  We present evidence for Mott quantum criticality in an anisotropic
two-dimensional system of coupled Hubbard chains at half-filling. In this
scenario emerging from variational cluster approximation and cluster dynamical
mean-field theory, the interchain hopping $t_{\perp}$ acts as a control
parameter driving the second-order critical end point $T_c$ of the
metal-insulator transition down to zero at $t_{\perp}^{c}/t\simeq 0.2$. Below
$t_{\perp}^{c}$, the volume of the hole and electron Fermi pockets of a
compensated metal vanishes continuously at the Mott transition. Above
$t_{\perp}^{c}$, the volume reduction of the pockets is cut off by a
first-order transition. We discuss the relevance of our findings to a putative
quantum critical point in layered organic conductors, whose location remains
elusive so far.
