  In the present paper, we consider second order strictly hyperbolic linear
operators of the form $Lu\,=\,\partial_t^2u\,-\,{\rm div}\big(A(t,x)\nabla
u\big)$, for $(t,x)\in[0,T]\times\mathbb{R}^n$. We assume the coefficients of
the matrix $A(t,x)$ to be smooth in time on $\,]0,T]\times\mathbb{R}^n$, but
rapidly oscillating when $t\to 0^+$; they match instead minimal regularity
assumptions (either Lipschitz or log-Lipschitz regularity conditions) with
respect to the space variable.
  Correspondingly, we prove well-posedness results for the Cauchy problem
related to $L$, either with no loss of derivatives (in the Lipschitz case) or
with a finite loss of derivatives, which is linearly increasing in time (in the
log-Lipschitz case).
