These "trumpet" noises started getting attention in 2015, though they were around before. https://www.sandiegouniontribune.com/opinion/the-conversation/sdut-mysterious-noises-sky-worldwide-2015may19-htmlstory.htm I think I have heard this myself and wondered if a train had crashed, but it was only one crash or roar and that was it.

Other strange noises the earth makes are its constant subliminal hum and other barely audible or sometimes really loud hums. If you think about it, this is quite reasonable, since the earth and its parts are always moving, cracking, exploding, and sloshing, and every movement of the atmosphere, the oceans, the magma, the earth, will cause pressure changes and vibration, some of which we can hear. Many examples: https://www.bing.com/videos/search?q=strange+trumpet+noises&docid=607999174645516101&mid=3193ED81672E2D650B5F3193ED81672E2D650B5F&view=detail&FORM=VIRE some of which have explanations.