Re: Anti-armor mines!

Brad Holden <holden@tokyo-rose.uchicago.edu> wrote:
>>    Today's gravity meters mounted Los Angeles class submarines can
detect
>>opposing Soviet submarines. See a recent issue of Scientific American,
which
>>discusses declassified US Navy gravitometers and their accuracy.
>>Given 100-200 years of rapidly improving technology, and I can see no
reason
>>why mines couldn't be located from outside their burst radius.
>Uh, are you sure about that?  I read the article and I don't remember
>the gravitometer being that good....  I am just checking, I am not
>saying your wrong.

Scientific American June, 1998 issue. Page 58. Third column. Third
paragraph:
    "... Because the submarine gradiometer system was still a classified
military technology, much of the work designing the experimental
protocols
and assessing the raw data took place behind a door that was closed and
barred to the civilian geologists involved....
    "And over the next few months, as "sanitized" sets of data (ones
from
which the information presented would not reveal any military secrets)
began
to emerge from behind locked doors in Buffalo, the power of gravity
gradiometry became clear."

On page 61, left picture, the pixels depicting gravity gradient appear
to be
too smooth!

    The article introduction claims "...classified technique used to
navigate ballistic-missile submarines..."

A submarine weighs 1000's of tons. Like under water mountain ridges!

Therefore it is fairly clear to me that US subs could detect the
presence of
unknown submarines with the use of gravity gradiometers.

Andrew Martin
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-----Original Message-----
From: Brad Holden <holden@tokyo-rose.uchicago.edu>
To: Al.Bri@xtra.co.nz <Al.Bri@xtra.co.nz>
Date: Friday, 4 September 1998 1:02 PM
Subject: Re: Anti-armor mines!

>
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>   From: "Andrew Martin" <Al.Bri@xtra.co.nz>
>   Reply-To: FTGZG-L@bolton.ac.uk
>   Date: Fri, 4 Sep 1998 10:52:51 +1200
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>   Tony Christney <acc@questercorp.com> wrote:
>   >Unfortunately, it is highly unlikely that you could devise a
>   >gravity meter that could measure such minute variations in the
local
>   >field. Current field gravity meters may be able to detect a
>   >salt dome of several thousand metric tons after many corrections
>   >(usually free-air, Bouguer, topological and tidal). Mines - no way.
>   >
>   >If you were to measure such small variations, you would have to get
>   >very close to the mines (probably on the order of centimeters), at
>   >which point you would be in the middle of the mine field...
>
>	Today's gravity meters mounted Los Angeles class submarines can
detect
>   opposing Soviet submarines. See a recent issue of Scientific
American,
which
>   discusses declassified US Navy gravitometers and their accuracy.
>	Given 100-200 years of rapidly improving technology, and I see
no
reason
>   my why mines couldn't be located from outside their burst radius.
>
>Uh, are you sure about that?  I read the article and I don't remember
>the gravitometer being that good....  I am just checking, I am not
>saying your wrong.
>
>cheers
>brad
>