Science > Physics > Specific Question On Measurement In Gravitational Field During Earthquake.
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Science > Physics |
| User: |
"neo" |
| Date: |
16 Nov 2006 04:18:28 PM |
| Object: |
Specific Question On Measurement In Gravitational Field During Earthquake. |
I think displacement of mass during earthquake induce changes in
gravitational field which propagate at least with speed of light. If a
body placed on sensitive electronic weigh machine show change in weight
due to changes in acceleration due to gravity, then we can get warning
few seconds before seismic waves strike to earth.
Here is usual argument of people: changes in gravitational field during
EQ are too subtle to measure.
But my specific question is: has any scientist ever conducted an
experiment to measure changes in gravitational field by observing
change in weight of body in which a body was placed on sensitive
electronic weigh machine?
It may prop up in your mind that it will be very small to measure. But
my question is: has ever such experiment been conducted?
I just want info on this specific question. I will be thankful to you
if you could guide me.
Thanks.
-neo.
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| User: "Phineas T Puddleduck" |
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| Title: Re: Specific Question On Measurement In Gravitational Field During Earthquake. |
16 Nov 2006 04:31:34 PM |
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In article <1163715508.381629.100780@m73g2000cwd.googlegroups.com>,
"neo" <MATREEX@gmail.com> wrote:
But my specific question is: has any scientist ever conducted an
experiment to measure changes in gravitational field by observing
change in weight of body in which a body was placed on sensitive
electronic weigh machine?
Think about the errors.
--
One..... Two.....Three....Four.....Five...............um...................
No wait, I know this
--
Posted via a free Usenet account from http://www.teranews.com
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| User: "Timberwoof" |
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| Title: Re: Specific Question On Measurement In Gravitational Field During Earthquake. |
17 Nov 2006 12:03:23 AM |
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In article <1163715508.381629.100780@m73g2000cwd.googlegroups.com>,
"neo" <MATREEX@gmail.com> wrote:
I think displacement of mass during earthquake induce changes in
gravitational field which propagate at least with speed of light. If a
body placed on sensitive electronic weigh machine show change in weight
due to changes in acceleration due to gravity, then we can get warning
few seconds before seismic waves strike to earth.
Here is usual argument of people: changes in gravitational field during
EQ are too subtle to measure.
It's a very good argument.
You could calculate the expected change in the force. Newton's Law of
Gravity makes it easy. Take any earthquake you want. Get the length of
the rupture and the displacement; make a guess of how deep it goes and
how far out to one side the crust was displaced. This gets you a volume,
a mass, and a distance displaced. That is easily to calculate to a
change in gravitational force.
So. How far away do you want your detector to be from the Earthquake? If
you want a few seconds' of notice, you need tens of thousands of feet.
distance. So how do you detect a three-foot movement of a weight five or
fifty miles away?
But my specific question is: has any scientist ever conducted an
experiment to measure changes in gravitational field by observing
change in weight of body in which a body was placed on sensitive
electronic weigh machine?
It may prop up in your mind that it will be very small to measure. But
my question is: has ever such experiment been conducted?
I just want info on this specific question. I will be thankful to you
if you could guide me.
--
Timberwoof <me at timberwoof dot com> http://www.timberwoof.com
It's easy to say a war is so important your neighbor should go fight it for you.
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| User: "tadchem" |
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| Title: Re: Specific Question On Measurement In Gravitational Field During Earthquake. |
17 Nov 2006 04:33:05 AM |
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neo wrote:
I think displacement of mass during earthquake induce changes in
gravitational field which propagate at least with speed of light. If a
body placed on sensitive electronic weigh machine show change in weight
due to changes in acceleration due to gravity, then we can get warning
few seconds before seismic waves strike to earth.
Here is usual argument of people: changes in gravitational field during
EQ are too subtle to measure.
But my specific question is: has any scientist ever conducted an
experiment to measure changes in gravitational field by observing
change in weight of body in which a body was placed on sensitive
electronic weigh machine?
In 1913 Michelson measured the change in gravitational field due to
displacing the mass of the moon by about half a million miles. OK - he
measured the change in the gravitational field as the moon went from
horizon to horizon. In a 500 foot tube the deflection of the water
(and hence the 'vertical' as defined by gravity was 0.001 inch. That
is an angular deflection of 0.0000096 degrees.
One may use this to calculate the change resulting from the
displacement of a few gigatonnes of mass a few meters.
