  We study the effects of the topology on the Olami-Feder-Christensen (OFC)
model, an earthquake model of self-organized criticality. In particular, we
consider a 2D square lattice and a random rewiring procedure with a parameter
$0<p<1$ that allows to tune the interaction graph, in a continuous way, from
the initial local connectivity to a random graph. The main result is that the
OFC model on a small-world topology exhibits self-organized criticality deep
within the non-conservative regime, contrary to what happens in the
nearest-neighbors model. The probability distribution for avalanche size obeys
finite size scaling, with universal critical exponents in a wide range of
values of the rewiring probability $p$. The pdf's cutoff can be fitted by a
stretched exponential function with the stretching exponent approaching unity
within the small-world region.
