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At about 0520 this morning there was a very loud 'boom' noise over Crawley Down.In response, Nicholas Butler said:
I live 10 minutes away from Gatwick airport but it didn't sound like anything from there. I also live right next to the motorway, is everything ok there??? It sounded like a sound from a sci fi film or something. Looking it up there are sounds from electro magnetic pulses like that but I just wondered if anyone else had any ideas?
I heard these sounds earlier this it was around 1am similar to that experienced here: http://www.youtube.com/watch?v=amSpXvyPRrgBeing in close proximity to Gatwick Airport, one possible cause could be that of sonic booms from aircraft. But as Mr Butler explains:
I grew up on and around Airfields a sonic boom sounds like this http://www.youtube.com/watch?v=rMc9t8U-oC0 everything from a Dash 8 to a Tu-95 as aircraft with propellers go sounded nothing like that vibrant hum.

Comment: See also: What are they? Rumblings, 'booms' heard anew in parts of Washington
Loud boom remains a North Whidbey mystery