fighter jet sound amplitude vs airbourne and groundbourne decibels sound

I'm an architect.

About 4yrs ago i did some work on a UK ...installation, a new flight-planning building, sat right on the flightline, with 30 helicopter parking spots on the concrete pan all around right damn close. - about as close as you can pack circles of rotor+2m max.

One of the fun aspects of the job was getting my acoustician to measure a few at 10,30,100m - the pilots were game too - so couple of different types at idle, idle throttle up , hover 5m, hover turn left/turn right, typ flare & landing etc. Quite a fun morning.

What I will say is -the bass response and flatness in SPL even way out at 100m was deeply impressive... we wanted the data as part of building envelope design.

(As a result it's arguable we did too good a job on the envelope and glazing though - easily met/exceeded Employers' Reqts; but flight staff were so surprised they couldn't hear what was going on' Er, yes you could, but it was easy to do >20-30dB better isolation than they'd been used to... and some, likely didn't hear so well any longer either...)

EDIT: c. a year later, I was fortunate to be on site when the Vulcan left on its last flight out; everyone was on the yellow line that day/ business rearranged around it. It was a full-chat takeoff and 270-degree rather low-level go-around as a final farewell, from a place they had once been operationally based; that was spectacular, and far more impressive than the last 'display ' flight had been on the Air Day the week previous. Majestic, loud enough you got that 'intermod' ripping sound in the ears apart from teh phsyical thump. also, car alarms set off in a very, very wide radius...
 
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Cool! It's funny about artifacts - we get used to them and think somethings wrong when they disappear. "I can't hear it."

Helicopters can be heard sooo far away. This bass is deeply impressive, as you say.