The ability of a seismic network to detect signals of earthquakes depends on the geometry of the network, the instrumentation used and the noise present at each station. This ability is not constant, as the state of health of seismic stations and the radiation characteristics of the noise sources change in time and geometry and instrumentation of the network are not homogeneous in space. An automatic procedure to produce maps of the minimum magnitude detectable from the network (detection) was implemented, using the software PQLX to calculate the noise levels and an empirical relationship to estimate the signal amplitude of a seismic event to the stations. After the description of the automatic procedure and of the different maps that are produced, the results are compared to the...