Oswald took 10.2 seconds to fire all three shots.

[Brian Roselle]

Brian u are usually good at logic/science, apart from your decision to engage with some of the morons on this forum.
But your comment means that u/me/we/us cant hear an/any/all explosions.

In other words, there is no such thing as a shock wave.
What we have is sound. And if the leading edge of the sound is powerfull then we might call it a shock wave.
So, at what distance duzz a shockwave stop being a shockwave.
Answer, there is no answer, koz there is no such thing as a shockwave, its just sound.
Trump got a bloody ear from a shockwave, a  nearmiss, lucky.

I don’t know if I can answer your question but I will take a stab.

I think you can consider the shock wave a wave front, and made from sound waves. It is different than the spherical expanding muzzle blast wave front and is more linear as being a continual summation of sounds as the bullet travels. Imagine the bullet continually giving off spherically expanding sounds that are continuously added up to make the shock wave front.

I guess practically speaking the shock wave is no longer a wave when it fully dissipates, and too weak to detect or hear.

My guess on how it dissipates is only a guess, as I have not seen a definitive explanation. Basically, I would guess the wavefront dissipates as 1/R distance from the trajectory that formed it. Again, this just a guess, but looking at an individual sound point source, like the muzzle blast, those dissipate as 1/R^2. This is based on surface area of its expanding sphere (4*Pi*R^2). The shock wave, as effectively a composite of point source sounds, would be related to adding up point sources. So constantly adding them up is like integrating them. The integral of the 1/R^2 function becomes a form like 1/R. This would be my guess as to the dissipation rate of the shock wave, as 1/R where R the distance from the bullet trajectory forming it.
Again, this is some speculation, so you should look it up to confirm what the answer may be.

 P.S. I think they are derived from sounds and are real. Charles mentioned being able to feel normal expanding loud sounds, like muzzle blasts and rocket engines. In the case of a shock wave, if the shock wave is strong enough, it also can be felt. When I was a kid in the early 60’s and lived not far from Offout Airforce base and SAC headquarters around the fall 1962, there were a lot of big jets flying around and for some reason many sonic booms. I definitely felt those shock waves.

[Charles Collins]

Thunder is a sonic boom. A sonic boom is a shock wave created when an object moves faster than the speed of sound. Thunder is a sonic boom caused by lightning, which heats the air around it to extremely high temperatures.

Explanation
Lightning
Lightning can reach temperatures of 54,000°F, which is five times hotter than the surface of the sun.
Air expansion
The sudden increase in temperature causes the air to expand rapidly, creating a shock wave.
Shock wave
The shock wave travels along the lightning bolt, creating millions of sonic booms.
Sound
The sound of thunder is a combination of these sonic booms, which we hear as a rumble or a loud bang.
Distance
Thunder from a nearby lightning strike sounds like a sharp crack or loud bang, while thunder from a distant strike sounds like a continuous rumble.
Sonic booms can also be created by aircraft that travel faster than the speed of sound. This is known as "breaking the sound barrier".

[Brian Roselle]

Thunder is a sonic boom. A sonic boom is a shock wave created when an object moves faster than the speed of sound. Thunder is a sonic boom caused by lightning, which heats the air around it to extremely high temperatures.

Explanation
Lightning
Lightning can reach temperatures of 54,000°F, which is five times hotter than the surface of the sun.
Air expansion
The sudden increase in temperature causes the air to expand rapidly, creating a shock wave.
Shock wave
The shock wave travels along the lightning bolt, creating millions of sonic booms.
Sound
The sound of thunder is a combination of these sonic booms, which we hear as a rumble or a loud bang.
Distance
Thunder from a nearby lightning strike sounds like a sharp crack or loud bang, while thunder from a distant strike sounds like a continuous rumble.
Sonic booms can also be created by aircraft that travel faster than the speed of sound. This is known as "breaking the sound barrier".

Good reference and it reminds me of another thing I also didn't mention in my reply is the shock wave that atomic explosions generate. Although its commonly called a shock wave, I think it is different because of its spherical expansion characteristics. It appears it can be called an incident blast wave that is also called a shock wave that occurs when a point explosive detonates, releasing energy and compressing the surrounding air. The blast wave expands outward from the explosion in a spherical shape. I think this is what was seen on some of those old nuclear explosion films.

The nomenclature I was focusing on was for bullet shock waves, different from those nuclear explosion shock waves.

[Zeon Mason]

So when exactly did Wiegman HEAR the 1st shot? If Weigmans not in the  zone of the sound pressure (shock) wave then maybe he just felt wind which was gusting up to 20mph at times that day.

[Tom Graves]

So when exactly did Wiegman HEAR the 1st shot? If Weigmans not in the  zone of the sound pressure (shock) wave then maybe he just felt wind which was gusting up to 20mph at times that day.

Has Wiegman just heard the first shot, the second shot, or the third shot when, still in the car, he starts panning his camera back to the right (with a lot of blur) and everyone is looking intently down Elm except for one of the two guys who's wearing light-colored work clothes and who's looking back towards the TSBD (see 1:04 in the film)?

[Charles Collins]

Has Wiegman just heard the first shot, the second shot, or the third shot when, still in the car, he starts panning his camera back to the right (with a lot of blur) and everyone is looking intently down Elm except for one of the two guys who's wearing light-colored work clothes and who's looking back towards the TSBD (see 1:04 in the film)?

According to Dale Myers’ film synchronization Wiegman began filming at Z259 which is 2.95 seconds before the shot at Z313.

[Tom Graves]

According to Dale Myers’ film synchronization Wiegman began filming at Z259 which is 2.95 seconds before the shot at Z313.

If that's the case, then Wiegman, still in the car, must have started panning back to his right in response to the third shot.