Isn't this in the wrong NG??

Jim.


"Weatherlawyer" wrote in message
ps.com...
The C4 documantary about Krakatau states that the sound of the
explosion travelled around the earth 7 times. (Is that 3 1/2 times in
each direction BTW?)

Anyway, since we know that audible sound -even at those fairly low
frequencies, can not travel anywhere like that distance in normal
conditions. Any suggestions how it was conducted?