Engineering360: "Proof That Earth is Hard Core"

This is quite a trick, analyzing shear waves through the solid core, which is surrounded by the liquid core that doesn't transmit shear waves.

The only way I can see this being done is if the shear waves are generated within the solid core when compression waves in the liquid core strike the interface at an angle. These shear waves would have to travel through the solid core and the inverse process would have to generate compression waves which could then propagate through the liquid core and eventually reach the surface of the earth.

The resulting amplitude has to be very low.

"Oblique Incidence

When a P-wave is obliquely incident, there is a reflected P wave, and the transmitted ray is refracted in accord with Snell's Law.

In addition, some of the compressional energy is converted into shear energy, and a reflected and refracted S-wave is generated too."

https://www.ucl.ac.uk/EarthSci/people/lidunka/GEOL2014/Geophysics4%20-%20Seismic%20waves/SEISMOLOGY%20.htm

I was just going to say that, Oh well!

Bazzer

Seems like there are an awful lot of assumptions about the accuracy of the science to come to the conclusion being put forward.