2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/165093The quality of earthquake prediction is usually characterized by a two-dimensional diagram 'n' vs. 'tau', where 'n' is the rate of failures-to-predict and 'tau' is a characteristic of space- time alarm. Unlike the time prediction case, the quantity 'tau' is not defined uniquely, so that the properties of the (n,tau) diagram require a theoretical analysis, which is the main goal of the present study. This note is based on a recent paper by Molchan and Keilis-Borok in GJI, 173 (2008), 1012-1017.22 pages, 2 figuresGeophysicsOther Condensed MatterData Analysis, Statistics and Probabilitytext