PART FOUR: Conclusion and Appendix
Bomb Damage Analysis Of Alfred P. Murrah Federal Building
Oklahoma City, Oklahoma
PART FOUR
Seismograph Readings

Much has been said about seismograph readings. Was there more than one explosion? Most people I talked to in Oklahoma City heard two explosions relatively close together. Some close by said they didn't even hear an explosion. That is not unreasonable, when you consider that getting walloped by an intense shock wave is about like being hit across the ear by a 2" x 4". One would expect the demolition charges to have had an electrical or primacord interconnect. If so, it would be difficult to separate them on a seismograph. If delays were used, they would be discrete. If a sensitivity switch was used inside the building, the explosions would have been distinct. Bomb initiations could have been easily designed to go off either simultaneously or with separation.

Conclusion

The Murrah Federal Building was not destroyed by one sole truck bomb. The major factor in its destruction appears to have been detonation of explosives carefully placed at four critical junctures on supporting columns within the building.

The only possible reinforced concrete structural failure solely attributable to the truck bomb was the stripping out of the ceilings of the first and second floors in the "pit" area behind columns B4 and By. Even this may have been caused by a demolition charge at column B3.

It is truly unfortunate that a separate and independent bomb damage assessment was not made during the cleanup__before the building was demolished on May 23 and hundreds of truck loads of debris were hauled away, smashed down, and covered with dirt behind a security fence.

When the picture at Tab 4 was made, all evidence of demolition charges had been removed from the building site (i.e., the stubs of columns B3, A3, A5, A7 and the demolished junctures at the header with columns A3, A5 and A7.

All ambiguity with respect to the use of supplementing demolition charges and the type of truck used could be quickly resolved in the FBI were required to release the surveillance camera coverage of this terribly tragic event.

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Appendix (Tab 9/no graphic)

Letter of support from Rodger A. Raubach Ph.D.

Rodger A. Raubach Ph.D.

P.O. Box 3042, Casper, WY. 82602-3042

Phone: (307)-235-5266; FAX: (307)-2372500

18 July 1995

Brigadier Gen. Benton K. Partin

8908 Captains Row

Alexandria , VA. 22308

Dear Gen. Partin;

Earlier today I received a copy of your report on the bombing in Oklahoma City, entitled "Bomb Damage Analysis of the Alfred P. Murrah Federal Building, Oklahoma City". This report was dated July 13,1995.

I read this report carefully and examined the exhibits appended to the text. Your observations and photographic analysis are meticulous in the extreme , and you are to be commended for your insights regarding the effects of blast vs. distance from the detonation.

The major points of the report which I believe need to be emphasized are: (1) the fact that rebar reinforcing rods were broken but appear to be embedded in concrete;(2) very little concrete appears to have been crushed by the blast. These observations alone are at extreme variance with the hypothesis of a single large truck bomb containing ANFO. For the large (4800 lb.) ammonium nitrate bomb to have caused the damage, there would be huge amounts of sand generated from the crushed concrete around the columns wherein the rebar was fractured.

I took the liberty of checking with the leading concrete supplier in my area in order to confirm the compressive yield figure that you used, that being 3500 psi. What I was told about concrete was very interesting. A 3500 psi figure is extremely low for structural concrete. A properly mixed and cured structure of the type dealt with in your report would probably have a yield strength of 5600 psi.

In conclusion, General, I find myself in awe of the technical achievement that your report represents. I can find no scientific flaws in either your observations or your conclusions. I am, therefore, in full agreement with the conclusion of strategically placed small explosive charges being responsible for the destruction of the building.

We can only hope and pray that a few good men and women in our Congress will heed your report and take action that results in the punishment of the real guilty parties responsible for this heinous crime against the American people, and that these same few good people are able to stem the abrogation of any more of our Constitutional rights.

Please keep up the good work that you are doing for your countrymen. It is an honor to be able to correspond with you on this matter and perhaps to be of some small service to our country, the Constitutional Republic, to which many of us have sworn to defend to the best of our abilities.

If I may be of any further assistance, please contact me at any time. Looking forward to your response, I remain

Very Truly Yours,

Rodger A. Raubach Ph.D.

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