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Tom Bedlam :
However, just for fun, I found some research being done on drilling into box girders and flooding them with thermobarics a split second before you detonate them - guess what - it shatters steel box girders like glass. What a weird thing to research.
It should be obvious to the reader that it's implausible an ANFO bomb parked out in the street would have the force to blow all the way through a huge superstructure like the Alfred P. Murrah Building.
No matter how hard the government tried to lie, obsfucate, and distort the truth, the evidence would come back to haunt them.
On April 19, a tape recording made during a conference at the Water Resources Board directly across from the Murrah Building appears to indicate a succession of blast events, spaced very close together. 
The tape recorder at the Water Resources Board was not the only instrument recording explosions that morning. The seismograph at the Oklahoma Geological Survey at the University of Oklahoma at Norman, 16 miles from the Murrah Building, recorded two waves, or "two events," on the morning of April 19th. Another seismograph at the Omniplex Museum, four miles away from the Federal Building, also recorded two events. These seismic waves, or "spikes," spaced approximately ten seconds apart, seem to indicate two blasts. [See Appendix]
Professor Raymond Brown, senior geophysicist at the University of Oklahoma who studied the seismograms, knew and talked to people inside the building at the time of the blast. "My first impression was, this was a demolition job," said Brown. "Somebody who went in there with equipment tried to take that building down."
Not so, according to the U.S. Geological Survey's analysis. The USGS put out a press release on June 1st, entitled "Seismic Records Support One-Blast Theory in Oklahoma City Bombing."
The bomb that destroyed the Alfred P. Murrah Building in Oklahoma City produced a train of conventional seismic waves, according to interpretations by scientists with the U.S. Geological Survey and the Oklahoma Geological Survey (OGS).
Scientists from those agencies said the seismic recordings of the May 23 demolition of the building reproduced the character of the original, April 19th seismic recording by producing two trains of seismic waves that were recorded on seismometers near Norman, Okla.
"Seismic recordings from the building's implosion indicate that there was only one bomb explosion on April 19," said Dr. Thomas Holzer, a USGS geologist in Menlo Park, Calif. Holzer is one of several USGS and OGS scientists who analyzed the shock waves created by the April 19 explosion and the May 23 implosion.
Holzer added that the two distinct waves from the April 19 explosion(s) were the result of the same wave traveling at two different speeds through two separate layers of the earth's crust. The "illusion" of a double explosion was simply the result of the building's collapse, he claimed. "So the bottom line then," said Holzer, "is I think these observations are totally consistent with a single explosion. It doesn't require multiple explosions to do it."
Dr. Brown has an honest difference of opinion with folks at the U.S. Geological Survey. "I will candidly say that we are having trouble finding that velocity difference," said Brown. "We have not identified a pair of layers that could account for the ten-second difference.
"Whatever the USGS saw in that data convinced them that the original blast was one bomb," he added. "I find that hard to believe…. What was uncomfortable and might be construed as pressure is that they were going to come out with a press release that says we have concluded that data indicates one bomb. It puts us in the uncomfortable stance of saying that we, too, have concluded that, and we haven't."
Yet the USGS press release said that Dr. Charles Mankin of the OGS, Brown's boss, was "pleased with the work performed by Dr. Holzer and his USGS colleagues in the analysis of the seismic records." Yet Mankin had actually urged Holzer to delay the press release. "Everybody that has looked at the signal has said a refraction (an echo) would really be strange because there's absolutely no loss of energy in the recorded seismic signal. The second event has the same amplitude as the first… The arrival time is wrong for a refracted wave… We've ruled out reflections, refractions, and the air blast… We determined that these two records of these two events corroborate our interpretation that there were two explosions."
The mainstream media, of course, jumped on the USGS's findings, with headlines like "Single Bomb Destroyed Building" and "Seismic Records Shake Murrah Multiple Bomb Theory." "The news media even reported two bomb blasts initially," said Mankin, "but later changed their story."
"The USGS's conclusions are not supported by either data or analysis," added Brown, who asked that his name be taken off the report. Although Brown cautions that his own conclusions are far from conclusive and require "more thorough investigation," the most logical explanation for the second event says Brown, is "a bomb on the inside of the building."
"Even the smallest of those detonations (from the May 23rd demolition of the REMAINS of the Murrah building) had a larger effect on the recording than the collapse of the building," he added, "which demonstrates that the explosives are much more efficient at exciting the ground motion than is the collapse of three-fourths of the building. So it is very unlikely that one-fourth of the building falling on April 19th could have created an energy wave similar to that caused by the large [truck-bomb] explosion."
One of the problems with the two event theory is that the spikes on the seismic readings were ten seconds apart. With that much difference, most everybody in the vicinity should have heard two separate blasts. But given the traumatic nature of being in the immediate vicinity of a bombing, would witnesses necessarily have heard two explosions? Although the sound of a truck-bomb would certainly have made a loud, roaring noise, complete with lots of smoke and flying debris, experts say that the "crack" of a C-4 cutting charge is "downright disappointing" to hear.