Before I begin, I did a search and while there's threads on loud booms, there's none for the recent one in Adelaide, SA.
As I've never posted a thread before, based on the search results which showed several other threads from America on 'loud booms' being in this
section, I assume this is the correct section. If not, apologies.
So let me begin now..
Yesterday, Sunday 11th January 2015, I was in the toilet doing some filing(aussie joke), when I heard some loud booms. At first I thought what the
hell, then it kind of sounded like a large aircraft, 747 or something, but then the booms continued probably for about 10 minutes. Some booms were
single, some were multiple one after the other. This was around between 3 and 4.30 in the afternoon. I don't remember the exact time as I didn't
think much of the noises beyond the moments I heard them, and I don't keep a record of when I have bowel movements.
The biggest scheduled aircraft that land at Adelaide International Airport are Boeing 777's, and you don't hear loud booms for ten minutes when they
land or take off all across the metropolitan area. You might hear a loud roar occassionally, depending on which flight path they use, but I've never
heard anything like what I heard yesterday afternoon, and I've lived near the airport and flight paths all my life.
Although I'm no expert, perhaps with the strange weather events we've been having there was some sort of atmospheric anomaly which caused these boom
sounds, mixed with a 777 landing or taking off. But again I'm not an expert so I'm only taking a very wild and uneducated guess with that.
Perhaps there was one or more RAAF C17's flying about RAAF Edinburgh base? Thing with that though is I've seen them flying around from a
distance(from where I live), and I couldn't hear a thing from that far away. We don't even hear the FA18's which occasionally call into the base
out my way. I know people who live out that way near RAAF base Edinburgh, and a fighter jet has an obvious distinct sound. Wasn't what I heard. And
I've worked in environments where P3 Orions, which the RAAF fleet is based at Endinburgh, are flying over head all day or all night, and again Orions
weren't what I heard.
I didn't think much of it, obviously as I'm posting this the day after. I totally forgot about it until I came across a thread on Reddit talking
about it this afternoon.
Some suggested it was a fireworks display at a new housing development, however from the locations some people said they were at when they heard the
booms, there's no possible way to hear the fireworks simply because the distance is too great. And it wasn't a fireworks display such as the one you
see in Sydney every New Years Eve, but a much, much smaller one.
Recently we've had some extreme weather here in South Australia and Adelaide. From extreme heat and a bush fire emergency, to record rainfall a week
later and flooding in the outback and thunderstorms. So naturally one of my thoughts while I was doing some filing in the office(aussie joke see
above), was "it's probably thunder mehh".
Yesterday evening I went down to the southern suburbs, over 40 minutes away from my location to catch up with some friends and have a few beers over a
bbq. They live in the southern suburbs of Adelaide, and we caught up at one friends house(obviously). Sure enough, they heard the same booms around
the same time.
My next thought on this today while reading the Reddit thread, was perhaps we had another earth tremor?
In recent years Adelaide has had a few earth tremors which have caused a very noticeable boom sound across the metropolitan area and beyond.
According to a local government website, the last earthquake or tremor in South Australia was on Wednesday January the 7th.
07 January 2015 19:46 -31.909° 138.759° 32 km E of Hawker 2.4
That's about 340km north-north east of the Adelaide city center. Even if that tremor happened yesterday, at 2.4 we would not even feel anything let
alone hear it.
So anyone got any ideas?