Since March 11, I've been watching the global seismicity. Here is a map of the events with magnitude 5.0 or larger as captured from the USGS web pages:
http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/quakes_big.php
Plate margins are shown in green, and events in the vicinity of Tohoku are shown in red. Starting about 5 days before the 2011 Tohoku earthquake, there are over 450 events on this plot.
The plot below shows the cumulative numbers of earthquakes and the cumulative number in the Japan region. Aftershocks of the Tohoku earthquake are dominating the cumulative plot, but they are slowing down in numbers.
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