Fig. 5.From: Outline of the 2011 off the Pacific coast of Tohoku Earthquake (Mw 9.0) —Seismicity: foreshocks, mainshock, aftershocks, and induced activity—(a) Epicentral distribution in and around Japan at a depth d 60-km from Jan. 1, 2011 to Mar. 31, 2011. Red symbols indicate events that occurred after 14:46 on Mar. 11, 2011. (b–s) Plots of magnitude and cumulative numbers of events versus time within each ellipse in (a). Broken lines indicate the origin time of the MW 9.0 mainshock. The starting time of induced seismicity and the origin time of an event with a maximum magnitude are shown in each panel. Note that hypocenter determination processing by JMA cannot keep up with quasi-real time processing (as of 2011/03/31) because too many aftershocks and induced earthquakes occurred. Therefore, for example, sparse seismicity in regions 5, 7, 8, 9, 12, 13 and 14 to be seen in almost the same timing after the MW 9.0 mainshock is not natural but artificial.Back to article page