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From: Bret Cahill on 9 May 2010 19:39
> >> >> Take a wooden pencil and very slowly bend it. You will begin to hear
> >> >> small cracking noises
>
> >> >I can predict that pretty good with strain sensors.
>
> >> No, you can't. You won't get a 10 millisecond warning as to when the
> >> pencil will break.
>
> >Depends on how fast you load the pencil.  If you load it over several
> >months or years I'll get at least some warning that it is being
> >loaded.
>
> >The linearity / non linearity allows for even better predictions.
>
> >> Now imagine only being able to place a few surface
> >> sensors on one face
>
> >It's not really on one face.  It's several miles above from what may
> >be a thousands of faces.
>
> >No one said it was a easy problem, just that there might be some
> >additional information to exploit.
>
> >Distance metrology needs to get the error down to a few microns over
> >100 km.  Apparently laser interferometry is just for short distances,
> >even turbulence will mess up the measurement.
>
> >The strain sensor might not work for the simple reason the strains
> >would be so low.
>
> >What is the best resolution possible with a bridge?
>
> >Another solution might be the World's Largest Seismometer, a proof
> >mass of hundreds of tons.
>
> >> of literally millions of cubic miles of complex,
> >> fractured, stressed, moving subsurface stuff.
>
> >There might be some hope in averages here.
>
> Absolutely. You can probably estimate the average time between
> earthquakes. Numbers like 300 +-250 years.

You'll be trying a little harder after a few hours trapped under some
rubble.

Here's an effort to circumvent massive machined commercial
seismometers with smarter electronics:

http://physics.mercer.edu/petepag/eigen.html

Some waves travel much faster than the 2 mps Raleigh waves that do all
the damage. 30 seconds isn't enough time to fix a lunch but it's
better than nothing.


Bret Cahill




From: jimp on 9 May 2010 20:01
In sci.physics Bret Cahill <BretCahill(a)aol.com> wrote:

> Here's an effort to circumvent massive machined commercial
> seismometers with smarter electronics:
>
> http://physics.mercer.edu/petepag/eigen.html

No, it is not, and seismometers have been mechanically trivial to build for
many decades.


--
Jim Pennino

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