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'[PICLIST] Fw: [OT] gravity waves'
2001\06\01@182125 by Jinx

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----- Original Message -----
From: alice campbell
Sent: Saturday, June 02, 2001 4:24 AM
Subject: [OT] gravity waves


{Quote hidden}

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2001\06\01@194239 by James R. Cunningham

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How about 4 time-correlated sensitive detectors distanced by about 1/3 of
the earth's circumference between 3 and 1/2 for the 4th?
To the extent possible, delete all non-correlated signal and use phase
difference between correlated signals to determine direction of the
source.

Jim

Jinx wrote:

> > So detecting gravity waves will involve eliminating an awful
> >  lot of stuff and hoping what's left is what you are looking for.
> >
> > alice

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2001\06\01@211708 by Jinx

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> > Geophysicists routinely use microgravity meters
> >  to measure small changes in the earth's gravitational field.

And I think mining surveyors can detect ore deposits from the air
by some sort of trailing wire. Australia is interlaced with fault lines
that are used for both earthquake prediction and mineral location
by measuring the changes in magnetic fields as the plates move

On a smaller scale, I saw a documentary a couple of weeks ago
about a team looking for Blackbeard The Pirate's galleon around
the coast of South Carolina. They were able to locate cannons
buried under 20ft of silt using magnetic disturbance techniques.
I expect Ballard used something similar to find loose bits of the
Titanic

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2001\06\02@071213 by Peter L. Peres

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> And I think mining surveyors can detect ore deposits from the air
> by some sort of trailing wire. Australia is interlaced with fault lines
> that are used for both earthquake prediction and mineral location
> by measuring the changes in magnetic fields as the plates move

In all cases there is 'something' at the end of the trailing wire. The
something is usually a magnetometer but in rare occasions there is also a
gravimeter in the blob at the end of the cable.

Peter

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2001\06\02@072234 by Alan B. Pearce

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> And I think mining surveyors can detect ore deposits from the air
> by some sort of trailing wire. Australia is interlaced with fault lines
> that are used for both earthquake prediction and mineral location
> by measuring the changes in magnetic fields as the plates move

I believe some of this mineral finding is done using nuclear magnetic
resonance (I think that is the correct name) where a container of liquid is
pulsed with a magnetic field by pulsing a current through a coil. The decay
time of the precession of the molecules can then be measured by using the
same coil to pick up the magnetic field as it decays. This decay is a
function of the materials outside the liquid and other fields. I seem to
remember an article in an issue of the UK magazine Practical Electronics
some years ago. I think they used kerosene (paraffin) as the liquid.

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2001\06\02@104624 by Jim Paul

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Yes.
-----Original Message-----
From: Peter L. Peres <spam_OUTplpTakeThisOuTspamACTCOM.CO.IL>
To: .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU <PICLISTspamKILLspamMITVMA.MIT.EDU>
Date: Saturday, June 02, 2001 6:12 AM
Subject: Re: [OT] gravity waves


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