Fascinating video graphic of Japanese earthquakes 1/1-10/15, 2011

This video (stored on YouTube) shows the occurances of Japanese earthquakes of magnitude greater than 3 using cirlcles whose diameter is related to intensity with a line illustrating the depth. The magnitude is also indicated on the audio, so use speakers if possible. Thanks to the reporting on Japundit on this interesting occurance. You can also see reporting on earthquakes at the US Geological Service web site. The introductory text is in Japanese, but you can guess the meaning.