tyb
>>12183333 (lb)
The 10:10 on (almost) all watches, when advertised or shown, is quite a famous observation, and searching the web for it gives many stories and/or poss. explanations
Here's just one page:
https://www.ethoswatches.com/the-watch-guide/10-10-myths-realities-behind-time-watches/
>analysis on recorded blast sounds?
Not aware of any, so far.
To do it accurately (recognize echoes and other effects), I'd think one would need a number of audio records from adjacent locations with accurate timestamps and positions.
Some cities have gun blast location systems installed, like ShotSpotter – Nashville doesn't as far as I could find.
e.g. https://www.shotspotter.com/cities/
My guess is that air traffic shutdown (via NOTAM) was probably done as a routine measure in those cases (poss. of terrorism, other bombs etc).
Bugs me quite a bit too that there's not much to do more about it to get some accurate analysis.