@kincses-zsolt had the AI describe the physics of a mach cone here.
and here
The mach cone does not get any bigger when the bullet hits something and therefore does not continue flying at supersonic speed.
After the bullet stops, the sound continues to propagate, but it becomes quieter with increasing distance. Outside the Mach cone, which is formed until the bullet stops, no sonic boom can be heard anymore.
Greg:
“This smartphone recording was from fairly far back in the crowd, located about 75 meters from the line-of-fire / podium. Playing at 1/10 speed we can hear cracks & booms for most shots.
The crack for shot 6 sounds different, so perhaps that was the one that hit Corey? With the other 7 shots fired by Crooks, we hear echos of the crack, probably off the barn wall or some other reflective surface, whereas for Shot 6 we do not hear echos.”
What you perceive as a crack is not a real sonic boom, but merely the expanding sound wave.
The crack from shot 6 probably sounds different because its maximum Mach cone was significantly smaller.
It would be interesting to know where bullets 4, 5, 7, and 8 hit, but there is probably no reliable information on that. A bullet is lodged in Copernhaver. Another bullet is said to have hit the vinyl cover of the jumbotron.
However, as Zolt has already noted, the sound waves do not propagate exactly perpendicular to the maximum mach cone.
Your audio analysis was very good, but strictly speaking, you only localized the muzzle blast.
I’m interested in where the first three bullets were fired from.
That’s why I consider the area between the orange lines in the image above to be important. The expanding sound wave of the maximum mach cone should only have been audible there if the first three bullets were fired from building 9.
In the following image, it is the area between the purple lines. As you can see, the dashcam recording of a parked car could also provide the necessary data.
Unfortunately, I am not aware of any recordings from this area at this time.
Recordings from inside the maximum mach cone would of course be best.
Four police cars were in the eastern parking lot. A recording (Collins) has been released, and offtheback is convinced that it has been manipulated. One of them is known to have had its dashcam on (TRPR Mark A. Neugebauer), but the recording has not been released yet.
(Collins dashcam M500-010482, Tedeski dashcam ???, TRPR Mark A. Neugebauer (Pending) dashcam ???, The fourth car is said to have been driven by Dimmick, CEO of AGR)
On the west side were Vensel and Sasse. Both had bodycams and were probably in the area where the sound waves of the max mach cone from bullets fired from Building 9 would have been heard.
bullet speed upon impact?