Here's a link to the blast radius calculator. You have to enter the latitude and longitude in decimal form. I used 40.64056,-72.63944 for the location of the plane crash. The Nagasaki bomb looks like a tiny circle 10 miles off the coast. I think that it would have really rocked that P-3, though...
http://meyerweb.com/eric/tools/gmap/hydesim.html
http://meyerweb.com/eric/tools/gmap/hydesim.html
