[Noisebridge-discuss] Earthquake magnitude

girlgeek girlgeek at wt.net
Fri Jan 6 16:13:58 UTC 2012


Don't worry too much about your first earthquake.  What is the average 
number of people hurt or killed by cars or muggers on Valencia St. each 
year as compared with the number of people who fall into chasms caused 
by earthquakes on Valencia St. each year.   The major damage that I saw 
after Loma Prieta(?) earthquake was in the marina district to which I 
offer this technical thesis...

http://www.youtube.com/watch?v=YdsKu21hV4I&feature=related 
<http://www.youtube.com/watch?v=YdsKu21hV4I&feature=related>

-Claudia

On 1/5/2012 8:40 AM, Tony Longshanks LeTigre wrote:
> Sorry, I diverged from the thread topic there - I've retitled this 
> message to mark a new thread.
>
> If anyone will write a brief synopsis / nutshell weaving together the 
> Entscheidungsproblem, Computational Complexity Theory and the 
> Church-Turing Theorem (and /or Church-Turing thesis) that I could 
> include in ZiP#1, much obliged.....my plate is full.
>
>
> On Thu, Jan 5, 2012 at 8:11 AM, Tony Longshanks LeTigre 
> <anthonyletigre at gmail.com <mailto:anthonyletigre at gmail.com>> wrote:
>
>     On Thu, Jan 5, 2012 at 7:20 AM, Joshua Juran <jjuran at gmail.com
>     <mailto:jjuran at gmail.com>> wrote:
>
>
>         I know the perfect song for that.  It's great -- it starts with an
>         earthquake...
>
>
>
>     Funny you should say that.
>
>     I'm writing something right now for ZiP Issue One on the logarithm
>     used to calculate earthquake magnitude. There is a lot of general
>     public misinfo / ignorance on this subject. Many people, and even
>     many media outlets, think quake magnitude increases by a simple
>     factor of 10 for each full number you go up the scale, when in
>     fact - correct me if wrong - an increase in one number represents
>     32 times more energy, and an increase of two full numbers equals
>     almost 1,000 times as much energy released (900 and something).
>     Meaning there is a huge difference between a 4.0 and a 6.0
>     magnitude earthquake. A 4.0 you might barely feel, while a 6.0 is
>     big enough to, excuse the language, Seriously Fuck Shit Up. The
>     1994 Northridge quake only had a moment-magnitude of 6.7; Loma
>     Prieta 6.9 - but then there's the surface wave
>     magnitude.....that's of greatest import to us humans. It's
>     complicated. But I'm so into it!
>
>     Any other earthquake aficionados / seismology geeks in the house?
>     It's one of my choice topics. If I make any noticeable
>     contribution to hacking I would like it to be seismology related;
>     i.e., a way to increase our accuracy in earthquake prediction.
>
>     Also, everyone still says Richter Scale but my understanding is
>     it's not widely used these days and is not accurate for measuring
>     large earthquakes (above 7.0 or so). Moment magnitude seems to be
>     most widely used these days, in my experience. Can anyone confirm
>     / deny / elaborate?
>
>     I am 75% looking forward to / 25% dreading my first Major
>     Earthquake Experience. From all the first-hand accounts I've read
>     and heard (hundreds, maybe thousands), they can be terribly
>     exciting. I just hope I'm not crossing Valencia when the next Big
>     One hits: in 1906 a big rift opened up in the middle of that
>     street......
>
>
>
>     +0ny
>
>
>
>
> _______________________________________________
> Noisebridge-discuss mailing list
> Noisebridge-discuss at lists.noisebridge.net
> https://www.noisebridge.net/mailman/listinfo/noisebridge-discuss
>
>
> No virus found in this message.
> Checked by AVG - www.avg.com <http://www.avg.com>
> Version: 2012.0.1834 / Virus Database: 2109/4723 - Release Date: 01/04/12
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.noisebridge.net/pipermail/noisebridge-discuss/attachments/20120106/2a1fa569/attachment-0003.html>


More information about the Noisebridge-discuss mailing list