Hello all, - first of all sorry for my bad english, it's not my mother tong. - I write here because I want to understand that are the surface waves and how can we demonstrate their existance ? Do you have a PDF file which speak about this ? - For volumic waves I have seen a mathematical demonstration in the mechanical book and I understand what is a compressive and a shear wave and that is their velocities. - For a surface wave I don't understand how we can demonstrate their existance and that is their velocity ? To conclude, my question is : do you have a PDF (or website) where I can find the mathematical development linked to the Rayleigh, Lamb and Love waves ? Thanks you so much !