Now THAT is impressive!
I found on a USAF fact sheet that the change in pressure caused by sonic boom is only a few pounds per square foot, about the same pressure change we experience on an elevator as it descends two or three floors, in a much shorter time period.
Anyone interested in reading that fact sheet here's the link...
http://www.af.mil/news/factsheets/Sonic_Boom.html
T.B