[en] The distribution of strain-induced magnetization directions around a non-implanted disc in an ion-implanted ferrimagnetic garnet epilayer supporting bubbles is derived from the elastic model developed by the author. It is shown that when an in-plane field is applied along a direction close to an in-plane easy-axis, the depth-dependent morphology of charged walls varies strongly with the relative magnitudes of the magnetostriction constants. For λ₁₀₀ = λ₁₁₁ (λ₁₁₁ < 0), the largest charged-wall jump (flip) is expected to occur at the interface between implanted and non-implanted thicknesses. For λ₁₀₀ = -1/2λ₁₁₁, the negative shear strain is demonstrated to favour charged walls pivoting around the in-plane easy-axis in the interface region. A switching mechanism is proposed which explains charged-wall rearrangement at the surface during flip when λ₁₀₀ is positive. (author)