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]
A Summit Extra Pale sounds good - You only go around once on the list !

Greg
-----Original Message-----
From: Christopher Wright <chrisw(--nospam--at)skypoint.com>
To: seaint(--nospam--at)seaint.org <seaint(--nospam--at)seaint.org>
Date: Tuesday, September 14, 1999 4:17 PM
Subject: Re: Order of magnitude


>>* The biggest earthquakes are (8. x) Righter magnitude and
>>10000x20x1000=2x10^8.  You owe me a beer Chris.
>I think I owe you a recommendation for a beer. You got fairly close 
>because you got fairly lucky. ;-> So try Summit Extra Pale Ale--lip 
>smackin' wonderful.
>
>At your recommendation I ran through the calculations using your 
>correlation and the heat of combustion of TNT (=820.7 Kcal/mol @ 227.12 
>g/mol = 1.37 joules/Ton. 4186 J/Kcal and 10^7 ergs/joule gives a heat of 
>combustion for TNT of 1.37E10 joules/ton) and came up with the following 
>table (Check it out with a monospaced font like Courier):
>
>Magnitude   Energy       Equivalent
>           (joules)      Tons of TNT   Log(Ton)
>4         6.31E+10             5        0.66
>4.5        3.55E+11            26        1.41
>5          2.00E+12           145        2.16
>5.5        1.12E+13           818        2.91
>6          6.31E+13          4598        3.66
>6.5        3.55E+14         25858        4.41
>7          2.00E+15        145410        5.16
>7.5        1.12E+16        817702        5.91
>8          6.31E+16       4598276        6.66
>8.5        3.55E+17      25858009        7.41
>
>
>You get fairly close for the strong earthquakes but the agreement gets 
>worse for weaker ones. The hooker is the 11.8 term in the magnitude 
>correlation which affects the proportionality. Enjoy that Summit, but 
>don't forget that the Richter scale isn't defined by an energy release 
>rate but by a standardized seismograph reading.
>
>
>
>
>Christopher Wright P.E.    |"They couldn't hit an elephant from
>chrisw(--nospam--at)skypoint.com        | this distance"   (last words of Gen.
>___________________________| John Sedgwick, Spotsylvania 1864)
>http://www.skypoint.com/~chrisw
>
>