This is a picture of the great divide west of etherington creek taken about 5 km's west of the parking lot. I think the mountains are Mt Farquar, Mt McGilvary, Mt Strachen and Mt Knowles. But don't quote me on that.
I'm quite sure I'm not crazy because today I had another person with me and she heard it too...a very large explosion coming from the area between the photo and the mountains behind. I've heard the same explosion here before...3 times during winter and 4 other times including today. I thought it was an avalanche during winter. But it certainly isn't that. It's a good five seconds of rumbling.
Any idea what it is?