vibrations

He descends a nearby hill, rests his neck on the nearest fence and chews at the air as though the singing vibrations were made of hay.

AP Sensing says that it can pick up vibrations hundreds of metres away but "usually not several kilometres away".

One resident, who did not wish to be named, said the vibrations killed the bees in his hives.

And some locals say they are being kept awake by noise and vibrations from the electric fans used around the clock to keep the dome inflated.

“These are vibrations that are going on in the earth all the time from all sorts of different sources.”