Introductory and easy book on wave propagation in solids

[Lucifer12]

Hi,

I'm trying to see the effect of indentation on wave propagation through an elastic medium as shown in the figure.

So i'm kind of a noob on this subject so would like an introductory book of some sort to study what happens on those particular positions where the indenations are.

 

[Erik Panos Kostson]

The book from K.F. Graff is a classic one ('wave motion in elastic solids')