I had to google what ELF was.ELF is what the Navy uses for communication, and also what HAARP uses. And yes, there is more than one HAARP and yes, they are still active.
There has also been speculation that there may be ELF coming from the mantle of the Earth right now or some sort of vibrations at the least. The core is doing strange things at the moment.
Let’s hope this link is good Extremely low frequency - Wikipedia