The Jumping Jack Flash blog (translation) made a Google Earth kml file (download) that creates an animation of the swarm of earthquakes that occurred around Japan between 6 March and 13 March 2011.
A quite well done video has been made of the animation, adding music and sound effects. 1 second in the video is equivalent to 1 hour. The animation starts on 9 March since the period between 6 March and 9 March was relatively quiet, seismically, around Japan. I recommend watching the video in full screen HD so that the dateline in the top left corner is readable.