This video was made very quickly and could use some work. I post it here in case you find it interesting. I suggest you watch it full-screen, in high definition with scaling off.
The animation depicts two and half months of 2011 USGS earthquake data. Blue circles represent deep seismic activity recordings (>= 40km deep). Red circles represent shallow seismic events (<40km deep). Each event leaves behind a red dot to show the overall pattern. The animation ends the day after the 8.9 quake that hit Japan on March 11 and includes the shallow 6.3 Christchurch quake.
I am keen to spend some time improving this animation. Perhaps I will find some time in the coming weeks. I intend to release the programming code as an open source project – I would love to see the community build on this stuff.