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From: Don Klipstein on 4 May 2010 00:53
In <671d96b8-9355-48b0-afdb-1174e7683791(a)a27g2000prj.googlegroups.com>,
Bret Cahill wrote:
>> >> >>> String a wire back and forth across / along a fault line to measure
>> >> >>> very small displacements in the earth's surface. �If the resistance
>> >> >>> and/or tensile strength needs to be higher than a common single alloy
>> >> >>> wire then structural steel cable could be wrapped around a insulated
>> >> >>> wire with a higher resistivity. �It could be temperature compensated
>> >> >>> as usual, with another wire of the same length loosely supported
>> >> >>> nearby in another leg of the bridge.
>> >> >>> An abandoned power line may be good to go if it is properly located.
>> >> >>> Good info sometimes comes in small displacements.
>> >> >>> Bret Cahill
>> >> >> Two gps stations on both sides do the same trick
>>
>> >> > What's the smallest displacement -- not movement but actual change in
>> >> > _distance_ between two points -- they can measure?
>>
>> >> > Bret Cahill
>>
>> >> They measure continental drift with them in cm's per year....
>>
>> >The warning might be in microns.
>>
>> >Bret Cahill
>>
>> What warning? Faults creep all the time.
>
>At constant speed?
>
>If that were true all the acceleration measurements published by USGS
>or Cal Tech on the web in real time would always be zero.
>
>There may be some characteristic behaviour of certain faults that
>could be highly reliable early warning info.
>
>> Knowing the rate of creep has zero useful predictive value.
>
>Has this been proven over long distances measuring displacements of a
>few thousandths of an inch?

I would like to add a couple things:

1: How do you propose to discern signal of "a few thousandths of an inch"
from noise including whatever harmless-and-usual deviations of-noise-type
from cm-per-year scale plate movement?

I would worry more about somewhere having fault movement of a few
millimeters within a day transferring stress to "where a big one will
come from". If that does not cause a major earthquake within a day, then
the "big quake" has fair chance of coming 20-30-plus years later.

I would also worry about "a big one" having mere few minutes of advance
warning from significant acceleration of detection of "fault slips", along
with likely a majority of these being "minor burps" as opposed to "the
brown stuff hitting the fan".

Not that I want to discourage research in this area...

--
- Don Klipstein (don(a)misty.com)
From: jimp on 4 May 2010 01:28
In sci.physics Bret Cahill <BretCahill(a)peoplepc.com> wrote:
>> String a wire back and forth across / along a fault line to measure
>> very small displacements in the earth's surface.  If the resistance
>> and/or tensile strength needs to be higher than a common single alloy
>> wire then structural steel cable could be wrapped around a insulated
>> wire with a higher resistivity.  It could be temperature compensated
>> as usual, with another wire of the same length loosely supported
>> nearby in another leg of the bridge.
>>
>> An abandoned power line may be good to go if it is properly located.
>>
>> Good info sometimes comes in small displacements.
>>
>> Bret Cahill
>
>
> The problem is just to the East of Laguna Salada:
>
> http://maps.google.com/maps?f=q&hl=en&q=32.2006,-115.4625(M3.0+-+Baja+California,+Mexico+-+2010+May+04+02:35:27+UTC)&t=h&z=9&iwloc=A
>
> String a thin steel wire from Aqua Matias to Cucapa returning with a
> larger diameter copper wire with a resistance << than the steel.
>
> All those << M 1.0 movements can now be documented and studied.
>
>
> Bret Cahill

Obviously you have no clue what "Wheatstone Bridge" means and are just,
once again, throwing out technical terms you think will impress people
with your knowledge.


--
Jim Pennino

Remove .spam.sux to reply.
From: jimp on 4 May 2010 01:31
In sci.physics Bret Cahill <BretCahill(a)peoplepc.com> wrote:
>> >String a wire back and forth across / along a fault line to measure
>> >very small displacements in the earth's surface.  If the resistance
>> >and/or tensile strength needs to be higher than a common single alloy
>> >wire then structural steel cable could be wrapped around a insulated
>> >wire with a higher resistivity.  It could be temperature compensated
>> >as usual, with another wire of the same length loosely supported
>> >nearby in another leg of the bridge.
>>
>> >An abandoned power line may be good to go if it is properly located.
>>
>> >Good info sometimes comes in small displacements.
>>
>> >Bret Cahill
>>
>> Differential GPS and laser rangefinders make a lot more sense.
>
> Laser rangefinders can work over dozens to hundreds of miles in a dust
> storm or rainstorm?

Hundreds of miles, nope, but when combined with GPS you don't need lasers
to go hundreds of miles.

> To the nearest few microns?

Over hundreds of miles microns are meaningless and in the noise of numerous
factors.


--
Jim Pennino

Remove .spam.sux to reply.
From: Cwatters on 4 May 2010 08:05

"Bret Cahill" <BretCahill(a)peoplepc.com> wrote in message
news:1e80670c-07b7-4c3b-8578-
>The warning might be in microns.
>Bret Cahill

Which you plan to measure with string? What advantage does string offer over
existing GPS and laser based devices?





From: Cwatters on 4 May 2010 08:08

"Bret Cahill" <BretCahill(a)peoplepc.com> wrote in message
news:120c41b8-59e1-438b-91f0-829eeabeb471(a)a2g2000prd.googlegroups.com...
>> >String a wire back and forth across / along a fault line to measure
>> >very small displacements in the earth's surface. If the resistance
>> >and/or tensile strength needs to be higher than a common single alloy
>> >wire then structural steel cable could be wrapped around a insulated
>> >wire with a higher resistivity. It could be temperature compensated
>> >as usual, with another wire of the same length loosely supported
>> >nearby in another leg of the bridge.
>>
>> >An abandoned power line may be good to go if it is properly located.
>>
>> >Good info sometimes comes in small displacements.
>>
>> >Bret Cahill
>>
>> Differential GPS and laser rangefinders make a lot more sense.
>
>Laser rangefinders can work over dozens to hundreds of miles in a dust
>storm or rainstorm?
>
>To the nearest few microns?
>
>Bret Cahill

How does string work over hundreds of miles ins a dust storm?




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