This one is 6.9 miles: http://earthquake.usgs.gov/earthquakes/eventpage/usb000rs50#summary
According to wiki, the 2011 Fukushima was 19 miles deep:http://en.wikipedia.org/wiki/2011_T%C5%8Dhoku_earthquake_and_tsunami
Yep - depth has a lot to do with the effects....just yesterday we had a beentsie 3.2 about sixteen miles south of us, and it was maybe 2 or 3 miles deep — but it rumbled and then gave us a good thump.....something we don’t usually experience until the upper 4’s on the scale.