PSN-L Email List Message

Subject: Re: "Giant Seismometer"
From: Mike Lozano mikel@...............
Date: Wed, 27 Dec 2000 10:59:56 -0600

Kind of like 'mobile homes' attracting tornadoes!


D Collins wrote:

> At 05:28 AM 12/27/00 , you wrote:
> >John --
> >
> >I admire the creative process that thought this one up!!!
> >
> >I wonder, however, if there isn't a basic flaw in this
> >plan.  I would expect that any such fiber optic cables are
> >installed with generous numbers of expansion loops.  Thus,
> >there would be very little variation in strain in conjuction
> >with geological events.  However the following does not
> >mention the mechanism which produces said strain so I may
> >have missed the point here.
> Yes, as an old fiber design engineer for the phone company, our general
> rule of thumb was to go about three manholes and put in a slack loop. This
> insured that ample cable would be available for re-splicing in the event of
> a dig-up or some other problem.  Fiber optic cables are the strongest
> digger attractor in the world 8<)
> Darrell
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Larry Cochrane <cochrane@..............>