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| | | | --- | --- | | Red Rock Eater Digest | Most Recent Article: Wed, 4 Oct 2000 |
USGS Says Only One OK City Bomb (fwd)
``` [Of course, everyone knows that FEMA and USGS are part of the conspiracy. Heck, they probably even do the logistics for the UN's black helicopters. But perhaps this is of some interest anyway.]
Date: Mon, 5 Jun 1995 06:01:11 -0400 (EDT)
From: "Marc W. Wolfson"
usgs-URGENT-NEWS-RELEASE 06-01 URGENT NEWS RELEASE
FROM: U.S. Geological Survey, Western Region
SEISMIC RECORDS SUPPORT ONE-BOMB THEORY IN OKLAHOMA CITY BOMBING
MENLO PARK -- The bomb that destroyed the Alfred P. Murrah Federal 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 19 seismic recording by producing two trains of seismic waves that were recorded on seismometers near Norman Okla.
"Seismic recordings from the building's explosion 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.
Seismic waves from the April 19 bombing were recorded at two seismograph stations; one in Norman Okla., and another at the Omniplex Science Museum in Oklahoma City. The stations are approximately 16 and four miles, respectively, from the Federal Building in downtown Oklahoma City. The Norman station is contained by the Oklahoma Geological Survey and the station is maintained by the museum.
In addition to these two stations, four portable seismographs were put in place for the May 23 implosion. One of these additional instruments was located about 300 feet from the bombed-out front of the building, and another was located near the town of Moore, about 7.5 miles from the Federal Building. The other two were set beside the permanent instruments at the Norman and Omniplex Science Museum locations.
Holzer said the OGS seismograph at Norman recorded three wave trains following the April 19 bombing; a high-frequency train of seismic waves followed by two separate and lower-frequency wave trains that were about 10 seconds apart. Following the bombing, some explanations of the multiple wave trains lead to speculation that there may have been two separate explosions, about 10 seconds apart.
The USGS, in cooperation with the OGS, initiated a comprehensive scientific investigation to evaluate the April 19, Norman seismographic recording. When it was determined that the safest way to complete demolition of the Federal Building was by controlled detonation, or implosion, scientists from both agencies record the opportunity to record that demolition and compare the event's seismic record with that of the April 19 explosion.
"By comparing the April 19 and May 23 seismic records, it appears that the high-frequency waves at the beginning of the April 19, Norman record are the body waves, arriving from the bombing, and that the two later wave trains are primarily groups or packets of surface waves generated by the bombing," Holzer said. Holzer explained that "body" waves travel through the earth, while "surface" waves travel along the Earth's surface. The speeds of the seismic waves that we infer from the record are consistent with our knowledge of other measurements of seismic-wave velocities in central Oklahoma, and the later wave trains were consistent with the surface waves that were recorded during the controlled demolition."
OGS Director, Dr. Charles Mankin said he is pleased with the work performed by Dr. Holzer and his USGS colleagues in the analysis of the seismic records obtained during the demolition of the Federal Building. "This information, together with data from industry sources, has enabled us to develop a velocity model for the crust in central Oklahoma," Mankin said. "We believe this model is an integral part of the eventual resolution of the seismic records obtained during the bombing of the Murrah Federal Building in Oklahoma City."
FOR MORE INFORMATION: Editors: Interviews with Dr. Holzer may be obtained by calling the USGS Public Affairs Office in Menlo Park, Calif., at 415-329-4000. Interviews with Dr. Mankin may be obtained by calling the OGS at 405-325-3031. ```
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