Map the seismic ripples of the 2011 Japan earthquake

In 2011, Japan was struck by a massive undersea earthquake and accompanying tsunami. Alex Kerin's visualization shows the seismic activity over the week around the quake. The bigger dots indicate stronger quakes and the redder dots highlight deeper quakes. The histogram on the sidebar is of particular interest. It shows that there were more than 10 quakes that registered higher than 6.0 on the Richter scale.