Several procedures for the statistical estimation of the regioncharacteristic
maximum possible earthquake magnitude, mmax , are currently
available. This paper aims to introduce and compare the 12 existing
procedures. For each of the procedures given, there are notes on its
origin, assumptions made in its derivation, condition for validity, weak
and strong points, etc. The applicability of each particular procedure is
determined by the assumptions of the model and/or the available information
on seismicity of the area.