[Elfsea] Update on infrasound signals from the Columbia]

[Spence and Robin Mabry]

Sluggy,
Thank you for the information.
Four of the astronauts were clients of my company. It was a very sad day
for all of us.
HL RdS

-----Original Message-----
From: elfsea-admin at ansteorra.org [mailto:elfsea-admin at ansteorra.org] On
Behalf Of Sluggy
Sent: Friday, February 07, 2003 10:59 PM
To: lr; ES list
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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