# Acoustic vs. seismic waveforms

1. May 5, 2006

### Orion1

Is it possible to correlate the atmospheric acoustic vs. ground seismic waveforms from a charge detonation?

Are there any physicists on this forum that recognise the acoustic and seismic waveform signatures from a charge detonation?

Acoustic, Seismic wave function equation:
$$\psi (x,t) = A \sin (\omega t - k x)$$

Acoustic, Seismic wave equation:
$$\nabla^2 \phi = \frac{1}{v^2} \frac{\partial^2 \phi}{\partial t^2}$$

Reference:
http://www.911review.com/errors/wtc/imgs/wtc1level.jpg
http://www.911eyewitness.com/images/wtc1summary01.jpg
http://uscrisis.lege.net/911/911seismic.gif

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• ###### wtc1level.jpg
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2. May 5, 2006

### Mk

Why do you always post in blue?

3. May 5, 2006

### FredGarvin

In what way are you looking to correlate them?

4. May 5, 2006

### Orion1

To measure the properties of the energy source(s).

En absentia of the raw computer data source information, the attachment is my first attempt at a classical approach at correlating the acoustic amplitudes with the seismic amplitudes properties.

Is there a correlation?

When a building implodes, does it collapse into its negative amplitude spike corresponding to a vacuum pressure after the previous positive energy amplitude spike resposible for the primary implosion initiation?

In simpler terms, do buildings implode under vacuum pressure?

Last edited by a moderator: May 8, 2006
5. May 6, 2006

### FredGarvin

Honestly I don't think you'd be able to do it without the original source data. However, I would pass you along to someone who I have seen do work in this area. You should try to get a hold of Tom Irvine over at VibrationData.com. I have seen him do seismic analysis on manmade events like this before. He does sometime post in the Vibration section of Engineering Tips.com as well.

6. May 8, 2006

### Orion1

seismic chronology...

I believe that I have found a solution to the seismic-acoustic chronological timeline.

The attachment is my second attempt using zero-time chronology.

EDT = UTC - 4:00:00

Seismic:
One World Trade Center collapses:
14:28:?? UTC
10:28:35.714 A.M. EDT

duration = 40 s - data start to data end

Acoustic:
duration = 31.19 s - peak 1 to peak 6a

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7. May 9, 2006

### Orion1

Seismic Stereo...

Why are seismic waves recorded in mono instead of stereo?