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It was determined that the burst originated from the soft gamma ray repeater star, SGR 1806-20, a neutron star 20 kilometers in diameter which rotates once every 7.5 seconds, matching the GRB pulsation period. SGR 1806-20 is located about 10 degrees northeast of the Galactic center and about 20,000 to 32,000 light years from us, or about as far away as the Galactic center. (Originally, it had been thought to be 45,000 light years from us. but new results place it closer.) The outburst released more energy in a tenth of a second than the Sun emits in 100,000 years. Other gamma ray bursts have been detected whose explosions were intrinsically more powerful than this one at the source of the explosion, but since those explosions originated in other galaxies tens of thousands of times more distant, the bursts were not nearly as bright when they reached our solar system. What makes the December 27th gamma ray burst unique is that it is the first time that a burst this bright has been observed, one that also happens to originate from within our own Galaxy.
Astronomers have theorized that gamma ray bursts might travel in association with gravity wave bursts. In the course of their flight through space, gamma rays would be deflected by gravitational fields and would be scattered by dust and cosmic ray particles they encountered, so they would be expected to travel slightly slower than their associated gravity wave burst which would pass through space unimpeded. After a 45,000 year light-speed journey, a gamma ray burst arrival delay of 44.6 hours would not be unexpected. It amounts to a delay of just one part in 9 million. So if the gravity wave traveled at the speed of light (c), the gamma ray burst would have averaged a speed of 0.99999989 c, just 0.11 millionths slower. There is also the possibility that at the beginning of its journey the gravity wave may have had a superluminal speed.
If anything, the December 27, 2004 gamma ray burst shows us that we do not live in a peaceful celestial environment. And if the December 26th earthquake was in fact part of this same celestial event, we see that this stellar eruption has claimed many lives. For this reason, it is important that we prepare for the possibility of even stronger events in the future, the arrival of superwaves issuing from the core of our Galaxy. Like the December 26th earthquake and the December 27th gamma ray burst, the next superwave will arrive unexpectedly. It will take us by surprise.
Originally posted by punkinworks
no the 2004 earthquake was not caused by a GRB.
Period
It was one large earthquake in an era with a very long history of very large earthquakes.
Along a known subduction fault zone.
Originally posted by punkinworks
and how could a gama ray burst cause an earthquake, and besides the grb was observed the next day?
Originally posted by Phage
According to the theory which predicts the existence of gravity waves, their amplitude follows the inverse square law, meaning that by the time they would reach us they would be very, very weak. We have been trying unsuccessfully, with highly sensitive instruments, to detect gravity waves for a while now.
Doesn't it seem odd to you that gravity waves intense enough to create an earthquake would be undetectable with these instruments?
[Please note, the gravity potential gradient associated with a stellar explosion or core explosion would drop off in intensity inversely with distance traveled (according to 1/r), and would not drop off as the inverse cube of distance as some have claimed on the internet. That is, it does not have a force-distance dependence similar to the lunar tidal force. So the impact would be quite significant. The mathematics are worked out in the above reference.]
Many have inquired if there might be a connection between these two events (e.g., see the Space.com article). Not thinking of the gravity wave connection, astronomers have been reluctant to admit there might be a connection since they know of no mechanism by which gamma rays by themselves could trigger earthquakes. They admit that the December 27th gamma ray burst had slightly affected the ionization state of the Earth's atmosphere, but this by itself should not have caused earthquakes. However, if a longitudinal gravity potential wave pulse were to accompany a gamma ray burst, the mystery becomes resolved. The connection between earthquakes and gamma ray bursts now becomes plausible.
Originally posted by punkinworks
reply to post by Karilla
and why just one fault and not many others
like phage said
and theres the simple fact that no one has ever detected a gravitational wave ever, if it was big enough to dislodge a huge chunk of crust sure it would have manifested itself i other ways.
Originally posted by Phage
T.T. Brown has not been spent the last 50 years logging gravity waves. He died 24 years ago and he made claims about a lot of things that were never independently verified or duplicated.
[edit on 9/18/2009 by Phage]
Although gravitational radiation has not yet been directly detected, it has been indirectly shown to exist. This was the basis for the 1993 Nobel Prize in Physics, awarded for measurements of the Hulse-Taylor binary system. Various gravitational wave detectors exist.
Though the Hulse-Taylor observations were very important, they give only indirect evidence for gravitational waves. A more conclusive observation would be a direct measurement of the effect of a passing gravitational wave, which could also provide more information about the system which generated it. Any such direct detection is complicated by the extraordinarily small effect the waves would produce on a detector. The amplitude of a spherical wave will fall off as the inverse of the distance from the source (the 1 / r term in the formulas for h above). Thus, even waves from extreme systems like merging binary black holes die out to very small amplitude by the time they reach the Earth. Astrophysicists expect that some gravitational waves passing the Earth may be as large as h\approx 10^[-20], but generally no bigger.