Uberwaltz thats the one I was going to post. Thank you!
All of this was predicted by Zoeppritz in 1907..it has to do with seismic waves that travel thru the Earth...but also thru all materials.
Vinyl and speaker cones of any type. Your audio room, musical instruments of different materials and shapes.
So if in the the 50 minute video the vibrational energy was to travel the flat plane and intersect a paper label or the outer edge of the record the energy would be reflected back towards the stylus and become a part of the intended signal..it would become a part of the signal. Not in phase..but it would now have many different phase components because of material type and all boundary interfaces..
When an incident P-wave strikes the boundary (or interface) between two media obliquely, the wave is split into reflected and refracted P-wave components and reflected and refracted S-wave components. The reflection and transmission coefficients vary as a function of the angle of incidence (hence, of source-receiver offset) and of the media's elastic properties, which comprise densities and bulk and shear moduli. The Zoeppritz equations (Chapter 1) give the reflection and transmission coefficients for plane waves, as a function of the angle of incidence and as a function of the three independent elastic parameters on each side of the reflecting interface. If the reflection amplitude is observed as a function of the angle of incidence, the variation of that parameter can be used to make inferences about the elastic parameters. Tom
Permalink: https://doi.org/10.1190/1.9781560803201.ch4
