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Natural Science Forum / Earth Science / Earthquakes / July 2008Earth's Magnetic field
The earth's magnetic field has weakened and reversed many times in the past. Approximately every 250.000 years on average. This is how Sea Floor Spreading was discovered because of the locked-in orientation of the earth's magnetic field in solidifying magma near the Spreading Center of the oceanic plates. What is so different about this new research that has everyone knickers in a knot.? Scientists have been saying for quite a while now that a reversal is coming soon( In geologic time that is). It has been about 780,000 years since the last reversal, so we are a bit overdue. BTW the magnetic field has never completely disappeared during these previous reversals. What this has to do with either the North or South Geographic Pole pointing towards the sun instead of the way it is now is beyond me. Harold A. Climer Dept Of Physics Geology & Astronomy U.T. Chattanooga Room 406A Engineering,Math & Computer Sicence Building 615 McCallie Ave. Chattanooga TN 37403 Harold-Climer@utc.edu > The earth's magnetic field has weakened and reversed many times in the > past. Approximately every 250.000 years on average. This is how Sea [quoted text clipped - 8 lines] > magnetic field has never completely disappeared during these previous > reversals. There have recently been a program on Nova and an article in Scientific American covering this topic. It seems that the magnetic field doesn't disappear; rather it develops more and more "anomalies" until the field resembles swiss cheese with lots of local N and S poles. Eventually the multiple poles coalesce, leaving just the one S and N ... but reversed from the previous configuration. There was a guy who wrote a computer simulation of this process and left it running for months ... after a vacation he returned to find that his magnetic field had switched directions. He looked back at the data and found the details of the process. Someone else has been looking through British Admiralty charts of magnetic anomalies. He says they're getting worse ... and, of course, the magnetic poles are moving quickly. > What this has to do with either the North or South Geographic Pole > pointing towards the sun instead of the way it is now is beyond me. And the rest of us! > Harold A. Climer > Dept Of Physics Geology & Astronomy [quoted text clipped - 3 lines] > Chattanooga TN 37403 > Harold-Climer@utc.edu  SignatureTimberwoof <me at timberwoof dot com> http://www.timberwoof.com "When you post sewage, don't blame others for emptying chamber pots in your direction." ‹Chris L. On Jul 11, 2:18 am, Timberwoof <timberwoof.s...@inferNOnoSPAMsoft.com> wrote: > In article <3bqc74luu7jda9bflp3idgrskp8o3j9...@4ax.com>, > [quoted text clipped - 31 lines] > > And the rest of us! The earth appears to be a fluid. This may be a conception of the ballistic forced on earth science in lieu of the true explanation or at least a better one. I can't see any mechanism that would cause plates to fly one over the other, more; provide energy input to the mechanism that has to be disposed of as earthquakes. It would appear that the moon in captured rotation, though it spins twenty seven times further than the earth, only one twenty-seventh as often, has no appreciable magnetism. And this is due to the material composition? Worse, we know that all material loses its magnetism at cherry red heat, that is at about 500 degrees Centigrade. And that the proof of the changes in this so called magnetic shift is supplied by the action of volcanic effluvia. Is it really so? In article <943fd4d2-949c-4798-80d8-c68b88944290@r66g2000hsg.googlegroups.com>, > On Jul 11, 2:18 am, Timberwoof <timberwoof.s...@inferNOnoSPAMsoft.com> > wrote: [quoted text clipped - 35 lines] > > The earth appears to be a fluid. Well, no, not if you interpret seismic waves the way they behave in the laboratory. Pressure waves travel through solids and liquid; shear waves travel through solids and not liquids. There is a fairly well defined region inside the earth which does not pass shear waves. It is believed, with good reason, to be liquid while the rest is solid. > This may be a conception of the > ballistic forced on earth science in lieu of the true explanation or > at least a better one. Like what? > I can't see any mechanism that would cause > plates to fly one over the other, Hm. Well, I read the geology textbooks and the online descriptions of mantle convection and it seems good enough for me. (I assume you mean "fly" in a figurative sense. And they don't really do it "over one another," but I'll grant you some poetic license because you're trying to make a point by setting up strawmen.) > more; provide energy input to the > mechanism that has to be disposed of as earthquakes. Didn't you read the chapters on current planetary formation theory? And didn't you read the part about how radioactive potassium heats the core? > It would appear that the moon in captured rotation, though it spins > twenty seven times further than the earth, than what? > only one twenty-seventh as > often, has no appreciable magnetism. Well, yes, it would *appear* so to anyone carrying a magnetometer, as the Apollo astronauts did. How long do you think a month is? > And this is due to the material composition? Yes, if you include in that its state. The moon is not dense enough to have much of a core, and it's small enough that whatever there was cooled and solidified a long time ago. > Worse, we know that all material loses its magnetism at cherry red > heat, that is at about 500 degrees Centigrade. Well, if you melt a magnet, that would happen. If you understood how magnetism comes about, you'd know why. Then comes the interesting fact that if you spin molten iron, it will generate electrical flow and a magnetic field. Which ties in nicely to what's going on on Earth. > And that the proof of > the changes in this so called magnetic shift is supplied by the action > of volcanic effluvia. You seem to be talking about the changes in magnetism recorded in the seafloor around spreading centers. > Is it really so? Yeah. Why not? It seems to me that someone who keeps himself ignorant of scientific knowledge, or who reads a little bit here and there and jumps to simple delusions, might not understand how such things work and might even want to deny that they are so. But it really doesn't take all that much basic understanding of physics and chemistry to get a handle on what's going on. A basic high school education supplemented by some college and a healthy dose of good popular science books and magazines should be enough. But I'm sure no one here fits the ignorant description I just gave, right? SignatureTimberwoof <me at timberwoof dot com> http://www.timberwoof.com "When you post sewage, don't blame others for emptying chamber pots in your direction." ‹Chris L. On Jul 12, 2:26 am, Timberwoof <timberwoof.s...