Tom Davidson
Richmond, VA
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| User: "Timberwoof" |
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| Title: Re: Specific Question On Measurement In Gravitational Field During Earthquake. |
17 Nov 2006 09:34:08 PM |
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In article <1163759585.705730.101760@m73g2000cwd.googlegroups.com>,
"tadchem" <tadchem@comcast.net> wrote:
neo wrote:
I think displacement of mass during earthquake induce changes in
gravitational field which propagate at least with speed of light. If a
body placed on sensitive electronic weigh machine show change in weight
due to changes in acceleration due to gravity, then we can get warning
few seconds before seismic waves strike to earth.
Here is usual argument of people: changes in gravitational field during
EQ are too subtle to measure.
But my specific question is: has any scientist ever conducted an
experiment to measure changes in gravitational field by observing
change in weight of body in which a body was placed on sensitive
electronic weigh machine?
In 1913 Michelson measured the change in gravitational field due to
displacing the mass of the moon by about half a million miles. OK - he
measured the change in the gravitational field as the moon went from
horizon to horizon. In a 500 foot tube the deflection of the water
(and hence the 'vertical' as defined by gravity was 0.001 inch. That
is an angular deflection of 0.0000096 degrees.
One may use this to calculate the change resulting from the
displacement of a few gigatonnes of mass a few meters.
The problem is that while that much mass may move that far in an
earthquake, it's not as though it got moved through empty space. The
overall distribution of mass is still pretty much the same as it was
before you started.
Try this: Imagine a section of the Earth's crust before and after an
earthquake. Plot the center of its mass for those two times. The most
you have is a subtle change in density around the site of the rupture.
--
Timberwoof <me at timberwoof dot com> http://www.timberwoof.com
It's easy to say a war is so important your neighbor should go fight it for you.
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| User: "neo" |
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| Title: Re: Specific Question On Measurement In Gravitational Field During Earthquake. |
16 Nov 2006 06:51:18 PM |
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neo wrote:
I think displacement of mass during earthquake induce changes in
gravitational field which propagate at least with speed of light. If a
body placed on sensitive electronic weigh machine show change in weight
due to changes in acceleration due to gravity, then we can get warning
few seconds before seismic waves strike to earth.
Here is usual argument of people: changes in gravitational field during
EQ are too subtle to measure.
But my specific question is: has any scientist ever conducted an
experiment to measure changes in gravitational field by observing
change in weight of body in which a body was placed on sensitive
electronic weigh machine?
http://www.nytimes.com/2006/08/08/science/08find.html?ex=1312689600&en=86a5d19c1980f4e7&ei=5088&partner=rssnyt&emc=rss
150 pound man will experience loss in weight by 25000th of 1 ounce. 1
ounce = 28.349 gram.
Easily measuramable on electronic weigh machine.
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| User: "Phineas T Puddleduck" |
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| Title: Re: Specific Question On Measurement In Gravitational Field During Earthquake. |
16 Nov 2006 07:02:28 PM |
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In article <1163724678.313046.237910@e3g2000cwe.googlegroups.com>,
"neo" <MATREEX@gmail.com> wrote:
http://www.nytimes.com/2006/08/08/science/08find.html?ex=1312689600&en=86a5d19
c1980f4e7&ei=5088&partner=rssnyt&emc=rss
150 pound man will experience loss in weight by 25000th of 1 ounce. 1
ounce = 28.349 gram.
Easily measuramable on electronic weigh machine.
How do you isolate it and identify it, in lieu of errors?
--
One..... Two.....Three....Four.....Five...............um...................
No wait, I know this
--
Posted via a free Usenet account from http://www.teranews.com
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| User: "" |
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| Title: Re: Specific Question On Measurement In Gravitational Field During Earthquake. |
16 Nov 2006 07:55:03 PM |
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In sci.physics neo <MATREEX@gmail.com> wrote:
neo wrote:
I think displacement of mass during earthquake induce changes in
gravitational field which propagate at least with speed of light. If a
body placed on sensitive electronic weigh machine show change in weight
due to changes in acceleration due to gravity, then we can get warning
few seconds before seismic waves strike to earth.
Here is usual argument of people: changes in gravitational field during
EQ are too subtle to measure.
But my specific question is: has any scientist ever conducted an
experiment to measure changes in gravitational field by observing
change in weight of body in which a body was placed on sensitive
electronic weigh machine?
http://www.nytimes.com/2006/08/08/science/08find.html?ex=1312689600&en=86a5d19c1980f4e7&ei=5088&partner=rssnyt&emc=rss
150 pound man will experience loss in weight by 25000th of 1 ounce. 1
ounce = 28.349 gram.
