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

Re: Order of magnitude

[Subject Prev][Subject Next][Thread Prev][Thread Next]
>The Richter scale is based on the equivalent energy in tons of TNT.  So a 
>7 on the Richter scale means 1X10^7 tons of TNT.
For what it's worth (could win you a bar bet some day) The Richter scale 
is an arbitrary one based on a standard (Richter's standard) seismometer 
amplitude at a distance of 100 km from the epicenter. According to 
'Nuclear Reactors and Earthquakes' the biggest earthquakes release energy 
equivalent to 10000 20 kiloton nuclear bombs. The 1906 San Francisco 
quake release was about 10^16 joule. 

I think I need to get out of the office more often...

Christopher Wright P.E.    |"They couldn't hit an elephant from
chrisw(--nospam--at)        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)