[Elfsea] Update on infrasound signals from the Columbia]

sharon sharon at polkawitch.com
Tue Feb 11 01:03:45 PST 2003


hey sluggy,
thanks for these postings. I do appreciate it.

vivaine
----- Original Message -----
From: "Sluggy" <slugmusk at linuxlegend.com>
To: "lr" <loch-ruadh at ansteorra.org>; "ES list" <elfsea at ansteorra.org>
Sent: Friday, February 07, 2003 10:58 PM
Subject: [Elfsea] Update on infrasound signals from the Columbia]


> Hello again!
>
> My friend at SMU has updated his page about the seismographic info from
> the Columbia explosion. Here is his email to the robotics club list....
>
> Sluggy!
>
> -------- Original Message --------
> Subject: [DPRG] Update on infrasound signals from the Columbia
> Date: Mon, 10 Feb 2003 17:55:20 -0600 (CST)
> From: "David P. Anderson" <dpa at io.isem.smu.edu>
> To: dprglist at dprg.org
>
> Howdy
>
> New analysis of the infrasound signals recorded by SMU of
> the breakup of the space shuttle Columbia:
>
> http://www.geology.smu.edu/~dpa-www/columbia/update.html
>
> The seismologists have determined that the multiple peaks
> recorded over 12 minutes are in fact "multi-path" signals,
> echos if you will, of a single explosion which occurred
> at 13:59.4 GMT a few kilometers west and north of Lubbock,
> Texas.  That is the same time at which NASA lost telemetry.
>
> Simulations of the infrasound signal of a 1 kT explosion
> at 1175 kilometers distance done by the Los Alamos National
> Laboratory look remarkably like the signals picked up at
> Lajitas, and include multiple "echos", refractions really,
> from the stratosphere and thermosphere.  Seismologists
> estimate the Columbia explosion to be a decompression event
> with the force equivalent of 20 to 50 pounds of TNT.
>
> This is what might be expected, for example, if a wing tore
> off in flight and caused a sudden "decompression" of the shuttle.
>
> Seismic recordings of the signal heard by Texas residents (recorded
> by Geotech who just happened to be testing a seismometer that
> morning) have been analyzed as a series of 'N' waves, sonic
> booms, generated by the re-entry of multiple pieces of shuttle
> fragments as the Columbia disintegrated.
>
> regards,
> dpa
>
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