Easily measuramable on electronic weigh machine.
Bzzzt, wrong answer.
This implies a resolution and accuracy of .0000016%.
That is about an order of magnitude better than you can get with a
really good analytical lab balance good to a couple of hundred grams max.
Electronic scales are about 3 orders of magnitude worse.
You will never find a scale that can measure 2.5X10^6 pounds out of
150 pounds.
--
Jim Pennino
Remove .spam.sux to reply.
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| User: "neo" |
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| Title: Re: Specific Question On Measurement In Gravitational Field During Earthquake. |
16 Nov 2006 06:52:26 PM |
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neo wrote:
I think displacement of mass during earthquake induce changes in
gravitational field which propagate at least with speed of light. If a
body placed on sensitive electronic weigh machine show change in weight
due to changes in acceleration due to gravity, then we can get warning
few seconds before seismic waves strike to earth.
Here is usual argument of people: changes in gravitational field during
EQ are too subtle to measure.
But my specific question is: has any scientist ever conducted an
experiment to measure changes in gravitational field by observing
change in weight of body in which a body was placed on sensitive
electronic weigh machine?
http://www.nytimes.com/2006/08/08/science/08find.html?ex=1312689600&en=86a5d19c1980f4e7&ei=5088&partner=rssnyt&emc=rss
150 pound man will experience loss in weight by 25000th of 1 ounce. 1
ounce = 28.349 gram.
Easily measuramable on electronic weigh machine.
.
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| User: "Timberwoof" |
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| Title: Re: Specific Question On Measurement In Gravitational Field During Earthquake. |
17 Nov 2006 12:04:58 AM |
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In article <1163724746.625618.70650@b28g2000cwb.googlegroups.com>,
"neo" <MATREEX@gmail.com> wrote:
neo wrote:
I think displacement of mass during earthquake induce changes in
gravitational field which propagate at least with speed of light. If a
body placed on sensitive electronic weigh machine show change in weight
due to changes in acceleration due to gravity, then we can get warning
few seconds before seismic waves strike to earth.
Here is usual argument of people: changes in gravitational field during
EQ are too subtle to measure.
But my specific question is: has any scientist ever conducted an
experiment to measure changes in gravitational field by observing
change in weight of body in which a body was placed on sensitive
electronic weigh machine?
http://www.nytimes.com/2006/08/08/science/08find.html?ex=1312689600&en=86a5d19
c1980f4e7&ei=5088&partner=rssnyt&emc=rss
150 pound man will experience loss in weight by 25000th of 1 ounce. 1
ounce = 28.349 gram.
Easily measuramable on electronic weigh machine.
If I were to stand on the microbalance we had in freshman chemistry, I'd
fail the class and owe the university thousands of dollars. IOW, not so
easily measurable.
How much does a breath weigh?
--
Timberwoof <me at timberwoof dot com> http://www.timberwoof.com
It's easy to say a war is so important your neighbor should go fight it for you.
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| User: "=?utf-8?B?SmEg4pml?=" |
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| Title: Re: Specific Question On Measurement In Gravitational Field During Earthquake. |
17 Nov 2006 01:48:01 AM |
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14 mcg from a 150 man at an altitude of 1400 ft ASL.
Timberwoof wrote:
In article <1163724746.625618.70650@b28g2000cwb.googlegroups.com>,
"neo" <MATREEX@gmail.com> wrote:
neo wrote:
I think displacement of mass during earthquake induce changes in
gravitational field which propagate at least with speed of light. If a
body placed on sensitive electronic weigh machine show change in weight
due to changes in acceleration due to gravity, then we can get warning
few seconds before seismic waves strike to earth.
Here is usual argument of people: changes in gravitational field during
EQ are too subtle to measure.
But my specific question is: has any scientist ever conducted an
experiment to measure changes in gravitational field by observing
change in weight of body in which a body was placed on sensitive
electronic weigh machine?
http://www.nytimes.com/2006/08/08/science/08find.html?ex=1312689600&en=86a5d19
c1980f4e7&ei=5088&partner=rssnyt&emc=rss
150 pound man will experience loss in weight by 25000th of 1 ounce. 1
ounce = 28.349 gram.
Easily measuramable on electronic weigh machine.
If I were to stand on the microbalance we had in freshman chemistry, I'd
fail the class and owe the university thousands of dollars. IOW, not so
easily measurable.
How much does a breath weigh?
--
Timberwoof <me at timberwoof dot com> http://www.timberwoof.com
It's easy to say a war is so important your neighbor should go fight it for you.
.
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