  We consider the semilinear wave equation $$\partial_t^2 u -\Delta u =f(u),
\quad (x,t)\in \mathbb{R}^N\times [0,T),\qquad (1)$$
  with $f(u)=|u|^{p-1}u\log^a (2+u^2)$, where $p>1$ and $a\in \mathbb{R}$. We
show an upper bound for any blow-up solution of (1). Then, in the one space
dimensional case, using this estimate and the logarithmic property, we prove
that the exact blow-up rate of any singular solution of (1) is given by the ODE
solution associated with $(1)$, namely $u'' =|u|^{p-1}u\log^a (2+u^2)$ Unlike
the pure power case ($g(u)=|u|^{p-1}u$) the difficulties here are due to the
fact that equation (1) is not scale invariant.
