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chez_jay
Today we were walking in Saltash, Cornwall and felt a vibration lasting 5 seconds, then a gap of 10 seconds, then another vibration etc. repeating the sequence about 20 times. Followed by a gap of 5 or so minutes, then the cycle repeated.
It seemed to come from the north west but Google maps suggested nothing much up there apart from an electrical substation. Certainly nothing else big and industrial. It made our feet feel like we had pins and needles. There are no major groundworks in the area I'm aware of.
It was powerful enough to make a loud noise almost like a deep ships horn. But there were no ships of any size in the Tamar according to marine traffic. That would have been south east/the opposite direction to the sound (though appreciate echo/reflection etc).
What was it?