@inferNOnoSPAMsoft.com> wrote: > How long do you think a month is? 30 degrees. You? In article <8c1c9636-1d29-4850-a5f2-40d994e49d0b@k13g2000hse.googlegroups.com>, > On Jul 12, 2:26 am, Timberwoof <timberwoof.s...@inferNOnoSPAMsoft.com> > wrote: [quoted text clipped - 4 lines] > > You? Seems I stumped you so badly with that question that you didn't want to deal with any of the rest of what I wrote. SignatureTimberwoof <me at timberwoof dot com> http://www.timberwoof.com "When you post sewage, don't blame others for emptying chamber pots in your direction." ‹Chris L. On Jul 12, 8:48 am, Timberwoof <timberwoof.s...@inferNOnoSPAMsoft.com> wrote: > In article > <8c1c9636-1d29-4850-a5f2-40d994e49...@k13g2000hse.googlegroups.com>, [quoted text clipped - 10 lines] > Seems I stumped you so badly with that question that you didn't want to > deal with any of the rest of what I wrote. Hardly. I didn't wish to embarrass you. You provide enough of that for the amusement of all interested in that as it is. Do you happen to know how long a month is now that you have the answer? In article <931b326b-c420-4bd4-9539-6a003348e170@p25g2000hsf.googlegroups.com>, > On Jul 12, 8:48 am, Timberwoof <timberwoof.s...@inferNOnoSPAMsoft.com> > wrote: [quoted text clipped - 14 lines] > > Hardly. I didn't wish to embarrass you. Do your worst! > You provide enough of that for > the amusement of all interested in that as it is. Uh huh. Right. > Do you happen to know how long a month is now that you have the > answer? Sidereal, synodic, anomalistic, tropical, or draconic? I'm not sure which of those could be answered as "30 degrees". if 365.256 days = 360 degrees, then "30 degrees" could be taken to mean 30.4 days, which isn't any of those. One of them is somewhat close, if you meant days. SignatureTimberwoof <me at timberwoof dot com> http://www.timberwoof.com "When you post sewage, don't blame others for emptying chamber pots in your direction." ‹Chris L. On Jul 12, 7:35 pm, Timberwoof <timberwoof.s...@inferNOnoSPAMsoft.com> wrote: > In article > <931b326b-c420-4bd4-9539-6a003348e...@p25g2000hsf.googlegroups.com>, [quoted text clipped - 19 lines] > > Do your worst! Strangely and unintentionally, it seems that I did: > > Do you happen to know how long a month is now that you have the > > answer? [quoted text clipped - 6 lines] > 30.4 days, which isn't any of those. One of them is somewhat close, if > you meant days. On Jul 12, 2:26 am, Timberwoof <timberwoof.s...@inferNOnoSPAMsoft.com> wrote: > <943fd4d2-949c-4798-80d8-c68b88944...@r66g2000hsg.googlegroups.com>, > [quoted text clipped - 5 lines] > region inside the earth which does not pass shear waves. It is believed, > with good reason, to be liquid while the rest is solid. Well, yes, if you interpret them the way they behave in the planet. > > This may be a conception of the observed ballistics forced on earth science in > > lieu of a more likely explanation. > > Like what? Unfortunately the pseudo science of geology is so fraught with misconceptions about basic physics that the ideas of the "three body problem" are totally divorced from it. Where would you like me to start, assuming you have the ability of paying the slightest attention to anything I say? That WOULD be one small step for mankind. A gawping chasm awaits you. Now gird up your loins, channel all you abilities and blow you bayne cell to bits, you won't miss it. In article <cbc6bf16-5853-4e12-b5cc-4b07e5bf36d0@r35g2000prm.googlegroups.com>, > On Jul 12, 2:26 am, Timberwoof <timberwoof.s...@inferNOnoSPAMsoft.com> > wrote: [quoted text clipped - 9 lines] > > Well, yes, if you interpret them the way they behave in the planet. That's like saying a glass of water is a fluid. > > > This may be a conception of the observed ballistics forced on earth > > > science in [quoted text clipped - 5 lines] > misconceptions about basic physics that the ideas of the "three body > problem" are totally divorced from it. The three-body problem has to do with how three rigid bodies interact gravitationally; that doesn't have direct bearing on the Earth's geologic processes. > Where would you like me to start, assuming you have the ability of > paying the slightest attention to anything I say? I tend to fall asleep while clueless people are blaterhing. What were you saying? > That WOULD be one small step for mankind. > A gawping chasm awaits you. > > Now gird up your loins, channel all you abilities and blow you bayne > cell to bits, you won't miss it. Zzzzzzzzzzzz. SignatureTimberwoof <me at timberwoof dot com> http://www.timberwoof.com "When you post sewage, don't blame others for emptying chamber pots in your direction." ‹Chris L. > Scientists have been saying for quite a while now that a reversal is > coming soon( In geologic time that is). It has been about 780,000 > years since the last reversal, so we are a bit overdue. BTW the > magnetic field has never completely disappeared during these previous > reversals. More precisely, real scientists have discovered the magnetic field "flickers" like the flame of candle. So it is unclear the 8% decrease in intensity since Gauss first measured the field stength is a flicker or a trend. |
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