Fig. 2.
From: Next-day earthquake forecasts for the Japan region generated by the ETAS model
(a) Epicenter map of the shallow earthquakes (MJ = 4.0 and depth = 100, 1 January 1926 to 22 September 2003) from the JMA catalog; (b) a space-time plot of latitudes against occurrence times, and (c) a space-time plot of occurrence times against longitudes. The polygon in (a) represents the target region used in the likelihood computation, and the dark dots and gray dots represent the target events and complementary events, respectively.